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Discussion Starter · #1 ·
2004 ZR5 crew cab. No brakes except for a small little bit when running (not enough to safely drive). Replace Master Cylinder and bench bled it twice. Bled lines in order, back to front with a helper. Didn’t resolve issue. Reversed bled twice, that didn’t change anything either. It appears that what little brake I have is on the rears, not the front. Vacuum appears to be working well and I can’t find any leaks. I’m open to ideas because I’m stumped.
 

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B4U Task Force Admin
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The abs may be your issue...need to activate the solenoids...might take a Tech II.


BTW...a 2004 is a 2nd gen, and this has been moved to Wheels/Tires/Brakes.
 
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Did you do some brake reapirs, or just jumped in and brake pedal to the floor?
 

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Discussion Starter · #6 ·
Perhaps wheel cylinders?
All were replaced over a month ago. I’m thinking it’s something to do with the ABS system. I can’t get it into a garage until the 25th so I’m in limbo until then unless I can figure out the problem.
 

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The best way I have found to get stubborn air out...... Put some brake fluid in a clean, see through container. Hook up a hose to the bleeder ,make sure the hose is submerged in the fluid. Open the bleeder and pump the brakes until you no longer get bubbles.
 

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Discussion Starter · #10 ·
Problem fixed after 16 hours. Pin hole right front that barely leaked but would allow air in with every stroke of the pedal.
 

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2003 GMC Sonoma SLS extended cab 4.3L auto 4x4
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Problem fixed after 16 hours. Pin hole right front that barely leaked but would allow air in with every stroke of the pedal.
Ahh, those pesky pinholes - glad you found it and got it resolved.
 
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