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Hello, I am an owner of a 1991 Bronco. I have had this truck for a little over two years now. Knock on wood it has been very reliable. But here recently when I put the truck in gear but have my foot on the brake it starts to vibrate. It feels like it is right under my seat. Ive tried to look under while someone is holding the brake but I cant see where this vibration is coming from. And I dont know if this related but when I am on the freeway it starts to vibrate but at crusing speed around 45 mph you dont feel the vibration. Anyone have any ideas??? Please help
 

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Check your motor mounts - open the hood, and look at the engine while holding the brake and depressing the accelerator slowly. If the engine rises up on the drivers side, your motor mount(s) has failed.

Also check to see if a piece of the exhaust system is hitting the body, or a catalytic convertor shield has loosened and is hitting the body.

Welcome to FSB
 
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