I'm installing rear discs from a late model Camaro (with the emergency brake shoes) on my drum brake 64 El Camino. The backing plate bolts up fine but there is a step at the base of the hub that prevents the rotor from sitting flush, even though the backside of the rotor is chamfered. It also forces the rotor against the caliper bracket.

Is it necessary to have it turned on a lathe, ...or can I just grind it off? It looks as if the rotor is centered on the hub above the location of the step.

Is there a torque spec for the backing plate bolts?

thanks

Well, if you know what you are doing then you might be able to grind it off. But, if you want it to look good, then I would have it turned.

With the backing plate bolts, then just use lock tight and tighten them down.

Before I could install the rotors on my Baer rear disc "touring" brakes, I had to have them turned down so the rotors fit. I would definitely not grind them. The rotor needs to fit precisely on the axle hub. I don't know the torque spec on the backing plate bolts off hand, I'm sure someone will chime in with that info.

Mikr

Are you saying the rotor hat is not fitting on the axle flange flush? If so, the flange needs to be turned down. I did this on my '69 Firebird using the '80 Trans Am disc setup by grinding down the axle flange until the rotor fit. I just fired up the car (on jackstands), put it in gear at idle, and used a 4 1/2" grinder on the outside of the flange, until it fit properly. This won't work unless you have a posi, though. If the interference is on the inner hole of the disc, i.e. the raised center hub on the axle flange is too big, I'd have to say take the rotors to the machine shop, have them machined to fit. FWIW, the wheel studs will locate the rotor just fine, as long as the holes match the stud size.

At lunch the other day I dropped the axles off at a machine shop to get the step turned down to match the rest of the hub. Before I could get back to work, they called to tell me the bearing surface was bad and they wanted to make sure I still wanted them turned, saving me $45.00.

So I need new axles, 28 spline for a 10 bolt.
Are there some out there that don't have the step?

This will be a street machine for cruising.