1998 Chevrolet Blazer Repair Question
Mileage: 116 miles.
Rear brake problem
Thank you all, and before you guys fire away on me I know I should have done them at the same time.
Asked by chiefcatchemallAnswer
Chances are it is the master cylinder. I test them by removing the steel lines, one at a time, and see if I can hold my thumb over the line opening on the MC. If I can on one and not the other, it's bad.
But my breaks were working fine 5 minutes before I started working on it? That is what I dont understand. It just blows my mind that it would just go bad as I am working on it. Doesnt make much sense to me. I dont want you to think that I am telling you that you are wrong because Im not. I really appreciate any insight! Anybody else with any other ideas?
It can also be the flex line going to the rear axle, assuming it uses one input line with a tee for both rear wheels
Also, did you push the caliper pistons in without opening the bleeder valve on the calipers? If so, you may have damaged the plungers in the MC. It happens often, but people still do it that way to depress the caliper. When I was taught by Bendix, I was told never to force the old fluid back through the system into the MC. Open the bleeder on the caliper and allow the fluid to push out there. Let me know what you find or if you have questions.
Yes it does tee off for both rear wheels...Never really thought about that. I did not compress either of the pistons. So I am ruling that out. When you say flex line what exactly is that? I think I know what you are talking about but I dont want any confusion. Its the main line that leads into the tee correct? I know proportioner valves normally dont go bad, but theoretically it does make sense doesnt it? If I go out in the morning and I am getting a sharp stream of brake fluid out of the front 2 calipers, but nothing out of the back, it COULD be that right?
The flex line is a reference to the rubber brake hose at the caliper. They can go bad inside and block the flow of brake fluid. However, both at the same time is odd. Yes, it could be the proportioning valve, but unlikely. My guess is the MC. Try the trick I said about placing your thumb over the ouputs at the MC. Cover it so if fluid sprays, it doesn't get on anything.
It has a single flex hose that feeds both wheels and that can be the problem.
Well it has a main metal line that leads into the tee. Then it splits off, one to each tire. Still metal line wrapped in hard plastic. Then it goes to the flex line. 1 flex line to each caliper. I am going to go try to bleed the fronts, and check the MC.
There has to be a flex line to connect the frame mounted steel line to the moving rear axle.