68GTcarrie

Been driving on new drum brakes for about 2 weeks. Its been 10 years since I last owned a car with drums so not sure if this is normal.

My brakes are nice and stiff, stops great, no change in initial pressure EXCEPT when sitting idle with brake pedal pushed... slowly the pedal loses pressure but never to the floor and never to the point of losing brakes completely and rolling.

No fluid on any rims, fluid full...

Is this normal behavior? Perhaps if I sat long enough with pedal pushed pressure would kick back in? But it stops short of the floor and like I said, never further.

Saw a similar question but they lost pressure and thru the car in reverse, yikes. Difference is, my brakes dont roll the car forward, I just push harder and the pedal eventually stops losing pressure.. seems to be the same place and not getting worse.

Thanks!

Starfury

Hm. Do you have a power booster?

Option 1) Power booster is bad and sucking the pedal down.

Option 2) The cup seal in the m/c for the first bowl (rear brakes) is nicked and bypassing, allowing the pedal to sink until it mechanically hits the second piston/cup, stopping the pedal from moving.

68GTcarrie

Thanks for the fast response..

No power booster, I'll check on Option 2 tonight and post

Thank you

68GTcarrie

Thanks for the fast response..

No power booster, I'll check on Option 2 tonight and post

Thank you

Starfury

Forgot to add, #2 should kick on your brake warning light. However, after 40 years, many of the switches get stuck, bulbs get burned out, wires fray, etc.