Gold Lifetime Member
Join Date: Jul 2009
Location: casselberry, fl
Power booster push rod to master cylinder piston clearance ???
How much, if any, clearance should there be between the push rod of the power brake booster and the end of the pocket in the master cylinder piston with the master cylinder bolted tightly to the power brake booster?
It is the original power brake booster with it's original push rod (the long style). I have a new master cylinder and when I push it as far as it will go on to the booster, the mounting flange of the master cylinder will not sit tight to the mounting surface of the booster. There is a 1/16 to 1/8 inch gap. I can rock the master cylinder side to side. It's pivoting on the push rod.
If I tightened the mounting bolts, the pushrod would push the piston in that 1/16 to 1/8 inch......By the way, the old master cylinder that I took off (not the original) fits tight to the booster so apparently, the piston pocket is a little deeper in that one.
I am probably not going to be using this new master cylinder and getting another one for reasons I won't go into here but I am still curious as to what the proper fit of the push rod and piston should be.
1968, 327 210 HP, Power Steering, Power Disc Brakes, Custom Interior, 4 Speed, Console, Gauges, Tilt Wheel, Speed Warning, Fiber Optics, 10 Bolt 3.55 Posi Rear end......Owned since 1978.