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07-24-2007, 11:22 PM
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#1 |
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Registered User
Join Date: Feb 2001
Location: Savannah, MO.
Posts: 513
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Disk brake conversion
I've got some problems with my rear disk brakes. The P.O did a rear disk brake conversion on my 72 Blazer. The back brakes keep locking up, they don't seem to want to release all of the time, only sometimes.
Any ideas why this is happening or how I can fix it?? 
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07-25-2007, 08:26 AM
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#2 |
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Licensed to Thrill!
Join Date: Apr 2006
Location: Northwest, GA
Posts: 1,673
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Re: Disk brake conversion
Knee-jerk answer would be wrong prop. valve.
Disc/Drum proportioning valve on the disc/disc setup would cause that because the drum brakes require residual pressure, and the disc/drum prop valves provide that. So if he didn't change it, then the rear discs are holding line pressure. You should also check the rubber lines on the rear. DLB |
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07-25-2007, 08:48 AM
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#3 |
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Senior Member
Join Date: Dec 2005
Location: TN
Posts: 2,448
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Re: Disk brake conversion
That is exactly what has happened. It is keeping pressure on the caliper.
__________________
1947 International KB-1 1957 Chevy Bel-Air riding low 1962 swb fleetside 2002 Chevrolet Silverado 7-inch lift on 35 Daily driver 2016 Chevy Tahoe Better halves ride |
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07-25-2007, 11:56 AM
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#4 |
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Old Skool Club
 
Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: Disk brake conversion
Does it have an adjustable proportioning valve? If so, you will just have to play with the adjuster after making "panic" stops until you find the right setting that keeps the rear from locking prematurely or until all four lock at the same time.
If it isn't adjustable.....you will need to get one.
__________________
Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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07-25-2007, 05:12 PM
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#5 |
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Registered User
Join Date: Feb 2001
Location: Savannah, MO.
Posts: 513
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Re: Disk brake conversion
That sounds like what is happening. So I just need an adjustable proportioning valve? Any ideas where I can get one??
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07-27-2007, 11:24 AM
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#6 |
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Registered User
Join Date: Feb 2001
Location: Savannah, MO.
Posts: 513
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Re: Disk brake conversion
TTT......has anyone ever bought one of these adjustable proportioning valves??
Thanks!!! |
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07-27-2007, 11:58 AM
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#7 |
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Licensed to Thrill!
Join Date: Apr 2006
Location: Northwest, GA
Posts: 1,673
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Re: Disk brake conversion
I would NOT get an adjustable if it were me.
This is just personal preference though. Correctly speaking - the adjustable ones are truly the proportioning valves. The fixed ones that you can buy are called combination valves. Proportioning valve is just the "generic" name for all of them. I'd just pick up a disc/drum combination (proportioning) valve from any vendor. I think Mike's Bump and Grind Garage is about the cheapest. He also has aluminum. http://estore.websitepros.com/126980...-GM/Detail.bok He's a board supporter/vendor. That's where I got mine - and all the vendors buy them from the same supplier. DLB DLB |
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