1978 corvette brake problem - Chevelle Tech
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Old Jul 9th, 12, 4:07 PM
no1dc no1dc is offline
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Pete
 
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Default 1978 corvette brake problem

For a while I've had a problem with my brakes in my 1978 corvette. The red brake light comes on. I can pump the pedal a few times and it goes out but will come on again. The brake pedal is low. Fluid in resevouir is full. I found the drivers front caliper leaking replaced it, bled the sytem and same problem. The car is driven rarely if that makes any difference. TIA Pete
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1970 Chevelle 350cu w/ th350, 750 edel carb, perform intake and big lopey cam unknown specs which produces low vacuum 7-9", otherwise stock motor.
67 std Camaro conv, 1978 Corvette, 2-97 & 00 Grand Prixs, 03 Envoy
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  #2  
Old Jul 9th, 12, 4:58 PM
oktunes oktunes is offline
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Matt
 
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Default Re: 1978 corvette brake problem

If this is the same style caliper as the 73 models have, you could have too much run out on a rotor. That will allow the caliper to draw in air and brakes will be gone or on the floor. There will be no leakage of fluid. The rear rotors need to be shimmed and dialed in . I had this problem with my 73 after installing stainless calipers.

Bled brakes and they were great, drive 30 miles and the car wouldn't hardly stop. Bled again, everything fine, 30 miles no brakes. Local Vette shop helped me solve this, so it must be a common occurence.,
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Old Jul 9th, 12, 10:02 PM
grin07 grin07 is offline
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Default Re: 1978 corvette brake problem

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Originally Posted by no1dc View Post
For a while I've had a problem with my brakes in my 1978 corvette. The red brake light comes on. I can pump the pedal a few times and it goes out but will come on again. The brake pedal is low. Fluid in resevouir is full. I found the drivers front caliper leaking replaced it, bled the sytem and same problem. The car is driven rarely if that makes any difference. TIA Pete
OKTUNES is right, you have too much rotor runout on the wheel where you are finding the air in the caliper. The cheap fix involves a dial indicator and some shim stock between the axle flange and the rotor. Sometimes the rotor can be reindexed and not need the shim stock, so try it on all 5 different wheel studs first.
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