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10-25-2018, 12:13 PM
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#1 |
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Registered User
 Join Date: Apr 2011
Location: Vacaville, CA
Posts: 148
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Proportioning Valve
Has anyone found a proportioning valve that works on an all drum power brake system?
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Make it a great day! Mike |
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10-25-2018, 12:25 PM
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#2 |
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Post Whore
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,350
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Re: Proportioning Valve
Other than the factory one? What are you looking to accomplish?
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.  RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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10-25-2018, 12:36 PM
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#3 |
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Registered User
Join Date: Apr 2011
Location: Vacaville, CA
Posts: 148
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Re: Proportioning Valve
I have added power brakes to my 69 c10 and have drums all around. I guess the question is: do I need a proportioning valve and if so is there an after market one that will work as I don't have a factory valve.
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Make it a great day! Mike |
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10-25-2018, 12:44 PM
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#4 |
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Post Whore
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,350
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Re: Proportioning Valve
Did you change the master cylinder bore size?
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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10-25-2018, 12:52 PM
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#5 |
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Registered User
Join Date: Apr 2011
Location: Vacaville, CA
Posts: 148
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Re: Proportioning Valve
I bought the booster and master cylinder as a unit, the master cylinder is larger than the original.
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Make it a great day! Mike |
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10-25-2018, 01:11 PM
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#6 |
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Post Whore
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,350
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Re: Proportioning Valve
The factory used the larger (1/4") line to the rear brakes as a way of slowing the application of the rear brakes. That should still work for you. The best thing at this point is to find a safe area to do some brake testing and do some hard stops and see if the rears lockup too easily. If so then adding a adjustable proportioning valve will allow you to slow the application of the rear brakes. Willwood makes good products and they have nice one piece units.
https://www.wilwood.com/MasterCylind...CylinderValves
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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10-25-2018, 04:28 PM
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#7 |
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Senior Member
Join Date: Oct 2009
Location: Godley, TX
Posts: 17,975
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Re: Proportioning Valve
You shouldn’t “need” a proportioning valve in your setup. Factory only had a distribution block that was a safety feature (and is connected to your dash brake light). Proportioning, for lack of a better term, is done by the stock mc to some extent (and fine tuning the ol star wheels is a good idea as mentioned).
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10-25-2018, 05:11 PM
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#8 | |
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Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Re: Proportioning Valve
Quote:
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"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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10-26-2018, 07:44 AM
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#9 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: Proportioning Valve
All 4 wheels are drum brakes you don't need a proportioning valve as stated they all work the same way. The proportioning valve was for disc brakes up front and drums in the rear.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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