Heads up to those that install a 2 bolt aluminum master cylinder.

Typical mc the rear piston does not come in physical contact with the front piston, it builds pressure between the two pistons, and hydrolic pressure applies the front piston. If you have ever noticed one resivour go down in level and the other rise, that indicates a bad part in the MC.

BTW there is an aluminum 4 bolt stock looking MC available.

Also 1 1/8 is huge as compared to the 1" stock to 15/16 pistons.

That alone could account for the increased foot pressure needed to stop.