So a coupla questions arise....
1. Is it a huge deal to change booster size in this application?
2. How critical is it to match the master cylinder and brake booster to the calipers?
3. Am I correct in that the booster size dictates the pressure to the calipers and if so is my answer dependent upon what I intend to haul with the truck?
a bit more clarity of the configuration, Front disc: '79 , rear drums: '66
Last edited by Spyderjohn; 04-17-2012 at 01:00 PM.
The '66 Bendix vacuum booster in F100"s was 7", which was matched to the '66 drum/drum setup. M/C had a 1" bore. Bore size also affects braking, altho' in 1966 both manual and power assist brakes used the 1"
Booster got larger as years went by. There have been several articles written on later model truck and hot rod forums about matching booster size with braking capability at the wheels.
With regard to booster size, remember if you get too large, esp. with a 352 V-8, you will have a hard time getting the left valve cover off, altho, you can probably put that 8" on there and get by.
As I recall, a dual diaphragm 8" yields same power as a 9" single