brake pedal
Elder User
Joined: Oct 2004
Posts: 984
Likes: 0
From: Winnipeg, Manitoba
I would suspect either the m/c or the vac booster.
One thing you have to remember is that vacuum increases to large volume on deceleration, and will overcome a minor leak in the system until at a dead stop. Once at a dead stop, with the engine just idling, it will cause the pedal to fall. I had that happen to me on my 69 4x4, and all other brake parts were brand new with the exception of the vac booster. I replaced that and it ended the pedal fall. That was just after the front disc brake comversion on that truck.
Either one could be suspect.
One thing you have to remember is that vacuum increases to large volume on deceleration, and will overcome a minor leak in the system until at a dead stop. Once at a dead stop, with the engine just idling, it will cause the pedal to fall. I had that happen to me on my 69 4x4, and all other brake parts were brand new with the exception of the vac booster. I replaced that and it ended the pedal fall. That was just after the front disc brake comversion on that truck.
Either one could be suspect.
