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8/2/11 8:17am - Original Message: 'SYMPTOMS of..........'
manchestershark Lifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1895
.......... A bad brake booster. What can I look for,and how can you tell? GOOD brakes, lots of pedal. They have been bled several times.  THANKS
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8/2/11 8:29am - Reply: 'SYMPTOMS of..........'
Jaws79 Lifetime Member
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Sykesville, MD - USA

Vette(s):
1979 Corvette Coupe Corvette Light Blue Midnight Blue interior Mirrored Glass T-tops

Joined: 4/27/2008
Posts: 4211
Why are you looking at this if the brakes are good? I was always taught to check you pedal with the car off and on. There should be better feel on the pedal with the engine running. You could also plug the vaccum line and see the difference.
 
Barry
 
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8/2/11 10:01am - Reply: 'SYMPTOMS of..........'
manchestershark Lifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1895
Confused Maybe I should say the pedal is REAL close to the floor. LOTS of pedal movement, but good brakes.

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8/2/11 1:00pm - Reply: 'SYMPTOMS of..........'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
A bad booster will give you a hard pedal.
If the pedal is going(almost) to the floor, but the car does stop, you have:
Worn pads/rotors
Low fluid
Air in the system
Mis-adjusted pushrod from pedal to booster

Will the pedal "pump up"? Or does it always go down like that?
What car are we dealing with here?
What does the pedal do without the engine running?
Does the pedal go down when the engine is started?
Adams' Apple2011-08-02 10:03:00

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Joel Adams
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8/2/11 1:55pm - Reply: 'SYMPTOMS of..........'
manchestershark Lifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1895
Never gave rod adjustment a thought. Pads and rotors are good. System has been bled multiple times. Fluid is good and no leaks. I am still of the opinion that the system has air in it. Can't seem to get it out. Brakes have been the same since I bought it. 75' base "T" top.Confused

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8/2/11 6:03pm - Reply: 'SYMPTOMS of..........'
Jaws79 Lifetime Member
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Sykesville, MD - USA

Vette(s):
1979 Corvette Coupe Corvette Light Blue Midnight Blue interior Mirrored Glass T-tops

Joined: 4/27/2008
Posts: 4211
Maybe then the rod IS mis adjusted! It's worth a try!
 
Barry
 
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8/2/11 8:43pm - Reply: 'SYMPTOMS of..........'
JoeTrecca
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Charlottesville, VA - USA

Vette(s):
1978 Silver Anniversary L82 Previously: 1965 300hp Coupe in 1967. 1967 435hp Coupe in 1968-70. 1969 350hp T-top w/ac and all power options.

Joined: 9/3/2010
Posts: 103
Possibly the master cylinder needs rebuilt or replaced?

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Joe T
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