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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Aug 2001 Posts: 44 New Guy | | New Guy Joined: Aug 2001 Posts: 44 | I am converting my 51-3100 to front disc brakes, keeping rear drum brakes. I bought a dual mast cyl adapter from chevy duty, but they couldn't tell me what master cyl to use with it. Is a proportioning valve required? Is there any tips or problems encountered with this conversion? Would appreciate hearing from you.
41 Chev 2dr coupe
51 3100 w/a 261
11 Camaro RS ragtop
| | | | | Joined: Sep 2002 Posts: 438 Shop Shark | | Shop Shark Joined: Sep 2002 Posts: 438 | Alan-
Way to go on the conversion. I am not an expert, but am in the process of getting a early 70's Nova drum-drum system in line. You'll need a master that can accomodate a residual valve for the rear drums. However, if the master is a dual chamber design, I do not THINK you need to proportion valve the whole set up. Other experts should affirm or contradict me on this point!
Consider master cylinders from vehicles with similar systems. My window is narrow, but there were certainly 70's GM cars with the disc drum set up. These are available from your local parts stores or other performance sellers, including Chevy Duty. Also, consider calling any of the brake upgrade folks for additional info (such as ECI, MP Brakes, Classic Perfomance, etc.) I had good experiences with ECI and Classic Performance.
Good luck! | | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | A lot of good info on this brake facts site. | | |
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