[Captainfab]

I can't say for sure but that master cylinder looks like those I have seen on Motorhomes built on the 1-1/4 ton chassis. They have a rather large bore, something like 1-1/4". That will make the pedal a little harder to push. The other thing is that it may or may not be plumbed correctly. They have the front port of the master to the front brakes. With some masters that is correct and with others it is not. That is something that should be checked into.

As for upgrading to power brakes on a budget, I sell my standard booster brackets in bare steel for $55.00 plus $12.35 for shipping. Then you can simply go to your local wrecking yard and pick up a compatible booster and master cylinder. Going this route is simple and also ensures that the booster and master assembly is securely attached to the brake pedal assembly as the GM engineers designed it to be.