ADJUST BOOSTER

[RONM]

Suspect my brake booster needs to be adjusted where it meets the
master cylinder.I have some free travel on the pedal before the brakes
react and overall stopping force seems diminished(can not lock them up).
I have the spec from the manual but my concern is how to take the master
cylinder off to check and adjust.The manual states to just unbolt from the
booster and pull off and up but the master clinder is really close to the shock
tower.Will this work or can anyone with experience tell me how to do this?

 

[67coupe351w]

Your right, the master cylinder is extremely close to the shock tower. It will come out though. You have to disconnect the brake lines first and then loosen the 2 bolts holding the master cylinder to the booster.

You may not need to remove the M/C though. Maybe you have some leaking calipers or wheel cylinders? If thats the case you would have a little bit of air trapped in the line at the wheels. this would be the easiest to check for, just inspect your wheel cylinders and see if any fluid has leaked out of them.

It is also possible that some of the fittngs at the master cylinder, or at the wheels could be a little loose.

Another thing thats possible is the master cylinder is leaking out of the back end of it where the piston is. Mine was doing this, I removed the C clip and pulled the piston out..there was some build up in the bore which I honed with a peice of sand paper and it hasnt leaked since.

 

[RONM]

THANKS

Thanks for the info 67 coupe.I should of mentioned that the wheel cylinders
and calipers are fairly new and have checked them twice for leaks.Also no
fluid lost at master since I've driven car and I have bleed system twice to
be sure.Pedal holds pressure fine.I will remove the master and check the booster rod adjustment at least for peace of mind and post reply after.
Thanks again,Ron M.,68 Shelby GT 500.

 

[2nd Mustang]

Do you have rear drums? You may only need to adjust the rear shoes to help with pedal play. Becareful when adjusting the pushrod between the MC and booster, too much play will lock up your brakes and too much will drag the brakes.