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09-17-2009, 01:06 AM | #1 |
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Join Date: Aug 2002
Location: Valley Center KS
Posts: 3,524
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3/4T power brake question
I'm upgrading my 69 GMC 3/4T (aka No Buck) with a power brake booster.
So far I have the power brake booster and master cylinder from a 72 3/4T. (Along with the proper brackets, linkage, etc. As of right now I am not changing to front disk brakes, so should I use the 72 power disk/drum proportiong valve or the 69 manual drum/drum prop valve? I'm thinking the drum/drum prop valve. However, it seems the brake lines coming out of the MC are flipped. I can hook up the drum/drum prop valve pretty easily by flipping it upside down, but is this going to cause me any problems? Thanks |
09-17-2009, 04:59 AM | #2 |
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Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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Re: 3/4T power brake question
All you want to use is the booster itself, the master cylinder and prop valve are all wrong for drum/drum setups, you will need to reuse your old master and the distribution block (it's not a prop valve on drum/drum). There may be some length issues with the rod that pushes the MC, you will have to double check that else the brakes won't apply or be on all the time.
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09-17-2009, 10:13 AM | #3 |
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Join Date: Dec 2006
Location: Porter Ranch, CA
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Re: 3/4T power brake question
Yeah, if you use the drum/drum set up, all you'll have to do is THINK about hitting the brakes and the a** end will lock up on you! From what I've heard, using the disc/drum setup will help this. I used an inline proportioning valve. It worked, but the pedal always had a funky feel to it.
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09-17-2009, 11:45 AM | #4 | |
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Re: 3/4T power brake question
Quote:
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09-18-2009, 12:52 AM | #5 |
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Join Date: Jan 2007
Location: Topeka,KS
Posts: 778
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Re: 3/4T power brake question
Agree with keeping it the same until you upgrade. But it's the discs that require more fluid. It's the size of the piston. The large rear portion of the reservoir goes to the front discs. The front disc lines are larger also. I think you need some R&R Wes. Last edited by airdale94; 09-18-2009 at 01:02 AM. Reason: add |
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