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Is this a master cylinder malfunction?

chevyaddict

Well-known member
Joined
Jun 12, 2002
Messages
894
Location
Tucson, AZ USA
Corvette
1990 Convertible
Howdy y'all. I have a question regarding my 68. I had to replace one of my calipers (front driver's side). No problem. Did that, bled the brakes, got all the air out. But now it feels like there is something generally wrong with the braking. The brakes have never worked great on the car to begin with, and now the pedal goes way down and the braking power is really weak. My question is, is this a master cylinder problem? What I typically know about failing master cylinders is that when the seals inside begin to go your pedal will slowly depress to the floor while holding the pedal. But what if you just don't get much pedal in the first place? The car does not have power brakes. Any advice would be appreciated. I have not replaced the master cylinder since I've owned the car, and that has been since 1999.
 

LLC5

Well-known member
Joined
Sep 28, 2004
Messages
2,299
Location
Wa.
Corvette
98 black 6spd convert.
I would say that you either have air in the system or a bad master cylinder. I would bleed/flush all 4 calipers thoroughly and recheck. It is possible if you bled the replacement caliper by pushing the brake pedal to the floor, you may have damaged the seal in the master cylinder. Good luck with it. :)
 

frank_nesta

Well-known member
Joined
Dec 24, 2004
Messages
199
Location
Los Angeles, CA
Corvette
1977 Convertible and 2017 Black Rose Grand Sport
I would say that you either have air in the system or a bad master cylinder. I would bleed/flush all 4 calipers thoroughly and recheck. It is possible if you bled the replacement caliper by pushing the brake pedal to the floor, you may have damaged the seal in the master cylinder. Good luck with it. :)

I agree. First bleed the system. If the problem persist go for the master cylinder.
 

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