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ive been noticing some odd marking on my rotors and figured a longer trip would clear it up. I just got back from a 350 miles round trip and no difference. The rotors feel smooth to the touch and the truck stops smooth and straight as you would expect.
I rotated the tires 5000 miles ago and the brake pads looked like half left or better on all wheels/pads.
truck is a ‘17 F250 supercab 4x4 with 6.2. Have you ever seen rotors with this kind of marking on it? On anything else I have owned they always clear up after a quick trip.
edit: truck has original brakes and has 43k miles. I’d say 65-70% highway with about 1000 of that being towing
thx
Last edited by America78; Jun 13, 2021 at 06:13 PM.
Reason: Added comment
Those are heat spots from a phenomenon called cementite of the iron. The rotors got too hot before the pads were bedded in. Take something like a screwdriver and see if you can feel a transition from the unaffected surface to the affected surface. It will probably stand a touch proud of the unaffected surface. If you want a detailed explanation and how to prevent it from happening again, search the Internet for brake rotor cementite spots. You will eventually be replacing the rotors.
Thanks All! I guess I will replace the rotors when I do the pads in the future. As of now everything is working well so will leave it til the pads are needed. I’m guessing a 55-0 panic stop with 2500 lbs of bagged rock in the bed a couple years ago may be the cause
You could try and bed them again. Run up tp 60 or so slam on the brakes and get down to about 10 or so don't stop. Take off and get back to 60 and do it again. After a few of these power stops drive around about 20 minutes to cool them down. I know this has worked for me own the past with heat spotted rotors.
You could try and bed them again. Run up tp 60 or so slam on the brakes and get down to about 10 or so don't stop. Take off and get back to 60 and do it again. After a few of these power stops drive around about 20 minutes to cool them down. I know this has worked for me own the past with heat spotted rotors.
This. Bedding new brakes can really improve their bite and the initial transfer of material between the pads and rotors. It's highly recommended with premium pads and even tired pads can be rejuvenated somewhat by a quick bedding. I normally do a slow warm up starting with 30 mph down to 15 four or five times and then do the 60mph down to 15 four or five times followed by a good 15-20 minutes of easy highway cruising to cool it all down. The key is finding the right location to do the whole process that will culminate with you entering the highway right after the last brake application.
Check out this EBC procedure shown under #9 on the list. It's worked great for our last 3 Jeeps as well as our Z4 while using their Greenstuff pads. https://ebcbrakes.com/about-ebc/faqs/
