These grooves don't look right... Machined rotors & new pads
06-09-2018, 03:01 PM
#11
Blunt
Thread Starter
Thanks! I'll have to mention it when I bring it back on Monday... Now I'm worried about driving this weekend, the video mentioned damage to rims from the overheating which makes sense... Doesn't seem to be a quick way of telling if they're on backwards without removing the wheel and caliper...
06-09-2018, 03:04 PM
#12
Blunt
Thread Starter
I had a vibration on a previous vehicle. Had the tires road force balanced. Vibration still there.
I got the truck home and jacked each wheel, took it off and expected and cleaned the matting services. I put the wheels back on, hand tightening the lug nuts as tight as I could while shaking the wheel to ensure a solid contact.
I then tightened the lug nuts to half torque using the star pattern. After the final torque, I took it for a test drive on the smoothest road in the area. Vibration gone.
I went back to the tire shop and told the manager what I'd done.
His response was "we don't have time for that".
I got the truck home and jacked each wheel, took it off and expected and cleaned the matting services. I put the wheels back on, hand tightening the lug nuts as tight as I could while shaking the wheel to ensure a solid contact.
I then tightened the lug nuts to half torque using the star pattern. After the final torque, I took it for a test drive on the smoothest road in the area. Vibration gone.
I went back to the tire shop and told the manager what I'd done.
His response was "we don't have time for that".
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BlackBoost (06-09-2018)
06-09-2018, 03:31 PM
#14
Do some research (not here) and you will learn that machining like that is in fact crap. In essence they made fine threads that the pad will have to repeatedly be skipping until the grooves are worn away. Very poor practice that quality shops stopped doing around 30 years ago. A rotor should be machined by grinding. You will know it by seeing a cross hatch pattern.
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chimmike (06-09-2018)
06-09-2018, 04:29 PM
#15
Senior Member
Thanks! I'll have to mention it when I bring it back on Monday... Now I'm worried about driving this weekend, the video mentioned damage to rims from the overheating which makes sense... Doesn't seem to be a quick way of telling if they're on backwards without removing the wheel and caliper...
06-09-2018, 05:21 PM
#16
Master Fly Fisherman
Most rotors on vehicles now days are so thin that they can't be machined. They're making them lighter for less rotating weight for improved fuel economy. Besides that, most rotors that the parts stores have are all china junk. Find some decent ones made in USA or Canada. They'll be a better material. Turning rotors is a thing of the past.
06-09-2018, 05:33 PM
#17
Senior Member
Yes and yes. You got a flunkee technician. They owe you a set of pads and rotors, and maybe a couple free oil changes to cover your lost time. I've seen 150 pads reversed more than once, and your results are textbook. Don't take any crap from the service writer or manager either. Tell them to fix it and comp. you something, or it goes to regional management. That's inexcusable for a professional shop, dealership or otherwise.
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BlackBoost (06-09-2018)
06-09-2018, 05:34 PM
#18
Most rotors on vehicles now days are so thin that they can't be machined. They're making them lighter for less rotating weight for improved fuel economy. Besides that, most rotors that the parts stores have are all china junk. Find some decent ones made in USA or Canada. They'll be a better material. Turning rotors is a thing of the past.
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BlackBoost (06-09-2018)
06-09-2018, 06:11 PM
#20
OEM's give a minimum spec on rotors. If you can cut it and still be above min than there's no reason not to. I see people say that it's a thing of the past, yet I have never found an OEM rotor that wasn't able to be cut once.