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c4 need to pump brakes

kwlong

Member
Joined
Dec 6, 2009
Messages
14
Location
Asheboro,N.C.
Corvette
1989 Red
I have a 1989 C4 that I need to pump the brakes to get a solid pedal.
I have replaced the booster, front calipers rotors and pads, and stainless steel brake lines.
The master cylinder does not leak.
I have bled the brakes 3 times.
I still have to pump the brakes 3 times to get a good peddle.
With the motor off, I have good peddle.
Any thoughts.
Thanks Ken Long
 

tmkassin

Well-known member
Joined
May 17, 2009
Messages
271
Location
Macomb,MI
Corvette
2009 LS3
You have air in the system. Sometimes it can be a real pain to bleed it out. I always start with the wheel farthest from the master cylinder. It is important to close the bleeder when the pedal bottoms out, then let the pedal out, open the bleeder and depress it again. You might have to do this several times to get all the air out.
 

kwlong

Member
Joined
Dec 6, 2009
Messages
14
Location
Asheboro,N.C.
Corvette
1989 Red
Brakes

That has been done twice by the shop, I was there when they did it.
I keep thinking that is the problem.
I had the owner of the dealership drive it and he suggested I check the forum.
Thanks for your feedback.
We will do it again.
You have air in the system. Sometimes it can be a real pain to bleed it out. I always start with the wheel farthest from the master cylinder. It is important to close the bleeder when the pedal bottoms out, then let the pedal out, open the bleeder and depress it again. You might have to do this several times to get all the air out.
 
Joined
May 22, 2005
Messages
457
Location
Maryland
Corvette
2001 Z06
I have a 1989 C4 that I need to pump the brakes to get a solid pedal.
I have replaced the booster, front calipers rotors and pads, and stainless steel brake lines.
The master cylinder does not leak.
I have bled the brakes 3 times.
I still have to pump the brakes 3 times to get a good peddle.
With the motor off, I have good peddle.
Any thoughts.
Thanks Ken Long

Went through that about 3 yrs ago with my 89..Finally after the 5th time bleeding, I got a solid pedal. I wish ya luck.
 

Wegone

Well-known member
Joined
Apr 9, 2002
Messages
516
Location
Atlanta GA.
Corvette
82,91 ZR-1,
My guess is you have a bad master. Just because the master cylinder does not leak does not mean the seals are not bad internally letting the pressure leak between the front and rear sections or by both.
 

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