No magic here. Just go to your local Autozone, Discount Auto, etc. tell them '66 Chevy, power brakes, whatever engine and trans it has, so they can plug it into their little computer, and they will pull the right M/C for you. You will probably get 3 or 4 choices as to warranty (lifetime, etc)

Replacement is a cinch. Put the new one in a vise with fluid in it, they give you a couple hoses to use as bleeders, follow the instructions, and keep pumping until all bubbles disappear, and you are ready to install.

Use correct sized line wrenches to remove the old lines, while the old M/C is bolted in place (if you have none, buy at least one properly sized line wrench so you don't bugger up the fittings........usually need two sizes) Once the lines are off, quickly unbolt those two bolts onto the booster, and slip the new one on and bolt it down. Then screw in the two lines into the correct holes, and tighten down snugly.

You have pre-bled the M/C in the vise, so most of the air should be out. Sometimes this will do it, sometimes you have to bleed it more at the wheel cylinders. You may luck out. On a one to five scale, five being the most difficult, this is a two.

If you don't feel comfortable doing it, don't. Brakes are nothing to mess with.

Also, the leaking fluid may have wiped out the booster, maybe not. Buy a quart of fluid, you will need it.

Good luck,


Don