Brake Problems Again Help
Thread Starter
Advanced
Joined: Jun 2010
Posts: 60
Likes: 0
From: Miami FL
Brake Problems Again Help
Ok well I had previous brake problems before. After replacing all the Z06 C5 calipers, brake pads, rotors, master cylinder, proportional valve bleeding the system correcting and installing new SS brake lines my 2000 C5 pedal still has erratic pedal feel to it.
Sometimes I press the brakes and they are really hard other times they feel normal. I even have to push the pedal down pretty hard to even get the back brake lights to light up. At first I thought it was the brake booster but brakes are sticky from time to time aswell.
I really confused at this point I have troubleshooted by disconnecting connector to the ABS and driving and still no difference. Should I just change the brake booster or I'm I missing something?
Sometimes I press the brakes and they are really hard other times they feel normal. I even have to push the pedal down pretty hard to even get the back brake lights to light up. At first I thought it was the brake booster but brakes are sticky from time to time aswell.
I really confused at this point I have troubleshooted by disconnecting connector to the ABS and driving and still no difference. Should I just change the brake booster or I'm I missing something?
Le Mans Master
Joined: Mar 2004
Posts: 8,700
Likes: 298
From: Ft. Lauderdale Fl
Ok well I had previous brake problems before. After replacing all the Z06 C5 calipers, brake pads, rotors, master cylinder, proportional valve bleeding the system correcting and installing new SS brake lines my 2000 C5 pedal still has erratic pedal feel to it.
Sometimes I press the brakes and they are really hard other times they feel normal. I even have to push the pedal down pretty hard to even get the back brake lights to light up. At first I thought it was the brake booster but brakes are sticky from time to time aswell.
I really confused at this point I have troubleshooted by disconnecting connector to the ABS and driving and still no difference. Should I just change the brake booster or I'm I missing something?
Sometimes I press the brakes and they are really hard other times they feel normal. I even have to push the pedal down pretty hard to even get the back brake lights to light up. At first I thought it was the brake booster but brakes are sticky from time to time aswell.
I really confused at this point I have troubleshooted by disconnecting connector to the ABS and driving and still no difference. Should I just change the brake booster or I'm I missing something?
Did you do a complete system bleed and replace with fresh fluid?
Drifting
Joined: Sep 1999
Posts: 1,574
Likes: 2
From: Orlando FL
I had a problem with one of the bleeder valves so that added to the issue. I went and bought one of those power bleeders that hooks up to an air compressor. That thing sucked every bit of air our of the system. If you don't want to buy one just find a shop that will do it. I'd try that before you just start replacing brake components.
Tom
Last edited by dragon84; Jan 30, 2011 at 10:25 PM.
Instructor
Joined: Jun 2008
Posts: 233
Likes: 1
From: Austin Texas
In my experience air in the hydraulic lines manifests as spongy brakes that require rapid pumping to generate a firm pedal. Your described symptom sounds different. If it were my car I'd temporarily isolate the vacuum from the boost diaphragm to see if there is any difference in pedal feel. There may be an intermittent obstruction in that circuit somewhere.
Disclaimer: Internet diagnostics are imprecise and often a shot in the dark. I mean no offense to anyone: it's only my opinion.
Disclaimer: Internet diagnostics are imprecise and often a shot in the dark. I mean no offense to anyone: it's only my opinion.
