Question about Ford F-150

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When I apply the foot brake the truck shimmies, sometimes worse than others. I inspected the rotors and brake pads and they seem fine. If I use the emergency brake to slow down it does not happen which leads me to beleive it is in the front.What could be the causes?

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  • abjr301
    abjr301 Aug 19, 2012

    From your description, it sounds like the rotors are warped. Take them off the vehicle and take them to your favorite auto parts store. They can measure them to determine if they can be resurfaced and if they can have them resurfaced. It will cost you about $30 or less depending on the parts store,.



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First I would suggest to check the front rotors. Before replacing, remove the wheels and give them a good inspection. If you can get a hold of a magnetic base with a dial indicator, then you can check for warpage.

Next please check the rotors but there is a posibility that it could be your wheel bearings. to check jack front end up and try to shake wheel top to bottom if it does shake then your wheel bearings need replacin.

The first step is to insolate the braking system to determine if the rear brakes or the front brakes are the source of the shake. Once you've found which end of the vehicle's braking system is causing the shake you have to isolate each wheel. I've had brand new brake rotors and brake drums that were warped or had excessive run-out right out of the box. That is why you have to take the time to isolate just from which brake the shake is being caused by. Once you figure out which wheel brake rotor or drum may be the problem don't go right to the parts store yet for a replacement. Inspect the mounting surface that the rotor and/or brake drum set on. There can be no rust. All it takes is one flake of rust between the mounting surface and the new brake drum or rotor to cause a good amount of run-out, resulting in a shake when braking. So if the vehicle started to brake shake after the brake work, it is likely that you have a defective or damaged brake drum or rotor.

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Posted on Jun 18, 2009

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I have a 99' f150(2wd) that has the same problem, front end shakes while braking. I changed the right(passenger) side upper control arm( about $50 for the part), checked the brakes and rotors, and changed the left wheel bearings(inner and outer) but I still have the shaking.
But while the truck was up on jackes I tried to turn the wheels by hand(like I was making a turn) and i noticed that the "BALL" joints on the idler arm and the tie rod ends where very lose. the entire steering bar would twist when i put any pressure into turn the wheels. I'm thinking this may be the cause of the shaking. Tie rod ends run abou $30 each and the idle arm cost between $50 and $250, depending on which style is on the truck.when i get some extra money I'll start replacing the componets one by one. I'll repost my resaults when i do.

Posted on Aug 23, 2014

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  • Red neck
    Red neck Sep 07, 2014

    here's an update to what I've found or NOT found.

  • Red neck
    Red neck Sep 07, 2014

    Add a Comment I wire tied a gopro cam to the frame of the truck, first pointing towards the right side(passenger) front wheel. I wanted to see if the steering linkage was mving causeing the shaking. it was NOT.

  • Red neck
    Red neck Sep 07, 2014

    Add a Commentsecond I did the same witht he camera facing the left(driver's) side. same resaults. no shaking of the steering linkage. this is leaving me to believe that it may be in the antilock braking system.



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