Thread: Brake problems

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I may be wrong but I don't think you can't block one port and use the other for a test unless the blocked port can bleed off how will the pedal move??

Originally Posted by cffisher

I may be wrong but I don't think you can't block one port and use the other for a test unless the blocked port can bleed off how will the pedal move??

The pedal isn't supposed to move if the master is good. That's the whole idea, to find out if the master is leaking back internally and not providing pressure to the calipers.

Well Guys I'm almost positive its the master cylinder now, last evening I pushed on the pedal and it seemed that there was a small amout of pressure and then the pedal hit the floor. When this happened I heard the fluid in the master cylinder as if it is just passing through the master and going nowhere else.
Only when I take one of the lines off at the wheels does the fluid move, other than that once the line is put back on and the system is closed then the fluid seems to only move in the master cylinder.

Thanks, Rocky

master cylinder is bypassing

Thats what I thought

Rocky72...You ask if the lines should be hooked up back-to-front and front-to-back,this is right when you have disc/drum, front/rear, but shouldn't matter with discs all around. By the way, your master is facing the "wrong" way, so it should be front-to-front in this application.
I agree that your master is either faulty, or not the right one for your setup, but it could still be a bleeding glitch. Have you checked that the master piston is actually returning when pedal pressure is released? Sometimes the system locks and holds the piston down.

Well , I put the new master cylinder on today and bled the hell out of it and still no brakes I am completely out of ideas. Had another guy up and he can't figure it out either.
Shouldn't there be some sort of pressure at the pedal even if there is some air in the lines ??? Everything that I've read says that if there is air in the lines that the pedal would still have some pressure, even a soft pedal.
Checked the master and the piston is returning so what could it be ???
and I adjusted the booster rod.
Is it illegal to shoot your own car, cause thats next on the list.

Rocky

Yep, thats what we did, and made sure that the master had fluid.

Yeah, we just went through and bled the brakes again and still nothing. It seems as if there is a very small amount of pressure and then its gone.

It seems to build minimal pumping it fast but does not hold at all.

Something we havent ask:
What calipers are on the front?
What calipers are on the rear?
What did the new master cylinder fit?

Do the pads have the correct clearance? Some pads have
automatic adjusters that need to be set.

When you bench bled the brakes, did you wait for 20 seconds
or so between strokes to allow the air to bubble up to the
top?

We will think some more on this....

mike in tucson

This is an interesting article but it doesnt have a picture of your
car in it.... http://www.babcox.com/editorial/bf/bf60133.htm

thay are talking about low drag calipers with the wrong master
cylinder..... just an idea

mike in tucson

I don't know what calipers are on this car, when I got the car it came with the brake setup on it . I did bleed the master as you said. The pads are against the rotors and it seems that they have some pressure but not enough to do anything.

I'm going to get in touch with the guy I bought the roller from and see if they had any other problems like this, maybe this isn't the first time. And then if that doesn't work then I'm going to shoot the car For now I think it's time for a cold one and to chill out a bit.

Thank's Rocky

Hey Guys , guess what ??? I went out and tried a small adjustment on the end that hooks to the pedal from the booster. I took it out as far as I could and now I'm building pressure, the only problem is that the end is just about to come off the booster rod. I guess I'll have to find a rod end thats longer so it will be on by more than a few threads.