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'79 Brake Problem

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Old May 9, 2013 | 04:12 PM
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'79 Brake Problem

I have a problem with my brakes that I can't seem to figure out. At first I had air in my lines so the pads weren't releasing pressure off the rotors when I released the brake pedal. When I went to bleed the brakes I stripped the bleeder screw off one of the calipers. Anyway I installed the new caliper, bled the brakes and I still have no brake pressure, I mean the pedal goes to the floor. I took it on a test run around the block, gave it some gas, hit the brakes and the back tires locked up so the back seems to be working fine. I really don't know much about brakes but I was thinking it might be the proportioning valve? What do yall think?
 
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Old May 9, 2013 | 04:40 PM
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Based off what you have said, it sounds like a master cylinder issue... If you bled the brakes and got fluid out the front then the proportioning valve isn't blocked..
 
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Old May 9, 2013 | 04:51 PM
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Alright. Do you think I might have the brake booster vacuum line hooked up in the wrong place? I got a 650 cfm Holley double pumper and I got the vacuum line hooked up to the big one on the back of the carb.
 
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Old May 9, 2013 | 06:11 PM
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No, on a Holley, that port works and if it was there was an issue with vacuum and the booster the pedal would be hard to press.
 
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Old May 10, 2013 | 12:54 AM
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Originally Posted by 460 FORD MAN
I have a problem with my brakes that I can't seem to figure out. At first I had air in my lines so the pads weren't releasing pressure off the rotors when I released the brake pedal. When I went to bleed the brakes I stripped the bleeder screw off one of the calipers. Anyway I installed the new caliper, bled the brakes and I still have no brake pressure, I mean the pedal goes to the floor. I took it on a test run around the block, gave it some gas, hit the brakes and the back tires locked up so the back seems to be working fine. I really don't know much about brakes but I was thinking it might be the proportioning valve? What do yall think?

Are you bleeding them correctly? And make sure you have fluid in your master cylinder.
 
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Old May 10, 2013 | 01:39 AM
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Yep, bled them until there wasn't any bubbles coming out with fresh fluid and started from the furthest away which would be the back passenger side and worked my way to the closest.
 
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Old May 10, 2013 | 09:58 AM
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Originally Posted by 460 FORD MAN
Yep, bled them until there wasn't any bubbles coming out with fresh fluid and started from the furthest away which would be the back passenger side and worked my way to the closest.
that's part of it...with the vehicle off pump the brakes up till they are hard to press then open the bleeder. Apply the brakes till theres no bubbles coming out. then close the bleeder. repeat for each wheel in the order you did..
 
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Old May 11, 2013 | 06:41 PM
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Alright well I bled the brakes real good again, I guess there was still some air in the lines.
I took it for a test drive, mashed the brakes and about kissed the windshield. lol

Do yall have touchy brakes? It's the first time I've actually had real brake pressure in the truck so it was new to me.
 
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Old May 11, 2013 | 11:06 PM
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Originally Posted by 460 FORD MAN
Alright well I bled the brakes real good again, I guess there was still some air in the lines.
I took it for a test drive, mashed the brakes and about kissed the windshield. lol

Do yall have touchy brakes? It's the first time I've actually had real brake pressure in the truck so it was new to me.
I didn't brake check mine on pavement but I slammed it on gravel and all tires locked up lol its good to have good operating brakes!
 
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