Question: With reference to an ordinary tandem brake master cylinder with a straight bore but without some internal proportioning valve, and an intact brake plumbing system -- is it safe to assume that the pressure output from both the front and rear ports would be about the same?

I ask this because I'm working on a brake system that has a brake pressure gauge hard-plumbed into the brake system, but it is only in the front brake circuit.

Thanks in advance!
Troy

Not on mine, my rear calipers are larger with more pad surface and 200-250 less pressure than the front. Still 950 rear and 1200 front. My tandem master ( factory Mopar style). The front brake line goes to the rear brakes.

Thanks, man. Do you have a proportioning valve or something to reduce the pressure to the rear? I take it then that you have more caliper piston area on your rear brakes? Would that be to balance big slicks then?
Thanks again,
T.

No proportioning valve in the system. Skinnys in the front and 15X33's on the back.

I am using a modified Mazda strut with stock brake components in the front. The rear are gm metric calipers and wilwood rotors. The metric calipers are just bigger than Mazda stuff. Wilwood knew all the surface areas for both front and rear when I called them. They were very helpful even though I am not running their brake kits.

Thanks, man.
Troy