The stock master cylinder is not reusable in the Hydro-Boost, and was designed as a cheat for the lack of power coming from the vacuum booster. You no longer need this, and can convert to a more conventional straight bore master cylinder. With the stock front brakes, any of the 1-1/8" bore master cylinders offered will work, and it is mostly your choice on finish between them. If you have 3/4 ton or 1 ton axles, or brakes from something else then let us know as that might change the master cylinder options.
We used to offer the pedal, but it is obsolete now. You can source one from a ĺ ton or 1 ton from a similar year, or we can just set it up for the brake pedal you have now. We can do it either way, you just want to let us know which one you are going to use as one setup is offset, and the other is on center, and the booster wonít line up if it is paired with the wrong brake pedal.
Rear Brake Upgrade:
On most vehicles, the stock rear drums are fine and are being under utilized. They have more potential, and the hydro-boost will increase the pressure going to them, which is a better place to start than by converting from rear drum to rear disc. Since caliper pistons are much larger than wheel cylinders, changing to disc can just make things worse if you didnít have the power already to work the brakes you had, as the new calipers will be more demanding. The rear brakes on these 90ís GM trucks were weak though, and we do recommend converting to rear disc, or at least buying the rear wheel cylinders that we offer that will balance out the braking distribution so that you arenít just burning up front rotors. Just check to see if you have the wheel cylinders with the bleeder screw level with the two mounting bolts, or if you have the ones with the bleeder screw offset. We only have the larger wheel cylinders for the drums with the bleeder screw level with the mounting bolts.
It would be a great idea to convert to rear disc on these trucks, but the hydro-boost will be about $800, and the rear disc might be another thousand. If you donít have all the money in the world, then the Hydro-boost is the place to start as it will be the thing you need to make your stock brakes work, but if you convert to rear disc, then you will need the hydro-boost anyway as it will be the thing you need to make the bigger brakes work since they will require more pressure to work correctly.