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Jul 21st, 2025 | | | | Joined: Dec 2016 Posts: 165 'Bolter | | 'Bolter Joined: Dec 2016 Posts: 165 | I'm upgrading my master cylinder on my '55.1 Chevy p/u 3100 from original m/c to the dual m/c. I've acquired a drum/drum m/c to install, but I'm having a hard time determining if proportions and/or residual valves are needed or should be used. Placement of my new m/c will be the same place using the bracket I got from Precision On Line (POL). Please advise.
S2
Stewart2
1955.1 3100
Both Owner and P/U have lots of miles, lots of history and need LOTS of TLC
Jack of several trades and experiences; Master of none
| | | | | Joined: Apr 2005 Posts: 2,066 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,066 | Proportioning valves are normally not required on drum/drum applications. Most master cylinders for drum/drum
applications should have an internal residual valve. Check with your supplier. However, they may not know as many
just push parts out and don't know the technical aspects of their products.
Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
| | | | | Joined: Dec 2016 Posts: 165 'Bolter | | 'Bolter Joined: Dec 2016 Posts: 165 | Thank you, Fred! My new master cylinder is a CPP (Classic Performance Product) and, according to their response on the web, they do have an internal residual valve. I just didn't think about it having an internal one. So, thanks again!
S2
Stewart2
1955.1 3100
Both Owner and P/U have lots of miles, lots of history and need LOTS of TLC
Jack of several trades and experiences; Master of none
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