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99 Bravada Service AWD and ABS (Can't Be Fixed?)

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Old 08-01-2012, 02:17 AM   #1
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Thumbs down 99 Bravada Service AWD and ABS (Can't Be Fixed?)

Hello,

I just bought a nightmare 99 Bravada and I have had nothing but problems. I have replaced:

1: exhaust manifold gasket leaking needed to be replaced.

2: driver side door hinges were wasted needed all new hardware and a bit of welding.

3:trans crossmember was completely rusted through and needed to be replaced.

4: passlock system had a massive short and took 4 days in the shop to fix.

5: left front hub bearing (very questionable repair as old one looks fairly new)

6: Transfer case fluid changed to new Trak II fluid per GM TSB.

I had my ABS light come on and off several times and it would seem the ABS was not functioning even though the light would go off the brake pedal seemed very stiff almost light it was pushing against me when stopping and when I locked up the brakes on gravel I didn't feel anything in the pedal and heard no noise from the ABS and AWD light blinked several times in a short trip and I noticed when the wheel was turned while reversing or in drive I'd get a bad shutter as well as making slow turns so I brought it to a different mechanic to get a fresh perspective on this so they ran a test and pulled a failure code from th AWD and malfunction code in the speed sensor on the left driver side and was told replacing the hub assembly would fix my ABS issue and possibly the AWD. Well, after spending money I dont have it seems the ABS is working now, ( should ABS make a noise when you first start the truck and drive like the older blazers did?) but the AWD light is still blinking and shutter still present.

I'm getting married the 10th of August and this truck is killing us financially and I don't have any trust in my mechanics and I think they are the replace it and see if it fixes the issue guys and I'm dying to know what is wrong with the AWD as I cant stand driving it when the AWD is the way it is and I'm only getting 13.1mpg with tuneup. Please help me figure this out and I'll be forever in your debt.

Thank You in advance!
Old 08-01-2012, 07:11 AM   #2
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Re: 99 Bravada Service AWD and ABS (Can't Be Fixed?)

My bravadas ABS didn't make any noise unless I was locking it up, then the pedal would pulse and the brakes made a groaning sound. Have you had a gm dealer dealer diagnose it? I'm not a fan of the stealership but they occasionally get my money when its a complicated issue such as this. It shouldnt be more the $100 to $150 to check it out. Mine shutters at low speeds during turn some times also. Usually a transfer case flush takes care of this and cost about $90. I've had it done every few years.
Old 08-01-2012, 08:28 AM   #3
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Re: 99 Bravada Service AWD and ABS (Can't Be Fixed?)

I'd suggest selling the Bravada and going for a Blazer or Jimmy. I hate the Bravada. One of my friends had a 97 and I hated that thing. Always had issues. Didn't have a ton of miles either. Was like 90 soemthing.
Old 08-01-2012, 09:14 AM   #4
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Re: 99 Bravada Service AWD and ABS (Can't Be Fixed?)

Where are you located? Parting it out might be easier and you might have more people local than you think that can help you
Old 08-01-2012, 02:53 PM   #5
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Re: 99 Bravada Service AWD and ABS (Can't Be Fixed?)

I can't sell something when I'm already in the red on it and I doubt I'll part it out as it doesnt even have a 100k on it yet and the engine runs grade A it's just the AWD currently. Please folks thanks for the suggestions, but I need help with the AWD.
Old 08-01-2012, 02:54 PM   #6
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Re: 99 Bravada Service AWD and ABS (Can't Be Fixed?)

Sorry I'm from northwest Indiana
Old 08-03-2012, 12:45 PM   #7
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Re: 99 Bravada Service AWD and ABS (Can't Be Fixed?)

These can be money pits, I would get something more reliable and tinker with the bravada as a back-up car. Plus a bravada is not the wisest choice if you are concerned with fuel mileage.
Old 08-03-2012, 01:08 PM   #8
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Quote: Originally Posted by chcknugget
These can be money pits, I would get something more reliable and tinker with the bravada as a back-up car. Plus a bravada is not the wisest choice if you are concerned with fuel mileage.
I havent had a single problem with mine yet (knock on wood) and it gets 19 mpg so... yeah not true lol

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Old 08-03-2012, 01:30 PM   #9
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Re: 99 Bravada Service AWD and ABS (Can't Be Fixed?)

And I get 20mpg in my 4x4 blazer... My point is the 99 bravada was rated at 16mpg and it sounds like this vehicle was not well maintained. It is now a 13 year old vehicle that needs love. If you need a daily driver, financially it might be best to cut your losses.
Old 08-03-2012, 03:17 PM   #10
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Re: 99 Bravada Service AWD and ABS (Can't Be Fixed?)

The transfer cases can cause a shudder when the fluid is dirty and contaminated. The fluid is not cheap at all though. We used to drain the t-case and fill with autotrak fluid, then go in the parking lot and do some figure 8's. Bring it back in and change the fluid again. It got the new fluid circulating and in the clutches to flush the old junk out.

I would try driving in a figure 8 pattern for a wile then changing the fluid one more time.
Old 08-03-2012, 03:21 PM   #11
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Re: 99 Bravada Service AWD and ABS (Can't Be Fixed?)

http://www.justanswer.com/uploads/cr..._2003astro.pdf


#99-04-21-005E: Transfer Case Shudder (Flush and Replace Transfer Case Fluid) - (Nov 28, 2005)


Subject: Transfer Case Shudder (Flush and Replace Transfer Case Fluid)


Models: 1999-2005 Chevrolet Astro (AWD)

1999-2005 GMC Safari (AWD)

1999-2001 Oldsmobile Bravada

with All-Wheel Drive (NV136) Transfer Case (RPO NP4)




--------------------------------------------------------------------------------

This bulletin is being revised to update the correction information. Please discard Corporate Bulletin Number 99-04-21-005D (Section 04 -- Driveline/Axle).


--------------------------------------------------------------------------------

Condition
Some customers may comment on a vibration (shudder) during tight turning maneuvers on dry pavement at vehicle speeds less than 8 km/h (5 mph).

Cause
This condition may be caused by a slip-stick of the clutch plates in the transfer case clutch pack. On 1999 to 2002 models, the preload that is designed into the clutch pack may contribute to the condition. In addition, contamination of the fluid may interfere with the friction modifiers.

Correction
Flush and replace the transfer case fluid on affected vehicles using the following procedure and the part number listed below.

Perform the following diagnosis prior to flushing and replacing the transfer case fluid in order to properly identify the shudder.

Diagnosis
Verify the shudder in the vehicle. The vehicle needs to be at operating temperature (driven at least 8 km (5 mi) for proper diagnosis. After the vehicle is at operating temperature, drive in a tight circle just short of steering wheel lock, at a speed less than 8 km/h (5 mph) in order to identify the shudder.
Identify what rear axle type the vehicle has.
€ If the vehicle has a standard rear axle, then proceed to step 3.

€ If the vehicle has a locking rear axle, remove the front propeller shaft. Refer to the Propeller Shaft subsection in the Service Manual. Drive the vehicle as outlined in step 1.

€ If the shudder goes away, install the front propeller shaft and proceed to step 3. Refer to the Propeller Shaft subsection in the Service Manual.

€ If the shudder does not go away, the locking rear axle may be the cause. Evaluate the condition using diagnostic information in the appropriate Service Manual.

€ Install the front propeller shaft. Refer to the Propeller Shaft subsection in the Service Manual.

Flush the transfer case with the blue colored fluid (AUTO-TRAK II) using the procedure and part number listed below. Perform the flush procedure even if the transfer case contains the blue colored AUTO-TRAK II fluid in order to remove any possible contaminants. The AUTO-TRAK II fluid contains an improved friction modifier that should correct the slip-stick condition. Refer to the Transfer Case subsection in the Service Manual for information on draining and filling the transfer case.
Flush Procedure
Important: Refer to Corporate Bulletin Number 99-04-21-001, dated April 1999, for important information on removing the transfer case drain and fill plugs.

Drain the transfer case fluid.
Refill the transfer case with 2 L (2 qts) of new fluid, P/N 12378508 (Canadian P/N 10953626).
After refilling the transfer case, drive the vehicle a minimum of 8 km (5 mi).
With the transfer case at operating temperature, drain the transfer case fluid again.
Refill the transfer case with new fluid.
Important: The vehicle may require approximately 160 km (100 miles) of driving before the condition is completely corrected.

If this procedure does not correct the shudder condition, please call the Technical for further instructions and review PIP3012D or newer.
Parts Information
Part Number
Description
Qty

12378508 (Canadian P/N 10953626)
AUTO-TRAK II Transfer Case Fluid
4 (1 L) containers
Old 08-03-2012, 10:16 PM   #12
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Re: 99 Bravada Service AWD and ABS (Can't Be Fixed?)

abs light on as well? check ur wheel speed sensors. once the abs is fixed i would suggest changing fluid if it keeps giving u problems.
Old 08-03-2012, 10:34 PM   #13
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Re: 99 Bravada Service AWD and ABS (Can't Be Fixed?)

I definitely need to change my transfer case fluid then cause mine binds up a lot on tight turns especially when i turn into my driveway. But I don't have any lights on so that's good...
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