Brake booster and pedal problem - Team Camaro Tech
Brakes, Suspension & Steering Conversion questions, Steering & Handling

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post #1 of 10 (permalink) Old Aug 29th, 18, 07:25 PM Thread Starter
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Ruben
 
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Brake booster and pedal problem

So i have c5 brakes on the 69 using a 9 inch dual diaphram booster with wilwood master cylinder... For somereason the pedal just pressess down alittle and doesnt depress the booster completely so makes the master cylinder not push fluid down the lines. I ajusted the rod from booster to pedal different ways and still doesnt press all the way down... All the lines are new so no fluid there yet only on the master cylinder
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post #2 of 10 (permalink) Old Aug 30th, 18, 03:15 AM
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Don
 
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Re: Brake booster and pedal problem

Which hole on the pedal did you connect the clevis to? Should be the lower one.

Don

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post #3 of 10 (permalink) Old Aug 30th, 18, 03:35 AM
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Re: Brake booster and pedal problem

Are you saying the pedal only moves a little when you step on it and stops?

Your rod may be too long and the piston in the master is preloaded and not getting full stroke and bottoming out
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post #4 of 10 (permalink) Old Aug 30th, 18, 06:52 AM
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Re: Brake booster and pedal problem

Since you have a vacuum booster, you have two rods to play with. So far you have tried to adjust the brake pedal rod.

The other one is between the vacuum booster and master cylinder. Separate the master cylinder from the vacuum booster. Inside the vacuum booster you will see a little rod that pushes against the master cylinder piston. There should be about 1/16" gap between the vacuum booster rod and the master cylinder piston when everything is bolted together. Place a little piece of clay on the tip of the rod and reassemble the two together. Separate them again and look at the clay. There should be a thin film of clay (1/16") on the tip of the rod. The last time I did this I used a clay bar that is used to detail the paint job on a car. The rod should be adjustable by turning it. Once you get this rod correct length, now you can adjust the brake pedal rod.

Bench bleed your master cylinder.
Put everything back on your car and fill the reservoir with brake fluid.
Take the master cylinder cover off of the reservoir.
Watch the fluid intently.
Have someone press the brake pedal just a little bit. Just barely move the pedal.
You should see the fluid move in the reservoir as it is being forced down the brake lines as the brake pedal is pressed.
If you do not see fluid moving at all, and you pressed the pedal all the way to the floor or it stops before it gets to the floor, then the brake pedal rod is too long.
If you press the brake pedal more than an inch and then the fluid starts moving, then the brake pedal rod is too short.
You will have to fine tune this adjustment by driving the car and adjusting the rod to suit your taste.
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post #5 of 10 (permalink) Old Aug 30th, 18, 02:13 PM Thread Starter
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So i tried it now the pedal travels more but no fluid comes out the calipers to bleed them. All the lines are new so no fluid in them yet. The fluid from master cylinder doesnt lower . I bench bled the mastercylinder
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post #6 of 10 (permalink) Old Aug 30th, 18, 02:25 PM
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Re: Brake booster and pedal problem

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Originally Posted by 69firebird461 View Post
So i tried it now the pedal travels more but no fluid comes out the calipers to bleed them. All the lines are new so no fluid in them yet. The fluid from master cylinder doesnt lower . I bench bled the mastercylinder
Is the pedal going all the way to the floor when you push it?

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post #7 of 10 (permalink) Old Aug 30th, 18, 03:12 PM Thread Starter
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Nope doesnt go all the way to the floor
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post #8 of 10 (permalink) Old Aug 30th, 18, 03:25 PM
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Re: Brake booster and pedal problem

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Nope doesnt go all the way to the floor
how far does it go from all the way up to all the way down? 25%, 50% ???
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post #9 of 10 (permalink) Old Aug 31st, 18, 11:45 AM Thread Starter
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I say about 50 percent
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post #10 of 10 (permalink) Old Aug 31st, 18, 12:05 PM
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Re: Brake booster and pedal problem

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Originally Posted by 69firebird461 View Post
I say about 50 percent
Then something is not installed correctly
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