Volvo RWD 200 Forum

I guess I got to think backwards all right. I don't wear hats well and now I know why.

I dug up my spare used ventilated disc rotor.

You are describing the disc rotor as a hat. On the inside of the hat. The distance from the back side of the rotor to the back side of the bolt hole flange of the rotor which locates on the spindle face that the studs are located in. I get 2.400 inches. Plus .260 for flange thickness. Overall 2.665 inches.

From the outside top of the hat. The bolt hole flange top surface to the disc is about 1 3/4 inches. If you add the allowed turned thickness of .800 plus to the disc should be the overall height of around 2.665 inches.

I once had a rotor turned and the fool did not locate the inside back flange flat on the brake machines face. I figure he used a cone adapter. I got the rotor back running out more than I had before. I took it back and they lied. That it ran fine. Boy was I hot!

Then, I wanted them to check the depth from that inside flange surface to the turned surface with a parallel bar and depth mike right there on the counter cause they would not let me see it on the machine.

They sighted insurance reasons! I said to myself. Self, your not ever going to let some one else do another!

I took it home to my marginal sized lathe. I had to face the inside or that bolt flange true to their parallel faces. It didn't take that much because that face actually wobbles less when compared to the larger outer diameter faces. I saved the rotor that they were refusing to admit they should buy. They knew if they cut the disc faces again it would be under minimum allowed.

Brake lathes to a better job because they are dedicated for that purpose of parallel cutting. Because, I was able to rework that inside surface I didn't waste my money. If I ever have another one done I'm taking micrometers and parallels and checking it on the spot!

My suggestion would compare the above dimensions and determine what is locating what. Spindle nose stud surface or rotor inside surface. All in relation to the caliper bolting surface to find where you can get movement.

I feel you got an inferior rotor or the rear bearing of the spindle that didn't get seated all the way in. It takes some straight on push to set them all the way. I always check the back side with a mirror.

It's got be something?

Anyways, I shared my story so it might help with your frustrations.

Phil