[JLMounce]

Originally Posted by rasilverbird

I have OEM style front calipers but plan to replace them soon. Rears are "S-10 style"
My thought process is this: If I can make what I have work with a $250 booster, then I would rather do that then have $700 in a new master and booster.

You can do a 1" master with those calipers, but I still think I would prefer a 15/16" master on this. You'll have a bit more pedal travel, but I don't think you're going to notice that, or care given the reduction in leg force that will be needed.

Be careful changing the front calipers only and leaving the metric calipers in place. You may find that you create a pretty large bias imbalance as most of the aftermarket stuff from Wilwood and Baer will have smaller piston area. If you are planning on doing new calipers as you state, I'd probably go with the 15/16" MC instead of the 1".

If the car is a street car, or drag car, a 7/8" master can also be used. The pedal will get kind of long, but it'll be much easier on the leg. For things like auto-x where there's a lot of braking, the 7/8" is problematic just because of the amount of pedal travel you end up having to overcome. You're better with a stiffer pedal and shorter pedal travel.