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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: May 2001 Posts: 1,907 'Bolter | | 'Bolter Joined: May 2001 Posts: 1,907 | I installed a dual reservoir master cylinder in my '48 18 years ago. The MC was originally for a 67-70 Chevy (NAPA 36239). The bracket was from CPP. The adjustment of the plunger rod has always been incredibly touchy.
If the plunger rod is screwed in a bit too far by maybe only one fine thread, the brake pedal will rise while driving and braking and possibly make the shoes to drag badly, possibly a lot.
If the rod is screwed out a tiny bit too far, the brake pedal will go almost to the floor (but still stopping).
It's really hard to find the happy medium.
Any ideas? Wrong MC?
1948 3/4-Ton 5-Window Flatbed Chevrolet 34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
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