My rear mas. cyl. resivor (for front brakes) has been running low latley. When it sits for a night I come out and the thing is almost dry. There is no visalbe leaking, could it be sucking it into the booster? If so what do I do? There's nothing quite like slamming on your brakes, hitting the floor, and not stopping. I need help fast...

EDIT: I just found a leak under the master cyl. dripping down the booster. It there a seal here that may have gone bad? What's needed to fix this, the master cyl. is new (two months)

-Matt

 

Sound's like the rear seal in the master cyl. is bad. see if you have any kind of warranty where you bought the master cyl. because you will need a new one. best of luck, Tom

 

How hard is the rear seal to replace? How about the whole M.Cyl.? I'm going through brake fluid like water!