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Old 04-26-2003, 06:17 PM
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Post 1974 Corvette no brakes

Hi folks back again. I feel like a dummy. Still can't get the brakes up on my newly restored 74 Vette. Soft pedal, lots of travel and finally grabs down near the floor. No brake warning indicator light either. I have bled 2 quarts of fluid through the system. I am postive there is no air in the system. Every piece of the system is new Vette Brake Products parts. I have also tried at least one other master cylinder and proportioning valve. Still no luck.

Can't believe this I have done these cars for 25 years and never had a problem like this. Any Corvette guy's/girl's your suggestions would be greatly appreciated.

Thanks

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Old 04-27-2003, 05:45 PM
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I had this exact same problem with my 69 corvette. There are two bleading methods you can try.

1. Gravity blead method. Open one bleader valve at a time keep the master cylinder full, watch the bleader hose in the recovery bottle on the floor, when the bubbles stop, the caliper is free of air. Use a clear container so you can see if fluid is flowing out of the bleader hose.

2. Sometimes this does not work. If you have debree in the line or old flex hoses that have swollen up, gravity bleading doesn't work very well. Buy a $6.95 one man brake blead kit. This is a hose and recovery bottle that is designed to work without closing the bleader valve every time you let the pedal up. The trick to this is to have your recovery bottle HIGHER than your caliper. Pump the brake pedal 10 to 15 times for each caliper. Start with the longest brake line and work to the smallest. If you have a caliper with two blead valves, blead the inside one first then the outside.

3. If you still get bubbles after this, you are pulling air in somewhere in the system. Fill the master cylinder, pump the brake pedal up several times to get as much pressure as you can and have someone hold there foot down on the pedal, or if by yourself wedge a 2 x 4 between the brake pedal and the seat to maintain pressure on the brake system. Get a mirror and your best light and check every inch of the brake line for any fluid leaks. If you discover a leak, this area will also pull air in when you let off on the brake pedal. Hope this solves your problem, let me know what happens.
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Old 04-27-2003, 07:38 PM
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Every thing you mentioned I have done. Also I did a frame off restoration and every rubber hose and line have been replaced. I'll try the vacuun method again.

Thanks
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Old 04-28-2003, 07:46 PM
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Are you saying you still do not have brakes? There is a possibility that some of those new parts are bad. I have had that happen to me. Describe what is happening when you blead each caliper. Are you bleading each caliper, watching the fluid travel out of the bleader hose and doing so until all the bubbles are gone, then getting in the car only to find you do not have a firm pedal?
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