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Chevrolet Blazer, GMC, SUV
#9 of 116 2000 Blazer 4WD pedal goes to floor after replaceing everything
Jan 05, 2010 (1:12 pm)
I have a 2000 Chevy Blazer 4WD and took it to the shop to replace rotors and pads on the rear. While driving it home, the rear drivers side wheel started to smoke bad! Had them tow it back. At that point they replaced the calipers and replaced the lines as well. Went to pick it up and now the pedal is going to the floor even after I watched them bleed the lines. They seem to be at a loss. So am I. Of course this is not my expertise. Cam someone shed some light on my problem?
Would be greatly appreciated! THX
#10 of 116 Re: 2000 Blazer 4WD pedal goes to floor after replaceing everything [unicorn333]
Jan 05, 2010 (1:42 pm)
Well, I can tell you now that the rear calipers have to be replaced *almost* everytime the rear brakes are replaced. As far as the pedal going to the floor, they need to bleed the brakes again. It sounds like they may have gotten air into the master cylinder while bleeding the calipers. It takes a good bit of fluid to fill the new lines and calipers, and if you aren't watching carefully you can let the fluid level drop too far in the master cylinder and suck air into the system.
Nothing too magical about bleeding the system, just takes time to be sure and get all the air out.
#11 of 116 Brake Noise in 2002 LS Blazer
Apr 26, 2010 (11:21 am)
I had my brake pads replaced 13 months ago and I hardly drive my car. I have a noise in the rear passenger side of the tire that can be heard when driving slow (25-40 MPH). When I apply the brakes it stops. It sounds like a scraping noise. What could be the problem? Thanks for your help.
#12 of 116 caliper bolts
Apr 26, 2010 (12:47 pm)
I had a similar problem with my 1991 S10 Blazer front disc brakes. The person who replaced the front brake pads over torqued one of the caliper bolts and pulled the threads in the steering knuckle. The brakes worked fine for about about two weeks and finally the caliper bolt fell out and the brake caliper was being held on by only one bolt and it became so loose I could hear in rattle. I took the caliper off and managed to save the steering knucle bu using a caliper bolt with oversize threads (NAPA) which cut new threads in the steering knuckle threaded hole. It is tight and works fine after about 5,000 miles. However, I don't know if that will be a permanent repair until I replace the front pads again.. When I remove the caliper bolt that has the oversize threads, it may take out the damaged threads in the steering knuckle with it. Then I will have to heli-coil the steering knuckle or replace it.
Those caliper bolts require only 37 lb. torque and not a ounce more. !!! Many so-called auto technicians do not uise a torque wrench to tighten those bolts (they must supply their own tools where they work) and will use "More's Law" (if the correct amout is good, "More" is better) They will use their "armstrong" torque wrench and tighten the bolts as tight as they can which will usually ruin the threads in the steering knuckle. After they damage the threads in your expensive steering knuckle, they usually do not say anything about it because it would be their responsibility to spend 4 hours replacing your $300 steering knuckle.
Check your rear brake caliper for looseness. The bolts could have been over torqued or not torqued enough.,
#13 of 116 Re: 2000 Blazer 4WD pedal goes to floor after replaceing everything [unicorn333]
May 01, 2010 (9:06 am)
Unicorn, so what is the result? I have the exact same problem? Did you ever get it fixed??
#14 of 116 Re: 2000 Blazer 4WD pedal goes to floor after replaceing everything [kimchoc]
May 03, 2010 (4:46 am)
As it turns out, They needed to bleed the brakes more is all. I'm back and running normal.
#15 of 116 Re: 2000 Blazer 4WD pedal goes to floor after replaceing everything [unicorn333]
May 03, 2010 (5:38 am)
Thanks for the reply. In my case the, Autozone had the part numbers backwards and the calipers were on the wrong side. With the eagle eye of a friend and nothing to loose, we swapped them and all is well. Thanks for returning and posting.
#16 of 116 Bleeding ABS brakes
May 03, 2010 (5:40 am)
Bleeding ABS brakes is a sore spot on the Chevrolet S10 Blazers. Most auto repair shops give up trying to get the correct brake pedal travel after about 2 hours of foot pumping. The shop then will tell the customer that the ABS modulator is bad and needs to be replaced. The ABS modulator costs $700 for a rebuilt unit for the 1985 -1994 ABS brake systems. Rebuilt modulators are not available anymore and the customers old ABS modulator must be rebuilt by some company that rebuilds auto parts for auto parts retailers. The cost of rebuilding and replacing the ABS modulator usually causes the owner of an older S10 Blazer to junk the vehicle. Most auto repar shops will not attempt to replace a ABS modulator a 1985 - 1995 S10 Blazer unless the customer puts up a $500 deposit before the work begins. Auto repair shops are afraid when the job exceeds the cost of the vehicle value, the customer will walk away from the job and give the S10 Blazer to the auto repair shop.
Most of the time all that is wrong with the ABS brake system is air in the lines. It takes an extraordinary amount of time, a special procedure and a l;ot of patience to bleed those brakes especuially if you don't have the proper tools. . If a auto shop technician tries to foot bleed the S10 Blazer 4WD ABS brakes he may never get correct brake pedal travel because his is merely pushing air back and forth in the brake lines. . A pressure bleeder is required to maintain a constant pressure as the air is pushed out of the system and most auto repair shops don't have a pressure bleeder that fits an S10 Blazer master cylinder. A special reverse pressure brake bleeder is available that pressurizes the brake lines from the wheel cylinders to the master cylinder and expells the air out of the master cylinder. . That special brake bleeder kit cost about $300 and most auto repair shop technicians will not invest that much money in a brake bleeder kit that they may not use but once every five or ten years.
About 1995, the NTSB had a hearing about the earlier ABS brake systems on the S10 Blazders but GM fooled the NTSB and blamed the failures on the drivers not knowing how to use ABS brakes and got out of an expensive recall.
You are fortunate to have a 2000 Blazer because GM made vast improvements to the ABS brake system since 1996 and the later model ABS modulators are much more reliable..
#17 of 116 2000 Chevy Blazer LS 4wd rear calipers sticking
Feb 06, 2011 (2:29 pm)
After pressing on the brakes the rear calipers do not release causing the back tires to get extremely hot while driving for some time.When I am coming to a stop I feel brake grab. I do not know very much at all about what causes this, if I need to replace calipers and hoses or what. I would really like some feed back before I take it to the shop and spend alot more than nessesary. Thank you...
#18 of 116 Re: 2000 Chevy Blazer LS 4wd rear calipers sticking [danigirl]
Feb 06, 2011 (5:10 pm)
Just go get a couple rear calipers and install them. This is a common problem with S10 rear disc..