Correct Master Cylinder

[HPCOBRA]

Hello to all and thank you for all of your previous info. Especially to all the feedback from DV. I have asked several questions about brakes, but I believe I have not been clear enough on my dilemma. My car has a standard transmission with the standard CR pedal setup offered in about 1993. From the center of the brake pedal output shaft to the edge of the hydraulic clutch pedal master cylinder is about 3.12 inches. In other words I only have about a 6.25 diameter area for a booster to fit for power brakes. My calipers at the wheels are GM disc brakes that fit a 1988 corvette. I was told by the supplier of the brakes that the calipers need about 1000 PSI at the wheels. Does anybody have this same setup and what did you use for a master cylinder and booster? I would go with non power brakes if there was a MC that could give the correct PSI without using two feet to stop! Any info or pics would be much appreciated.
Thanks

[tcrist]

According to the manual, you can use the complete power brake setup from a 1975-1978 302 v8 mustang II. It also says to use a 9" booster.

I have the stock 9" booster on mine with Wilwood disks front and rear with Wilwood master P/N 260-8556.

Mine will stop on a dime and give you 9 cents change.

[HPCOBRA]

I know the manual calls for that, but my master cylinder to my clutch is only 3 1/8 off the center line of the where the brake master cylinder sits. I only have an area that would accept a 6.00 dia booster. If I had an automatic with no clutch, the area would acept about anything.. I could fabricate a bracket to extend the booster mount beyond the area taken up by the clutch master Cyl. This would allow me to uses a bigger booster, but my brake rod would have to quite long to go from the pedal to the booster. It would be exposed and unsupported. This just feels unconfortable..

[tcrist]

I see what you mean. Mine is 5" horizontal and 4" vertical from the center lines(cable set up).

I know that they make a 7" booster but that will not help you either. Sounds like you need to call someone like Wilwood (or whomever) and get some info from them.

Sorry that I could not help.

[MaSnaka]

HP,
You could forget the booster and change your pedal ratio to 6 to 1 and live without power brakes. That's what I did at minimal cost and brakes work fine. I had to modify my pedal and changed to a different pivot hole in the pedal box (hole was already there) and I made the push rod adjustable for the perfect pedal hieght. Check my gallery for some pictures of the mods.

John

[Double Venom]

John,
Why did you do away with the Booster? Inquiring mind- would like to know?
DV

[MaSnaka]

DV,
I didn't explain myself well enough, sorry. I had no booster but did have the 3.5/1 pedal ratio. I'm the 3rd owner of my car and there was never a booster installed. But the brake pedal ratio was designed for the booster as it was and I changed the ratio to 6/1 instead of adding the booster. Brakes work well but I doub't I could give you change from stopping on a dime like Terry can.

John

[Double Venom]

Ahh-so!
The brakes had to be horendous before your mods!