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

It could be as simple as it bleed out sooner. I also read the rear channel doesn't have a residual pressure valve in the aluminum master cylinders and the Iron ones do, could that cause a variation in bleeding?

See Post 28.

https://www.forbbodiesonly.com/mopa...ng-a-15-16-bore-master-cylinder.190237/page-2