Brake & Master Cylinder Issues-Fade

[Guest Anonymous]

Hello, I'm having brake problems that seem to be

getting worse. When I apply the brakes, they seem

to work fine at first, but when I hold them down,

they fade almost to the floor causing brake failure.

Is that a master cylinder vacuum issue? I looked

at the hose and it looked OK...I bled them a few

days ago and they seem to be fine, but when I hold

down the pedal, fade to the point of failure....I might

get a different working system and recondition it on

the workbench. I'm thinking new stainless lines

would help the system work better. If anyone

knows an easy fix to this problem, I'd appreciate it...

[Guest Anonymous]

(nt)

[Guest Anonymous]

Does it use fluid? If so, definitely pull the master off of the booster, and look inside for fluid. You are not experiencing a vacuum issue. Loss of vacuum wouldn't cause the pedal to go to the floor, it would cause a hard pedal. You are experiencing some sort of loss (or limit) of fluid pressure. Most likely culprit is the MC; it probably can't take the pressure. If the leak were in the wheel(s), it would have to be in at least places...because the 2002 has a dual-circuit, and you would probably have pressure in at least one of them, thus keeping your pedal off the floor.

Mike

[Guest Anonymous]

How many posts in the last week have we seen on spongy brakes, brakes that push to the floor sloowly...

It's been discussed, either you've still got air in the system (aka you didn't know how to bleed correctly), or your MC is failing loosing fluid into the booster, or you're leaking someplace.

Arrrrrrrrgh, sorry for the frustration, but that's the 3 things you're likely looking at.

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BigDog

'76 2002 Big Brakes

[Guest Anonymous]

it looks similar to one I saw on a 1967 2000.

[Guest Anonymous]

Fluid goes past the piston so the pedal can go to the floor, the fluid doesn't leak out anyplace, just internally. No puddles, no fluid in the booster. Usually it holds if you push hard, then if you push softly it slowly oozes down to the floor. Replace the master cylinder, you're good to go.

[Guest Anonymous]

it's the master cylinder internally bypassing - very common.

in the future - flush the brake and clutch yearly.