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77' Brakes Failed while driving!

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Old Apr 6, 2014 | 06:43 PM
  #21  
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So I finally was able to get out to my Vette today and bleed all the brakes again. Started with the back, and did the rear bleeder, then front bleeder on passenger rear brake caliper then did the same on driver side caliper, then continued onto passenger front and then driver front. There was still air in the system, and was able to get it all bled out, with a VERY firm pedal. I started her up to finally test the brakes, and the pedal goes to the floor.

I put her in drive and the brakes work, I'm able to floor the brakes and get a good reaction out of them, but they are super soft and it almost takes to the floor to get them to produce stopping power.

I think it is my Brake Booster, because once I shut the car off, three full presses on the brake pedal, I am back to VERY firm brakes.

Thoughts? Am I right?
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Old Apr 6, 2014 | 10:32 PM
  #22  
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Just a rookie statement: My '68 has a diverter-valve-block directly under the master cylinder that sends all the fluid to the front or the rear lines when a caliper fails...the small piston inside the diverter-valve-block can get stuck causing the brakes NOT to bleed properly.

(You might not even have a diverter valve on your car...just suggesting)
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Old Apr 7, 2014 | 11:49 AM
  #23  
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did you bleed both (2) rear bleeder valves on each rear ???
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Old Apr 7, 2014 | 02:55 PM
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I did bleed both bleeders on the rear brakes.
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Old Apr 7, 2014 | 05:24 PM
  #25  
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Originally Posted by StangRay
So I finally was able to get out to my Vette today and bleed all the brakes again. Started with the back, and did the rear bleeder, then front bleeder on passenger rear brake caliper then did the same on driver side caliper, then continued onto passenger front and then driver front. There was still air in the system, and was able to get it all bled out, with a VERY firm pedal. I started her up to finally test the brakes, and the pedal goes to the floor.

I put her in drive and the brakes work, I'm able to floor the brakes and get a good reaction out of them, but they are super soft and it almost takes to the floor to get them to produce stopping power.

I think it is my Brake Booster, because once I shut the car off, three full presses on the brake pedal, I am back to VERY firm brakes.

Thoughts? Am I right?
Wrong. That is exactly how a good booster works. You have enough reserve to stop the car if the engine dies. A faulty booster causes a hard pedal with very little stopping power.

You either have air in the lines or a leak in the lines.
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