Low Brake Pedal - Team Camaro Tech
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post #1 of 7 (permalink) Old May 6th, 07, 06:07 PM Thread Starter
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Low Brake Pedal

After installing a new rear in my 67 Camaro, I decided to convert to rear disc. After completing the installation I found that the brake pedal is low. As you immediately press the pedal the front brakes apply but , the rear do not apply untill half way through pedal travel. The car has small piston GM calipers (79 Monte Carlo style) all around, stock proportioning valve, and a manual brake master cylinder. Before the conversion the car had rear drums with all the components listed previously. Im thinking that I may need to have a different master, one for power brakes since the piston is larger(I believe?). Thank you in advance, I'm sure you guys can help me!

Last edited by K-Performance; May 6th, 07 at 06:28 PM.
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post #2 of 7 (permalink) Old May 6th, 07, 09:07 PM
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Re: Low Brake Pedal

I think your right i believe you need a disc/ disc master.

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post #3 of 7 (permalink) Old May 7th, 07, 05:00 AM
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Re: Low Brake Pedal

I have been told that the master cylinder for disc brakes was larger than the one for manual brakes

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post #4 of 7 (permalink) Old May 7th, 07, 09:53 AM
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Re: Low Brake Pedal

1 1/8" bore is standard for disc or drum, the disc brake master cyls have a larger reservoir than drum MC's.

Those rear calipers you installed often have low pedal problems. The first thing to try is operating the emergency brake off and on to get them to self adjust.

Look for excessive play of the brake pads on one rear caliper, that may indicate the bad one.
David

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post #5 of 7 (permalink) Old May 7th, 07, 09:56 AM
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Re: Low Brake Pedal

Quote:
Originally Posted by davidpozzi View Post
1 1/8" bore is standard for disc or drum, the disc brake master cyls have a larger reservoir than drum MC's.

Those rear calipers you installed often have low pedal problems. The first thing to try is operating the emergency brake off and on to get them to self adjust.

Look for excessive play of the brake pads on one rear caliper, that may indicate the bad one.
David
Based on 79 Monte Carlo, I am guessing he has front calipers at all 4 corners.

Scott from NJ. Stay thirsty, my friends


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post #6 of 7 (permalink) Old May 7th, 07, 01:43 PM Thread Starter
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Re: Low Brake Pedal

Correct, I have front brake calipers all around with no e-brake. After doing other research, I agree with Blaine. I was thinking of trying a disc/ disc master cylinder from a 69 Corvette to increase the volume which I believe I'm currently lacking. Any opinions?
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post #7 of 7 (permalink) Old May 7th, 07, 09:56 PM
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Re: Low Brake Pedal

C3 Vette master cylinder is 1 1/8 bore meant for 4-wheel discs. That's what I'm running on mine now, and it feels a lot better than my old disc/drum (1" bore I think) master felt. Pedal still feels a little soft to me sitting still, but I'm chalking that up to running hydroboost--it'll put you through the windshield long before the pedal is hard.


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