Vibration in rear while braking
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Joined: Nov 2010
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Vibration in rear while braking
I need some help. I have a 1978 F150, with a factory installed 460 (be surprised how people say I installed it). Anyway, when I brake I get a vibration between 25 and 40 mph in the rear of the truck. It feels like the back of the truck is bouncing right of the road. I rebuilt the brakes about 4 years ago. But this started in the past year of so. You name it it was replaced, except for the hard lines and the proportioning valve. I don't feel any vibration in the steering wheel or in the brake pedal. But diffinitely in the seat... and rear of truck. I had the transmission rebuilt, and the rear u-joint was replaced (lost the caps). The guy said the front one was fine. I had a retired Ford mechanic look at it and said there was nothing physically wrong with the brakes. He couldn't explain it. He took it to a frame shop and they couldn't find anything wrong. I have recently replaced the rear wheel cylinders and had the drums turned. I have fairly new magnum gasmatic shocks on it (put on before the brakes). Any ideas?
Fleet Mechanic
Joined: Feb 2007
Posts: 1,326
Likes: 48
From: Middle TN
It sounds like the drums are warped. This can happen by driving with the e-brake slightly on for a short period of time. Usually you can just turn them and take the warp out of them. I would carefully examine the e-brake cables to make sure they are completely releasing.
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