40 ford with mustang master cylinder

M

my40ford

Member
Put a speedway disc brake setup with a 1967 mustang m.c. Bought the adapter to make it fit, what pushrod length should be used?
 
I had to cut off about 1/2" from the stock pushrod to make mine work. 1939 pedals with adapter to 1967 Corvette m.c. A little trial and error and measuring and you'll get it.
 
No one is able to predict an accurate length for your pushrod without taking accurate measurements of your particular pieces, along with the final, as-mounted position of the brake pedal in it's fully retracted position at it's upper stop against the floor. Once all these pieces are permanently mounted, and the pedal is in it's fully-retracted position, the rod should be finalized at a length which would allow approximately 1/16" of free movement between the end of the rod and the plunger. DD

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Every brake manufacturer said to have the 1/16" freeplay on my '41 M/C rod. That translated to a BUNCH of free pedal, enough to be scarry. I used a modified '41 adjustable rod to finalize the length by adjusting the rod, with the pedal fully up, until the M/C piston retracted past the compensating port in the M/C. That gave me about 1" free pedal,good brakes and no brake drag
 
Good advice so far, but I'm a tad concerned about which m.c. you acquired. '67 Mustang cylinders are often cited as "ideal" because it's the first year of dual chambers AND both disc and drum brakes were available. If you got the drum brake m.c. you may be marginal on volume of fluid available for discs. You didn't specify which m.c. you spec'd.
 
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