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Old 12-31-2001, 03:19 PM
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78 Vette with Spongy Brake Pedal!


I have a 78 vette with an issue I have been dealing with for about a year! Its Driving me nuts!

The brake pedal goes almost all the way to the floor, with only an inch of actual "good pedal"

It appears only the front two wheels are braking, but the back two do "squeak"

I have replaced:

The master calendar
The Brake Proportioning Valve
rear brake lines.

The master Cylinder is never low on fluid, and the rear calipers always are full of fluid, never dry

But, when I bleed the rear brakes, there is always a lot of air in the back, and this does correct the problem for a day or two.

Anyone have any suggestions?
Should I go ahead and replace the calipers.
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Old 01-04-2002, 09:55 AM
Plumb Country
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Any signs of leaking anywhere. Your taking in air from somewhere. I'd look for a wet spot on one of the lines somewhere. These closed systems can **** air in from the smallest of holes.

By the way, wish I had a 78 Vette to have a problem with. Great Car.
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Old 01-13-2002, 01:19 PM
Lyn Sievers
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78 vette with spongy Brake Pedal

I have a 76 vette and had problems with getting all the air out of the brake lines too. Bleeding the brakes by pumping the pedal and holding the pedal down didn't do the job.
What I did was take my air tank and pump it down with my vacuum pump. Then I put a hose from the bleeder to the air tank with the vacuum in it. I started on the drivers side back wheel and sucked alot of of fluid through the lines. Keep the master cylinder full of brake fluid. Then go to the passenger side wheel and do the same. Then to the front passenger side. Then to the drivers side. Pull a couple of bottles of brake fluid through the lines. After you do all four of the wheels go back and bleed the brakes by the pedal method. This should fix it.
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Old 01-14-2002, 03:53 PM
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Thanks a lot guys, great info.
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Old 01-15-2002, 02:02 PM
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bad brakes

try vette brakes in Saint Petersburg Florida. I had TERRIBLE braking on my 68 camaro until I put on a set of their 4 wheel disc brakes.
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Old 10-11-2004, 06:13 PM
L81 L81 is offline
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spongy pedal

would like to know how you made out i have the same problem with my 81.
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Old 10-12-2004, 08:55 AM
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vetteonr vetteonr is offline
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As stated before, you are getting air in the system from somewhere. You need to bleed vette brakes longer than your normal brake system. I don't know why, you just have to. Find and remedy the leak before buying new calipers, unless of course, the leak is in the caliper. The usual culprits are pin holes in the flexible lines near the caliper. Another thought, you might need to replace the booster. Keep us posted about your brakes.

BTW, this thread will probably be moved to "your own projects" shortly. This is for suggestions about the website.

Corvette.......Enough Said!!

Jeez, I wish I could put a photo in here!

"If you need good wrenches, make sure you know how to use them!"
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Old 10-12-2004, 01:59 PM
dougbfresh dougbfresh is offline
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See the other vette brake thread.
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