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71 Cuda Booster rod to master piston clearance

Posted By: isettakurt

71 Cuda Booster rod to master piston clearance - 08/18/23 03:48 PM

Hello,
I have a 71 'cuda power disk brakes with a Midland Ross direct mount booster. What is the clearance for the booster rod to master cylinder piston. Thanks
Posted By: moparx

Re: 71 Cuda Booster rod to master piston clearance - 08/18/23 05:54 PM

i believe it's around .020-.030
beer
Posted By: DAYCLONA

Re: 71 Cuda Booster rod to master piston clearance - 08/22/23 11:11 PM

Originally Posted by moparx
i believe it's around .020-.030
beer




For a GM product that would be the norm, but Chrysler's seem to work well with .060 (1/16 inch) clearance......
Posted By: moparx

Re: 71 Cuda Booster rod to master piston clearance - 08/23/23 05:44 PM

Originally Posted by DAYCLONA
Originally Posted by moparx
i believe it's around .020-.030
beer




For a GM product that would be the norm, but Chrysler's seem to work well with .060 (1/16 inch) clearance......



thanks for the clarification. up bow
after flipping through a couple of FSM's, all i could find was the booster rod length from the master cylinder mounting surface at the booster to be .910-.920. there was no mention of clearance between the booster rod and the master cylinder piston bore depth.
not having a master cylinder handy to measure the piston bore, i didn't have a reference.
beer
Posted By: stumpy

Re: 71 Cuda Booster rod to master piston clearance - 08/23/23 07:59 PM

Wouldn't that be figured into the length?
Posted By: moparx

Re: 71 Cuda Booster rod to master piston clearance - 08/23/23 08:20 PM

Originally Posted by stumpy
Wouldn't that be figured into the length?



i would assume [everyone knows what that word REALLY means biggrin] so.
but not having a master here to measure the piston bore depth, [in my machinist tools, i have a "round bottom" stem set for my depth mics] i can't come up with the clearance that booster measurement would create in the master cylinder piston bore.
beer
Posted By: TJP

Re: 71 Cuda Booster rod to master piston clearance - 08/23/23 11:37 PM

I made mine as they weren't so cheap and available years ago LINKY As for the clearance question,.030 should be adequate .060 IMO is a little to much but better to have enough than not enough. Do keep in mind more clearance leads to more pedal travel before braking begins. How much? depends on a number of variables. I usually shoot for .030 - .040" and call it good. twocents beer
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