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Old February 21st, 2007, 01:08 PM   #1
fukkinrizzo
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Exclamation rear discs on a chevy

I have a friend who put rear dics on his truck but is not getting enough pressure to the back discs. when driving he can lock up the front but not the rear.

all calipers are the same and he has a 1ton hydroboost
he used a 1/2 ton proportoning valve and went straight to the master cylinder. Neither worked.
If he jacks up the rear tires the brakes will stop them, but they won't lock up when driving like the front ones do.

any ideas?
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Old February 22nd, 2007, 02:26 PM   #2
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hey rizzo, whats up. I am betting that the prop. valve is restricting the flow too much. with the rear discs he might be able to get away with running without a prop valve to the rear, full pressure wont cause the braking issues with discs as it will with the drum brakes. if needed you can get an adjustable prop. valve and use it. I will be doing the adjustable valve on my truck, so I can adjust the braking when i am towing or heavily loaded.
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Old February 22nd, 2007, 02:35 PM   #3
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where is your buddy at?
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Old February 22nd, 2007, 03:42 PM   #4
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Hi Chris.
He is on the north side of PH. Others have told me that a reg. master cyl pushes less fluid to the rear because the drum brakes use less. He is looking for a Master cyl for 4 wheel disc brakes
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Old February 22nd, 2007, 03:46 PM   #5
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hey are the soft lines kinked in any way?
just a thought...
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Old February 22nd, 2007, 04:00 PM   #6
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I don't think so cause he just put the whole thing on, but I will mention that to make sure.
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Old February 22nd, 2007, 04:17 PM   #7
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Make sure the calipers have the bleeder at the top. I used a larger bore MC for a chevy along with the same size ports for the front and rear. I used a 2# residual brake valve from jegs it was like $30 "the red one". With all the trucks out with rear discs I think you could get one at a junkyard for less than $50. Back when I did mine they were over $100 at the junk yard.
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Old March 4th, 2007, 09:34 AM   #8
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back brakes no matter if disc or drums are there to help slow it down not lock up the brakes.thats what i was always told.
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Old March 5th, 2007, 12:29 AM   #9
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this is true, but he is having issues getting any pressure to the rear brakes.
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Old March 5th, 2007, 11:20 AM   #10
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sounds like the poportioning valve most rear conversions give to much brake to the rear and either need an adjustable paportioning valve o use stockcalipers in the rear and the heavy duities up front.
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