Rear brakes LOCK UP when wet? (ABS Pulsate feeling) - S-10 Forum
 
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post #1 of 42 Old 03-17-2008, 03:33 PM Thread Starter
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Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

I had asked about this 2yrs ago, and my brakes still do this.
Now its getting annoying and a little worse.

Please take a minute to read what I have here before replying.
Alot of comments on other threads are a layer of rust builds, and
that can't be the case in only a few hours time. Thanks

- This ONLY happens when its raining.
- The truck can sit for less then a few hours and it can do this as well.
- Take off, give it the brakes and the rear tires lock up.
- This is a Pulse (ABS) type lock up, NOT a solid lockup to complete stop.

It's simulating a ABS situation, where the rears pulsate, then you here the ABS module release, then its does it again, and so on until you stop or let go of the brakes.

I have seen TONS of threads on this, but nobody giving a clear answer as to what the issue is.

I see alot of, "it's normal" answers, which it may be VERY normal to these
trucks, but its far from normal..lol

Where are the ABS sensors? Only on the front wheels?

I am wondering if when our ABS sensors get wet they give off a false reading?

This brake issue only lasts a few minutes then it goes away until the next cycle of sitting for a few hours.

Thanks for any input!

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post #2 of 42 Old 04-11-2009, 01:59 PM Thread Starter
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

bump? anyone
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post #3 of 42 Old 04-11-2009, 02:27 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

I would guess its just surface rust on the drums. It doesn't take as much time to rust as you think. An hour is enough time for a thin layer. I believe the sensor for the rear wheels is located on the end of the transmission. Not sure if its the same one used for your speedo but it could be.
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post #4 of 42 Old 04-11-2009, 03:43 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

Mine are really touchy after it rains for the first stop. After that its fine. Ive learned to deal with it, but it sucks.


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post #5 of 42 Old 04-11-2009, 04:16 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

my 94 does the same thing, but my 01 does not. once you apply the brakes the first time it locks them up, ut than fine after that.

things i have done, readj the shoes, changed brake fluid, actualty swapped drums from side to side, still no fix. I have just gotten used to it. But I am sure there must be an answer somewhere.

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post #6 of 42 Old 04-11-2009, 05:51 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

Quote:
Originally Posted by GeorgesBlazah View Post
Mine are really touchy after it rains for the first stop. After that its fine. Ive learned to deal with it, but it sucks.
Mine too, my 1994 never was like that and I backed the drums below water every time I launched my boat...

Mine are the front grabbing but it might be possible to mistake that for the rear? or the front grabbing activates the ABS? Do you hear the ABS come on?
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post #7 of 42 Old 04-12-2009, 12:09 AM Thread Starter
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

Quote:
Originally Posted by GeorgesBlazah View Post
Mine are really touchy after it rains for the first stop. After that its fine. Ive learned to deal with it, but it sucks.


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Quote:
Originally Posted by Mechnix View Post
Mine too, my 1994 never was like that and I backed the drums below water every time I launched my boat...

Mine are the front grabbing but it might be possible to mistake that for the rear? or the front grabbing activates the ABS? Do you hear the ABS come on?

Seems like alot of us have been just living with it. I know I have for years now. Just sick of it. If you forget to dry the breaks out after you first get in, holy crap is it an awakening when you can't stop!!

Its definitely the rears locking up and its triggering the ABS, no light comes on but you can hear the ABS pulsate. Just sucks and annoying as hell.
My wife won't drive it for that reason alone.
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post #8 of 42 Old 04-12-2009, 04:58 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

my 91 was doing this, even after changing them. I changed them again last week but instead of getting advances cheapest set, I got the next step up. Problem solved so far.
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post #9 of 42 Old 04-13-2009, 10:23 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

my '94 is very touchy the first time you apply the brakes any time after sitting for a while no matter if its wet or dry. if i pump them before i pull out its better, though. i think it may be normal for these trucks. the early abs is absolutely horrible. i feel so much safer with mine not working now than when it was "working." any time it was wet it would activate too much and not let me stop. the only thing that makes me wonder is that mine woudnt ever change like you say yours goes away after a little bit
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post #10 of 42 Old 04-13-2009, 11:34 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

Quote:
Originally Posted by Mechnix View Post
Mine too, my 1994 never was like that and I backed the drums below water every time I launched my boat...

Mine are the front grabbing but it might be possible to mistake that for the rear? or the front grabbing activates the ABS? Do you hear the ABS come on?

My ABS deosnt engage. The brakes just grab really hard, but I know when it comes and I usally dont apply the brakes hard enough when im moving slow enough for them to act up. 5spd ftw.

I would assume though that if I would stay steady on the brake pedal when I was braking that it would engage.

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post #11 of 42 Old 04-15-2009, 09:41 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

my truck does it two on the front bad when they get wet scares me
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post #12 of 42 Old 04-16-2009, 06:06 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

My 96 s10 does this, every time its wet and when i first use the brakes they lock up! it pisses me off. But when the roads are wet or i go thru a puddle they lock up and make a odd noise, the pedle gets hard and when the truck slows or stop it gets soft? its dumb that they do it but nothing i can do.

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post #13 of 42 Old 04-16-2009, 10:26 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

Mine doesnt do it. But I did have a ford that did it every time it rained freaked me out the first time it happened


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post #14 of 42 Old 04-16-2009, 11:20 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

my 94 sonoma does it in the front bakes wet or dry and makes me go all over the road i looked up the recalls for it and turns out there was a recall on the abs
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post #15 of 42 Old 04-18-2009, 09:42 AM Thread Starter
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

Well I blew a crap load of dust out, cleaned them all up, readjusted them. Lets wait for rain now and see.
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post #16 of 42 Old 04-21-2009, 07:40 AM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

yea i have the same problem.
i just put on new front pads and rotors and bearing less then 5k ago
also cleaned and adjusted rears and this still happens
any idea?
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post #17 of 42 Old 04-21-2009, 09:09 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

I dont know how relevant it is to this thread, but I had bad rear wheel lock up on my 91, I pulled the right rear drum and it was packed with brake dust...I got some brake cleaner and cleaned them up really good and it hasnt done it since...I dont understand why there was so much brake dust in there I had good clearance between the shoes and the friction surface of the drum
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post #18 of 42 Old 04-22-2009, 09:47 AM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

yea i cleaned them too.
but i positive that its the abs kicking in when is wet out.
call the dealer no recalls. not sure but its annoying me.
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post #19 of 42 Old 04-22-2009, 04:47 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

how did your axle seals look if they are leaking the smallest drop of gear oil could cause the lock-up

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post #20 of 42 Old 04-22-2009, 05:04 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

that shit happens to me like its a complte lock up tho like i will barly apply the brakes and my rears will be locked up and it only happens when it rains it suxx


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post #21 of 42 Old 04-22-2009, 08:00 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

no leaks of anything.
my problem is the same as the first post
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post #22 of 42 Old 04-22-2009, 09:05 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

My 92 does this. Only when its raining though. Ive learned to live with it but its aggervating
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post #23 of 42 Old 04-23-2009, 11:21 AM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

its just a little rust in the drums deal with it its just when u get the front rotors wet some times they just dont work haha wet rotors
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post #24 of 42 Old 05-09-2009, 08:51 AM Thread Starter
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

Ok....its been a couple weeks since we yanked the drums off, blew them out, used brake cleaner, readjusted.

Hasn't locked up....so, I guess it WAS dust...odd, I swear I tried this before....but we seem to be good again!
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post #25 of 42 Old 06-10-2009, 12:54 AM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

what i did was just unplug the ABS dont have ABS now but i havent had problems since
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post #26 of 42 Old 06-10-2009, 08:02 AM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

my friend just did this on a tahoe yesterday. same problem with abs locking up only when wet out. he had to replace the entire hub assembly to fix the problem.

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post #27 of 42 Old 06-10-2009, 05:07 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

i have a 96 that does this. how do i go about doing away with the rear abs and keeping the front. or is this even possible. if not possilbe how do i do away the abs totaly
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post #28 of 42 Old 06-10-2009, 06:14 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

Mine has done this since the truck was brand new in 97. ABS SUCKS!!!! I cant wait to delete it when I bag the truck.
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post #29 of 42 Old 06-11-2009, 08:43 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

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i have a 96 that does this. how do i go about doing away with the rear abs and keeping the front. or is this even possible. if not possilbe how do i do away the abs totaly
I am pretty sure you either have abs on all or none. If you want to do away with it, you can take the fuse out.

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post #30 of 42 Old 06-12-2009, 02:31 AM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

Same thing happened to mine in the rain pulled the fuse out from under the hood, hasn't done it in over a year no matter what I do. rain or shine the abs light is always on but just black it out.
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post #31 of 42 Old 06-12-2009, 03:51 AM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

If you have drum brakes this is caused by the wheel cylinder rotating on the backing plate because of rust or it is worn out. My dad's 93 s10 and the two malibu's which did it, that problem was fixed by getting rid of the slop between the wheel cylinder and the backing plate.

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post #32 of 42 Old 06-15-2009, 11:32 PM Thread Starter
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

Mine do not do this anymore since we cleaned the 10lbs of dust and readjusted the brakes.
Its now been 3 months.
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post #33 of 42 Old 10-06-2009, 12:04 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

My 93 locks them up in the rear on the passenger side all the time. Dry or wet, doesnt matter. I have had the drums off a few times and there is dust that I clean out and only on the passenger side I found what looked like fibers or like skoal long cut. It sucks that I cannot stop the truck without dragging a tire half the time.
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post #34 of 42 Old 10-06-2009, 06:50 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

same thing happened with my '95 noma.

it has abs but no wheel speed sensors, its called RWAL or rear wheel anti lock.... . it uses speed sensors in the trans to detect rear wheel speed.

this only when it was raining. i replaced my drums because they were over spec and when i did, i did not adjust the shoes as tight as before, so far no problems. try adjust your shoes back some.

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post #35 of 42 Old 10-06-2009, 07:56 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

mine does it as well, but its not abs, with the slightest touch the front will lock up but after the first initial brake touch, its fine. my 98 did it as well.

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post #36 of 42 Old 10-07-2009, 07:42 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

yep my truck does this too,i'll have to try taken the drums off and cleaning the dust n crap outta there.one of my 1 ton chevys just started doin it as well...oh well winter projects i guess lol. hey man nice capri i had one that got creamed by a drunk driver and i miss the hell outta that car
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post #37 of 42 Old 09-24-2010, 12:27 AM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

Quote:
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Ok....its been a couple weeks since we yanked the drums off, blew them out, used brake cleaner, readjusted.

Hasn't locked up....so, I guess it WAS dust...odd, I swear I tried this before....but we seem to be good again!

I know its been a wile and you have fixed it but a quick question:

Does your truck have the speed sensors inside the drums? I cant remember what year GM started that.

The sensors are magnetic and attract steel filings that build up and are most likely the cause.

Just my 0.02
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post #38 of 42 Old 09-24-2010, 01:29 AM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

My 98 extended cab has done this since day one. In the rain the rears kick the abs on and it wont stop until I let off. It's bullshit and caused me to rear end somebody years ago.
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post #39 of 42 Old 09-26-2010, 08:27 AM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

i work as a mechanic at a chevy dealership the problem is the back shoes have a crack in them or they have a glaze on them u should take off the drum take a piece of ruff sand paper sand down the shoes and then take a piece of sand paper and sand the inside of the drum to knock the glaze off of it and check the drums for cracks and the shoes for cracks no matter how small the crack is it will cause this problem
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post #40 of 42 Old 09-26-2010, 08:29 AM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

and try and adjusting the back brakes this will cause the pulsating your getting from the brakes because the back brakes are wanting to push out more
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post #41 of 42 Old 07-29-2014, 06:15 PM
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

Quote:
Originally Posted by GiveMeBreak View Post
I had asked about this 2yrs ago, and my brakes still do this.
Now its getting annoying and a little worse.

Please take a minute to read what I have here before replying.
Alot of comments on other threads are a layer of rust builds, and
that can't be the case in only a few hours time. Thanks

- This ONLY happens when its raining.
- The truck can sit for less then a few hours and it can do this as well.
- Take off, give it the brakes and the rear tires lock up.
- This is a Pulse (ABS) type lock up, NOT a solid lockup to complete stop.

It's simulating a ABS situation, where the rears pulsate, then you here the ABS module release, then its does it again, and so on until you stop or let go of the brakes.

I have seen TONS of threads on this, but nobody giving a clear answer as to what the issue is.

I see alot of, "it's normal" answers, which it may be VERY normal to these
trucks, but its far from normal..lol

Where are the ABS sensors? Only on the front wheels?

I am wondering if when our ABS sensors get wet they give off a false reading?

This brake issue only lasts a few minutes then it goes away until the next cycle of sitting for a few hours.

Thanks for any input!
I have the exact same problem, In fact my Sdime has been doing It since the first day I bought her and It's been 7 years now. I recently got new breaks done all around and at the moment having nothing but problems with the rear wheels, Maybe something to do with the ABS I don't know. And like yourself I have read countless threads upon this problem yet no one seems to know how to fix it.

I also read that between 2000 and 2003 the ABS system In all GM cars and trucks were the worst years ever, Many of my friends all have the same problem as well. I did read something about the front wheel sensors getting dirty according to many people but who knows..... I personally pulled both ABS fuses out to see If that would fix this problem, So far so good other then the constant lock up on my passenger side rear wheel. My buddy says that It sounds like the adjuster Is not set up properly, Anyway I suggest you try pulling out the fuses If you haven't already done that.
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Re: Rear brakes LOCK UP when wet? (ABS Pulsate feeling)

Quote:
Originally Posted by scagssdime View Post
i have the exact same problem, in fact my sdime has been doing it since the first day i bought her and it's been 7 years now. I recently got new breaks done all around and at the moment having nothing but problems with the rear wheels, maybe something to do with the abs i don't know. And like yourself i have read countless threads upon this problem yet no one seems to know how to fix it.

I also read that between 2000 and 2003 the abs system in all gm cars and trucks were the worst years ever, many of my friends all have the same problem as well. I did read something about the front wheel sensors getting dirty according to many people but who knows..... I personally pulled both abs fuses out to see if that would fix this problem, so far so good other then the constant lock up on my passenger side rear wheel. My buddy says that it sounds like the adjuster is not set up properly, anyway i suggest you try pulling out the fuses if you haven't already done that.

03-17-2008, 12:33 pm
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