Don Terrill’s Speed-Talk

If it's for a FOOT brake, a hole in the floor will suffice, ...stopping power is relative to co efficient of friction material

I think, now I think that most vehicles brake pedals have two holes in them.

A top hole for non power and a bottom hole for power. Look close and I figure that you will see where we can install a booster setup for the lower hole on the firewall and no booster up top for the top hole. The firewalls should have the needed extra studs already in place for a booster if not mistaken.

Find a vehicle that is sized/weighted like you want to use and measure away imho...

I have a really old mag that said to use a 1.25" diameter master cylinder for a four wheel disc, "cheap big brake" setup like I now have on my car because of the large capacity 1969 and Van 2-15/16" dia. big single piston front calipers and the something like 2-3/8" dia. 1980 e-brake Cad Seville rear calipers. Worse thing that can happen is that I may have to use a smaller bore M/C if my pedal pressure is too high?

FWIW, I have another old mag that lists all of GM's front and rear disc brake sizes and vehicles and years used on info....

I created a front caliper template that mounts the 2-15/16" caliper on a 1988 13" 'Vette front rotor and have given copies of it away to a bunch of guys through the years. Do a search on both T/C's for pdq67's CBB front and rear install if you want. It might be under pdqCBB???

My rear rotor on my 12-bolt rear end is a 1989 Camaro 12" dia. rear one... Custom caliper bracket for it too....

pdq67

pdq67, a smaller bore m/c will increase pressure and takes a longer pedal push.

Most car brake pedals now only have one possible connection to the master cylinder, because they're all power assisted, and there is not even any provision made at all for a non-power-assisted-brake version.

Brian P wrote:Most car brake pedals now only have one possible connection to the master cylinder, because they're all power assisted, and there is not even any provision made at all for a non-power-assisted-brake version.

What! - i thought the current mustang was still stock with 4 wheel drums!!

I'm sorry guys, I'm thinking our old pony and muscle cars, (and older), here.

Please carry-on.

pdq67

Quite a few of us here are into "old iron".
Hot rods, muscle cars, that kind of stuff.