Manual disk brake master cylinder

[gick70]

What vehicle out of ,would fit my need…….I want manual dual disk brake master cylinder

 

[thegreatjustino]

I'm using one from a late 70's Lincoln Continental Mark V. If you want to get technical about it, the Lincoln had power brakes which typically indicates a larger diameter master cylinder piston. I like the heavier pedal feel, so no issues for me. This will depend on your preferred feeling for manual brakes.

 

[Apogee]

To properly spec out a master cylinder, we would really need to know what you're actually running in terms of brakes. Ford versus GM, standard versus oversized calipers, rear disc brake solution since that's clearly aftermarket, etc. Weirdly, Ford Bronco's are some of the few applications that received the same bore size master cylinder (Ø1") for both manual and power brake applications, drum/drum or disc/drum.

 

[DirtDonk]

I ran a stock 71 master cylinder with Ford front disc brakes for many years. Loved the action, pedal feel, and braking capability.
Only modification I had to make was to remove the existing residual pressure check valve from the front brake circuit.
Most replacement master cylinders no longer come with the RPV, it seems, so that might not always be necessary.

 

[DirtDonk]

There is not always a difference between a disc brake and a drum brake master cylinder.
They both pump fluid.

In the old days, a difference might be the rating on the residual pressure check valve. Typically two psi for discs, and 10 psi for drums.
But even those were a hold over from when master cylinders were often mounted under the floor, on the frame, and brake fluid could literally gravity feed back into the master.

 

[DirtDonk]

Another difference was the size of the reservoirs increased as disc brakes became more prevalent.
Even though Broncos didn’t get dics until 76, you could see the change in master cylinder design between 70 and 71, when Ford went to the more common one we know with the larger reservoir for the front brakes.

 

[ntsqd]

Years ago, when I was working in brakes, my mentor worked out a simple method of selecting the m/c bore size. As Apogee noted, we need to know what brakes you're using and it wouldn't hurt to know what you want in pedal feel.