Need Some Guidance With Master Cylinder Sizes

[Bill D]

Front brakes: 94 Mustang GT
Rear brakes: 94 Mustang Cobra
Pedals: Wilwood floor mount 6:1 ratio

From what I can determine with the information available, which isn't much, I come up with 5/8 bore for the front and 3/4 for the rear.

Any help is greatly appreciated

Bill

[leon]

Can you use 94 Mustang master cylinder if not find bore size of it and get one the same bore size.
Hope that helps

[Bill D]

I have dual master cylinders. That won't work

[Tommy]

Bill D,
If no one with the exact setup you have comes by, perhaps this website can give you some insight: Brake Calculator

Eventually you will have to decide what combination of pedal pressure and pedal travel feels best to you. A smaller diameter master cylinder will reduce the amount of pressure you have to apply, but the pedal will have to travel farther to push enough fluid to move the calipers sufficiently. So in your case, you'd use the calculator to enter the fixed data (e.g., caliper diameter and pedal ratio), add the pedal pressure / travel you'd like and see what master cylinder diameter is required.

[jhv48]

Pose this question to the guys over at the FFR forum. They're more used to dealing with pedal geometry and bore sizing.

[Bill D]

Thanks Tommy. The calculator worked great. I came up with .73 for the front and .69 for the rear. I'll use .750 for the front and .625 in the back.

Cheers
Bill

[Cobra Chris]

Originally Posted by Bill D

Thanks Tommy. The calculator worked great. I came up with .73 for the front and .69 for the rear. I'll use .750 for the front and .625 in the back.

Cheers
Bill

I used 3/4 for both front and back and then just get yourself a willwood bias adjuster...