2014 FX4 Vibration Under Braking - Not Rotors?
09-01-2017, 03:52 PM
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2014 FX4 Vibration Under Braking - Not Rotors?
My truck is a 2014 FX4 super crew with the ecoboost. I currently have 56,000 miles on it. I had new tires put on around 51,000 and new rear brakes around the same time. The front brakes were done around roughly 35,000-40,000.
A couple months ago, probably 2,500 miles a vibration developed that is pretty severe. It only happens under braking, is somewhat inconsistent, but definitely gets worse as speed increases. There is no shaking in the steering wheel and little if any pulsation in the brake pedal.
I put an indicator on the rotors and saw .0025"-.003" of runout in the rear rotors and .0015"-.002" of runout in the front rotors. It feels like it's coming from the rear so I pulled the rear brakes off, made sure the pads were free, no e-brake dragging, and rotors were sitting flat. There was no indication whatsoever that there was a problem. Put everything back together and the vibration seemed to get better. The next morning it was back and just as bad as ever.
Based on the symptoms I was convinced it had to be rear rotors being warped so I put a new set of pads and rotors on today, but after a test drive, it is still there.
Is there any known issues like this or something I should check? Could it be in the rear end? The truck drives fine other than braking so I don't think it is a tire issue and no vibration in the steering wheel and lower runout readings point me away from front brakes. I am looking for ideas before I start throwing money at guesses. Any help would be appreciated.
Craig
A couple months ago, probably 2,500 miles a vibration developed that is pretty severe. It only happens under braking, is somewhat inconsistent, but definitely gets worse as speed increases. There is no shaking in the steering wheel and little if any pulsation in the brake pedal.
I put an indicator on the rotors and saw .0025"-.003" of runout in the rear rotors and .0015"-.002" of runout in the front rotors. It feels like it's coming from the rear so I pulled the rear brakes off, made sure the pads were free, no e-brake dragging, and rotors were sitting flat. There was no indication whatsoever that there was a problem. Put everything back together and the vibration seemed to get better. The next morning it was back and just as bad as ever.
Based on the symptoms I was convinced it had to be rear rotors being warped so I put a new set of pads and rotors on today, but after a test drive, it is still there.
Is there any known issues like this or something I should check? Could it be in the rear end? The truck drives fine other than braking so I don't think it is a tire issue and no vibration in the steering wheel and lower runout readings point me away from front brakes. I am looking for ideas before I start throwing money at guesses. Any help would be appreciated.
Craig
04-04-2021, 06:35 PM
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Same problem
Hey Craig,
I have the same exact problem. Any chance you figured this out a few years ago when you posted this? I've had my rotors replace multiple times but issue keeps coming back. Tired of spending money on this... Really appreciate any advice
Thanks,
Mike
I have the same exact problem. Any chance you figured this out a few years ago when you posted this? I've had my rotors replace multiple times but issue keeps coming back. Tired of spending money on this... Really appreciate any advice
Thanks,
Mike
My truck is a 2014 FX4 super crew with the ecoboost. I currently have 56,000 miles on it. I had new tires put on around 51,000 and new rear brakes around the same time. The front brakes were done around roughly 35,000-40,000.
A couple months ago, probably 2,500 miles a vibration developed that is pretty severe. It only happens under braking, is somewhat inconsistent, but definitely gets worse as speed increases. There is no shaking in the steering wheel and little if any pulsation in the brake pedal.
I put an indicator on the rotors and saw .0025"-.003" of runout in the rear rotors and .0015"-.002" of runout in the front rotors. It feels like it's coming from the rear so I pulled the rear brakes off, made sure the pads were free, no e-brake dragging, and rotors were sitting flat. There was no indication whatsoever that there was a problem. Put everything back together and the vibration seemed to get better. The next morning it was back and just as bad as ever.
Based on the symptoms I was convinced it had to be rear rotors being warped so I put a new set of pads and rotors on today, but after a test drive, it is still there.
Is there any known issues like this or something I should check? Could it be in the rear end? The truck drives fine other than braking so I don't think it is a tire issue and no vibration in the steering wheel and lower runout readings point me away from front brakes. I am looking for ideas before I start throwing money at guesses. Any help would be appreciated.
Craig
A couple months ago, probably 2,500 miles a vibration developed that is pretty severe. It only happens under braking, is somewhat inconsistent, but definitely gets worse as speed increases. There is no shaking in the steering wheel and little if any pulsation in the brake pedal.
I put an indicator on the rotors and saw .0025"-.003" of runout in the rear rotors and .0015"-.002" of runout in the front rotors. It feels like it's coming from the rear so I pulled the rear brakes off, made sure the pads were free, no e-brake dragging, and rotors were sitting flat. There was no indication whatsoever that there was a problem. Put everything back together and the vibration seemed to get better. The next morning it was back and just as bad as ever.
Based on the symptoms I was convinced it had to be rear rotors being warped so I put a new set of pads and rotors on today, but after a test drive, it is still there.
Is there any known issues like this or something I should check? Could it be in the rear end? The truck drives fine other than braking so I don't think it is a tire issue and no vibration in the steering wheel and lower runout readings point me away from front brakes. I am looking for ideas before I start throwing money at guesses. Any help would be appreciated.
Craig
