Do the master cylinders vary between Sierra models?

The reason I ask is that my brake pedal is very hard with little movement, so was wondering with a slightly different sized MC I can get more pedal feel and a little more movement. I think mine was from a V6 model.

FYI I am running Wilwood front calipers and standard sierra calipers at the rear.

Cheers

Paul

Not sure about V6 models, but there definitely different ones used on 4cyl Sierras. Some are cast items, whereaas mine is a fabricated/welded item.

My pedal is pretty short travel and very hard, but I haven't driven it yet, so can't comment on feel or effectiveness.

Cheers

Nick