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04-20-2020, 01:19 AM
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#4 |
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Senior Member
 
Join Date: Jul 2000
Location: North Texas
Posts: 4,035
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Re: Proportioning valve vs No valve
For manual brakes the factory used a master cylinder bore of just under 1 inch (25 mm, I think). At least that was true for the 82 model C10.
If I were going power to manual, I'd probably do 15/16". And if you plumb in a manual prop valve, you can fine tune the system so the rears don't lock up prematurely. BTW, for me this would be the ultimate kit. I had the 7/8" version on a 55 Chevy car with entry-level Wilwood front brakes and 9"x 2" rear drums. Worked great! Move down the page to see the 15/16" and 7/8" part numbers.https://www.wilwood.com/MasterCylind...%20and%20Valve 
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Mike 1969 Custom/10 LWB -- owned for 37 years. 350/TH350, 3.08 posi, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. Hedman stainless headers. Old Air installation in progress. 1982 Custom Deluxe 10 SWB -- converted from 250-six to roller cam 350 w/ Vortec heads -- sold 1981 C10 Silverado LWB, 305, TH350C -- sold, but wish I still had it! 1969 C10 (not the current one) which I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 26 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! Last edited by MikeB; 04-20-2020 at 01:24 AM. |
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