I am installing a Mosier 12 bolt in my 91 RS. With this I am installing Wilwood rear disc brakes. My question is... what position should I mount the calipers (front of the car or back of the car)? I have the passenger at the 9 0Clock position as you are looking at the tire. I have to rout the lines infact I think I am going to bend the lines custom.
The parking brakes are both facing forward if I clock the calipers twards the rear of the car.
Thanks I am at a stand still till I hear from you all.

 

Mount so the bleeder is at the highest point.

 

Most modern Wilwoods have bleeders on both sides.

I would clock them whichever way makes it easiest to run the parking brake lines.

 

Thanks I mounted both of them towards the rear seeing that they have 4 bleeders not all of them can point up.

 

With the new upgrades do you think I should put a bigger master cylinder in and a new prop/combo valve?

 

It depends what you want from your brakes. Compared to stock, do you want:

longer or shorter pedal travel?
more or less pedal effort?

What is the piston size on your front and rear brakes?

I always recommended an adjustable prop valve.