Brake pressure issue - Team Camaro Tech
Brakes, Suspension & Steering Conversion questions, Steering & Handling

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post #1 of 7 (permalink) Old Jun 21st, 17, 05:46 PM Thread Starter
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Joe
 
Join Date: Jun 2017
Location: Orange County
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Brake pressure issue

Hi hello
Recently purchased a 1968 Camaro with a brake issue. When I test drive it brake was really spongy. Barely any brake pressure. Pervious owner stated it just needs a good bleeding. Of course he lied. So far I have replaced Master cylinder, booster and distribution block. Bleed many times by both vacuum and old fashion pumping the brake. I even tried the changing the bleeding valve to quick bleeding so air can't get in. Still no brake pressure. When car is off I get some pressure but when car is on no pressure. Pedal goes to the floor. Please help.
Things I done so far.
Bench bleed MC.
New booster.
New distribution block.
Bleed brake so many ways. And no air bubbles. I must have gone through 4 big bottles of brake fluid.
Front disk and rear drums.
What am I missing ?
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post #2 of 7 (permalink) Old Jun 21st, 17, 07:12 PM
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Jim
 
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Re: Brake pressure issue

Maybe you have some swelling flexible rubber lines going from the front subframe to the wheel cylinder and/or the one going to the rear axle ?.

Jim

1974 Spirit Of America Nova (being restored), 1973 Nova Custom, 1968 Chevy II (Garage Find 2012)

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post #3 of 7 (permalink) Old Jun 22nd, 17, 06:19 PM Thread Starter
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Joe
 
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Update to my story
Turns out the last owner had installed the brake caliber backwards with the bleeder valve pointed down. I reversed it and rebleed. Bang! Brake pressure back
I can now enjoy the car
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post #4 of 7 (permalink) Old Jun 23rd, 17, 11:07 AM
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John
 
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Re: Brake pressure issue

I would have figured you'd notice the bleeders on the bottom when you 1st started bleeding the brakes?
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post #5 of 7 (permalink) Old Jun 23rd, 17, 02:22 PM
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Rob
 
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Re: Brake pressure issue

Yup, I just logged in when I saw your post to tell you to check on that Very thing - calipers on the wrong side. That bit me too and I spent more days trying to figure that one out that I really care to admit!

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post #6 of 7 (permalink) Old Jun 24th, 17, 07:01 AM
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Brett
 
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Re: Brake pressure issue

You mean it makes a difference? I thought that since the system is under pressure, the air would be the first thing to come out regardless of the orientation of the valve. I have Wilwoods, which have bleeders up and down, but I didn't know it made a difference. What is the theory behind "Gravity Bleeding" then and does that mean the reverse bleed that pushes the air out through the top (Master) is preferred?

Brett....

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post #7 of 7 (permalink) Old Jun 24th, 17, 07:25 AM
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Re: Brake pressure issue

Quote:
Originally Posted by Brettallen59 View Post
You mean it makes a difference? I thought that since the system is under pressure, the air would be the first thing to come out regardless of the orientation of the valve. I have Wilwoods, which have bleeders up and down, but I didn't know it made a difference. What is the theory behind "Gravity Bleeding" then and does that mean the reverse bleed that pushes the air out through the top (Master) is preferred?

Brett....
Air always rises to the top.
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