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master cylinder problems

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New User

Nov 10, 2006, 6:38 PM

Post #1 of 4 (1825 views)
master cylinder problems Sign In

I put new brake pads and shoes on my 1988 Chevy Silverado K1500 and adjusted the rear brakes. When I was done I stepped on the pedal to center the shoes, as I have always done with all my other vehicles when I did a brake job. After one or two pumps the pedal went to the floor and I was unable to get a good pedal. I figured the master cylinder failed so I bought a remanufactured one and installed it. I still have the same problem in that the pedal goes to the floor and won't pump up to a good pedal in order to bleed the brakes.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 10, 2006, 9:11 PM

Post #2 of 4 (1821 views)
Re: master cylinder problems Sign In

Some thoughts on this:

Are you convinced that bench bleeding the master was ok?

If you are using a helper to pump the brake for bleeding are they holding the pedal down till you tighten up the bleeder? If not it'll just suck air back in.

Also: It's possible you have a bad new master cylinder and that's tough to determine, T

steve01832 profile image

Nov 11, 2006, 2:45 AM

Post #3 of 4 (1819 views)
Re: master cylinder problems Sign In

Check the proportioning valve. Sometimes the check valve on the front needs to be reset (by pushing back in). It has a little black rubber boot around it.


Anonymous Poster

Nov 11, 2006, 4:06 PM

Post #4 of 4 (1813 views)
Re: master cylinder problems Sign In

I would suspect damaged brake line ( rubber flex line LF and RF )


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