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2012 Superduty Brake Issues

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Old Jan 3, 2021 | 10:32 AM
  #1  
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2012 Superduty Brake Issues

Had rotors turned, installed new pads.

Now I get rhythmic clunking when braking, worse with more pressure.

I also did a test stop, to simulate emergency braking, and they SUCK. It used to stop MUCH better.

Anyone seen this before?
 
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Old Jan 3, 2021 | 11:22 AM
  #2  
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Quite possibly the rotors aren't true. I'd measure the runout while turning it by hand to rule that out. I would also confirm the rotor thickness is within spec (I never trust anyone's word on a major safety item like this).

-- Dave
 
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Old Jan 3, 2021 | 02:44 PM
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I agree its the rotors. Who ever cut them could have tried to take too much off in one cut or not mounted the rotor incorrectly on the lathe and not cut them square, I would plain on new rotors and be done with it.
 
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Old Jan 3, 2021 | 03:02 PM
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I vote rotors as well.
I used Raybestos SP Performance and Bosch pads on my 2016.
Slots vent hot air, and Bosch pads are tough while dusting less.
Flushed and bled with Bosch fluid at the same time.
Stop on a dime.
You don't say if 2x or 4x4, but on my 2016 4x4, the caliper bolts are one time use, TTY. (Torque to Yield) New hardware is cheap.


 
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Old Jan 3, 2021 | 11:09 PM
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UPDATE

Driver Front rotor was .025 out on face, .024 out on backside... high spots being 180 out from each other.

Passenger front rotor .007 out on face...

All else was perfect.

New front rotors and wagner pads. Stops wonderful!!!

Thanks!!!
 
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Old Jan 4, 2021 | 09:21 AM
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Wow, who exactly turned these?? 25 thou is a mile for machining here. Could do better with a stone by hand.
 
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Old Jan 4, 2021 | 02:05 PM
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Originally Posted by WWR
Wow, who exactly turned these?? 25 thou is a mile for machining here. Could do better with a stone by hand.
Seriously. That is incredibly shoddy work. You should be discussing your findings with the shop that turned those. I'd be asking for a refund.
 
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