Brake Problem
Thread Starter
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Cross-Country
Joined: Sep 2000
Posts: 75
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Brake Problem
This is on my 1991 F250 4x4, 300ci 6 cyl, air, ZF tranny. Well I backed a trailer into a dump pile to get rid of tree limbs. Wasn't in far enough to snag a brake line. Yet when I did, the brake pedal went to the floor. Didn't do anything weird, just hauled 2 loads of limbs on a trailer. Got out and the master cylinder was nearly dry. Filled it and got back in, pumped it a few times. I can hear rushing air when I pump the pedal. Cylinder was again nearly dry. Cannot see any leak anywhere. 
I assume that it's the master cylinder and since I cannot see any leak, that it's going into the vacuum booster. Ideas? How can I easily check that?
Thanks
Carlos
I assume that it's the master cylinder and since I cannot see any leak, that it's going into the vacuum booster. Ideas? How can I easily check that?
Thanks
Carlos
Elder User
Joined: Jan 2002
Posts: 555
Likes: 0
Brake Problem
Have a look inside the cab right into the firewall where the brake pedal goes to the booster. You may find brake fluid there which will answer your question. I have seen this many times on the Ford. Just curious....which side of the master is going down? The large one or small one?
Thread Starter
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Cross-Country
Joined: Sep 2000
Posts: 75
Likes: 0
Brake Problem
The big side is nearly dry and the little side sure doesn't look like it's got much in it. I might have enough brakes to stop the truck from 3 or 5 mph, but that's being optimistic. I try to look tonight and see if I can detect anything in the cab. There's got to be about 2 pints of fluid somewhere. 
