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2002 Chevy Blazer Rear Brakes

4 messages,  Last post on May 27, 2009 at 2:14 PM

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#3 of 4 2000 Blazer intermittent brake failure by armyhistorian May 27, 2009 (12:13 pm)
My wife drives a 2000 Blazer w/4WD and less than 100,000 miles. We picked up the vehicle after a NYS inspection. I drove it home, and upon reversing it into the driveway, I stepped on the brakes and had none! I rolled into a tree! I checked the brake fluid (full) and drove it up and down the street and had it happen one more time. I had the car towed back to the shop. They inspected it, test drove it, and said they couldn't find anything wrong. HELP!
#4 of 4 Blazer brakes by duntov May 27, 2009 (2:14 pm)
I thought GM solved the brake problem by 1994 but I suppose they did not. That was a problem with early ABS brakes. My 1991 S10 Blazer 4x4 had the same problem but it was a soft pedal and it went to the floor. The problem appeared to be a by-passing master cylinder. They had recall on the 1993 -2000 S10 Blazers with ABS brakes and replaced the electronic selector switch. That was NOT the problem. A congressional hearling was held and GM wiggled out of the ABS problem by telling the congressmen "customers who purchased their GM vehicles with ABS brakes were not accoustomed to how the brakes operate". That is total nonsense.    The Kelsey-Hays ABS (EBC4) modulator is the culprit. I tried to purchase a rebuilt modulator for my 1991 S10 Blazer 4x4 but the only way I could get a rebuilt one is to send mine to a rebuilder and get it rebuilt for about $700. The modulator must be kept clean of any debris or dirty fluid. A tiny speck of dirt or a piece of rubber seal can cause the ABS modulater valves to by-pass and the brakes get spongy and sink to the floor. Many master cylinders have been replaced thinking that was the problem   I solved my braking problem by replacing every component of the entire braking system (except the ABS modulator) which was unnessessary. The main problem was old dirty fluid. The brake fluid in my 1991 S10 Blazer brake systen was the original fluid. I bled the sytem with fresh DOT 3 brake fluid by foot bleeding and it took six hours. A pressure bleeder attached to the master cylinder will work a lot better than foot bleeding. There is a special procedure you must follow and it5 is still difficult and time consuming to bleed ABS brakes including the ABS modulator. If they don't have a pressure bleeder that fits the GM mastercykinder, some auto repair shops merely give up on the job after a couiple of hours and never get all the air out of the system.   1. Bleed the brakes and be patient because it takes time to bleed ABS brakes. . 2. If that fails, replace the ABS modulator and bleed the brakes again. A rebuilt ABS modulators are available at local parts stores for a 2000 Blazer.

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