'57 w/power brake and 3 speed manual.

[rhiggins77]

Anyone know why this cars idle increases when it is stopped and your foot it on the brake? Get off the pedal and it drops to normal.

 

[tbird5866]

I can only guess that it's sucking air from the power brake booster.

 

[rhiggins77]

My error. The idle DROPS about 200 rpm with brake applied at stop. Blown power steering booster?? No leaks and master cylinder is full.

Thanks

 

[tbird5866]

I think you probably have the answer. Bad booster.