70 camaro brake bleeding problem - Team Camaro Tech
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post #1 of 7 (permalink) Old Oct 29th, 11, 10:55 AM Thread Starter
Bill
 
Join Date: Aug 2011
Location: Louisville Ky
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70 camaro brake bleeding problem

Replaced booster, master cylinder, prop valve, hold off but can't get fluid to the rear brakes while trying bleeding. Does anybody know any tricks?
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post #2 of 7 (permalink) Old Oct 29th, 11, 12:36 PM
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Mike
 
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Re: 70 camaro brake bleeding problem

Make sure the rod that goes into the master cylinder is not to long.

Take the master cylinder back off and measure the rod and compare it to the booster and how far it goes into the master cylinder.

The one I just put on pushed the master cylinder piston in about 3/16" and we would get pressure the first time them it would go away. The owner had the rod for the pedal adjusted wrong.

Mike
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post #3 of 7 (permalink) Old Oct 30th, 11, 04:43 AM
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alex
 
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Re: 70 camaro brake bleeding problem

Hi Bill. Did you bench bleed the master before you installed it?if you didn,t that could be your problem as well as the wrong rod. I have always used a local rebuilder for things like power boosters to eliminate any problems like this. Assuming that everything else is o/k you should be able to bleed your system. If that doesn,t work for you and sometimes it don,t for whatever reason,check out some of the older shops in town to see if they will loan or rent you a pressure bleeder. Amco makes a good one. that should take care of it. don,t get discouraged. My brother in law ANThony once had a 77 88 olds that lost the line front to rear. We also had to change the prop valve because the line would not come out and we used so much heat that we ruined the valve. By the time we were done before we got fluid to the rear and finally got a good pedal feel to equalize the system . We must have bled the4 wheels 2000 times and used a bunch of brake fluid but it was 2 bucks a qt back then. I was almost in tears over it .Anthony Thought it was funny, i didn,t. I almost killed him, just kidding . HE is a keeper always there without fail .We laugh about it today. Alex
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post #4 of 7 (permalink) Old Oct 30th, 11, 07:09 AM Thread Starter
Bill
 
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Location: Louisville Ky
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Re: 70 camaro brake bleeding problem

When trying to bleed the rear brakes, we are getting very little air and just a few drops of fluid. Petal will not go to the floor when opening bleeders. We put a new original style prop valve on car also.
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post #5 of 7 (permalink) Old Oct 30th, 11, 08:47 AM
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Steve
 
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Re: 70 camaro brake bleeding problem

Bench bleed the master cylinder first - then using a power bleeder is the best approach.

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post #6 of 7 (permalink) Old Oct 30th, 11, 08:49 AM
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Dan
 
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Re: 70 camaro brake bleeding problem

Try gravity bleeding them.....put plastic tubing over the rear bleeders to drain into a bowl ....open them and walk away for a couple hours....keep checking the fluid level in the MC periodically.....



DAN
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post #7 of 7 (permalink) Old Oct 30th, 11, 08:28 PM
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Eddie Garcia
 
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Re: 70 camaro brake bleeding problem

Hello everyone Im new to team camaro...looks like a cool site.

I have a similar problem with my 69 camaro. I bought a kit from ground up restoration that converts your brakes to power brakes. Ive installed the kit and changed everything on the car, every line is new...that is probably the issue.lol
When it came down to the bleeding , it bleeds ok ,it seems, from every line but the brakes are still spongy. They get firm if you pump the pedal a few times but then gets spongy again. Does anyone have a pic of their setup with the proportioning valve? My kit came with a black extension rod that your suppose to put in the hole of the piston on the back of the master cylinder where the booster pushes it..I wonder if that may be wrong.
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