Brake travel on 1996 C4 LT1
08-22-2017, 12:11 PM
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Brake travel on 1996 C4 LT1
I got this Corvette in Dec. 2015. At that time there seemed to be a problem with the brakes as the pedal went almost all the way to the floor before the brakes engaged. A new master cylinder and brake fluid change was done at that time. No change in pedal travel. Flash forward. This year an new vacuum booster was installed and still no change. I replaced the the master cylinder after bench bleeding it and bled the entire hydraulic system. I could not believe the amount of air that was in the rear brake lines. The last think that was done was replace the brake pads.
with the engine off and brake booster relieved the pedal is hard and moves 2.75 inches per the manual. as soon as the engine is started pedal goes almost to the floor, though not quit as far because of the new pads. Is this normal or am I missing something. BTW: the first MC and vacuum booster was replaced by the Chevy dealer.
with the engine off and brake booster relieved the pedal is hard and moves 2.75 inches per the manual. as soon as the engine is started pedal goes almost to the floor, though not quit as far because of the new pads. Is this normal or am I missing something. BTW: the first MC and vacuum booster was replaced by the Chevy dealer.
08-22-2017, 01:09 PM
#2
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No it is NOT normal at all.
The brake pedal in my '96 operates that same as all my other cars I have ever had.
If a brake pedal is going almost to the floor, something isn't right.
1. Air in the system.
2. Bad master cylinder (allowing fluid to bypass piston)
3. A fluid leak somewhere (preventing a firm pedal feel)
The brake pedal in my '96 operates that same as all my other cars I have ever had.
If a brake pedal is going almost to the floor, something isn't right.
1. Air in the system.
2. Bad master cylinder (allowing fluid to bypass piston)
3. A fluid leak somewhere (preventing a firm pedal feel)
08-22-2017, 03:42 PM
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No it is NOT normal at all.
The brake pedal in my '96 operates that same as all my other cars I have ever had.
If a brake pedal is going almost to the floor, something isn't right.
1. Air in the system.
2. Bad master cylinder (allowing fluid to bypass piston)
3. A fluid leak somewhere (preventing a firm pedal feel)
The brake pedal in my '96 operates that same as all my other cars I have ever had.
If a brake pedal is going almost to the floor, something isn't right.
1. Air in the system.
2. Bad master cylinder (allowing fluid to bypass piston)
3. A fluid leak somewhere (preventing a firm pedal feel)
08-30-2017, 01:19 PM
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Short update: A few days ago I talked with a neighbor that is a retired Chevy Mechanic. Afte explaining my problem he told me it probably an air bubble in the brake pressure modulating valve. He said that bleeding the system manually was almost impossible. Pressure bleeding was the best way to get the air bubble out of the valve. He also told me that the Corvette was the only car that had this problem.
We have been getting rain here so I have not tried to get to the local Chevy dealer to get the system pressure bled.
We have been getting rain here so I have not tried to get to the local Chevy dealer to get the system pressure bled.