Classic Mustang Brake Question

[FastSVO]

Tonight I started replacing the stock front drums on my '67 Fastback. Now for a long time, my LH wheel cylinder has been leaking and steadily my braking power and pedal obviously has degraded over time. Well, I jumped in the car to pull it around and soon as I put my foot to the brake pedal, it went straight to the floor with no resistance. I tried adding fluid and pumping the brake pedal to see if that would help, but it didn't.

I am now in the middle of changing my front shoes, drums, and wheel cylinders, but could my master cylinder also have failed? I do have a manual disc brake master cylinder off a '74 Maverick that I could use, but would it work with my stock 4 wheel drum brakes? Would the increased bore size in the Maverick unit make the pedal harder to depress?

Sorry for all the questions and thanks in advance.

-Eric

 

[streetgrande69]

You can't not use a m/c on a drum car that is out of a disc car! You have to have a residual pressure valve for the drums and ever since the disc m/c you want to use doesn't have it for the front circuit, you can't use it unless you get an external residual pressure valve. Plus the disc/drum has different size reservoirs, primary/secondary spring rates, and different volume displacement characteristics.

The master is probable just recirculation fluid into itself, that could be why you have no pedal. It you just put the m/c all the way to the floor, you would be doing good to just replace it, its cheap and a good reassurance too.