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Brake pedal sometimes not where I left it?

tcannon

Member
Joined
Jun 5, 2017
Messages
5
Location
SF Bay Area
Corvette
C4 track car
Hi everyone. I noticed an odd behavior where if I'm driving a while without using my brakes, the pedal is low when I step on it. The brakes work just fine if I push -- they don't fade -- the will stop the car. I cannot heel-toe with the brake pedal that low though. A quick tap brings the pedal right up where you'd expect it. I sometimes tap with my left before braking so that I know what kind of pedal to expect.

I thought about what might cause this for quite a while, and came up empty. The master cylinder would give me low pedal and brake fade, maybe. There is some kind of vacuum assist and I have no idea how they work but found no logic to it.

I asked around a bit and was suggested the idea that maybe turns and bumps (my race suspension is seemingly made of welded iron) might be pushing the pistons back into the calipers from things flexing around the rotor. I did some research and pad kickback is a thing. Maybe my wheel bearings are a little loose?

I'm just putting this up in case anyone has any better guesses to the problem or if this is a problem you've run into, what was the culprit?

Thanks!
 

dougelam

Well-known member
Joined
Jul 19, 2011
Messages
453
Location
Michigan
Corvette
2002 Roadster
It wouldn't hurt to flush out the old brake fluid with new and that would eliminate any air that might be in the system as well

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DonB

Well-known member
Joined
Mar 25, 2015
Messages
339
Location
Chicago
Corvette
2019 ZO6 in Elkhart Lake Blue
I have to agree with Doug on this.. A good flush and bleed to get any air out. Because what you are describing is "normally" a symptom of air in the lines.

A bad vacuum (assist) booster normally makes the pedal "harder."
 
Last edited:

Vettehead Mikey

Well-known member
Joined
Aug 26, 2003
Messages
3,486
Location
Not that far from Ottawa
Corvette
1973 Coupe
I read the post and got the impression is that the pedal is already low (not against the stop) before the OP puts his foot on it. Air/bad fluid won't do that.
 

tcannon

Member
Joined
Jun 5, 2017
Messages
5
Location
SF Bay Area
Corvette
C4 track car
I read the post and got the impression is that the pedal is already low (not against the stop) before the OP puts his foot on it. Air/bad fluid won't do that.

It was pad knock back from a loose wheel bearing.




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