New rotors wobble inside pad bracket

[thebraketester]

Aluminium anti seize... as above. That’s the best stuff to use anyway.

[brman]

Ok, given some of the comments here I think an explanation of how wheel/hub mount works is in order here....

The studs/nuts are there to clamp the wheel to the hub, the disc is sandwiched between the two. Obvious so far? However they do NOT stop the wheel from turning relative to the hub/disc. That is done by friction between the parts. Friction caused by that clamping effect. If the wheel can slide on the disc/hub (or the disc on the hub) then it will put a bending moment on the studs and they are likely to work loose over time. So, grease (or paint) in the wrong place is a very bad idea. Sure, most of the time you will get away with it but not all the time. I have had 2 cars (out of about 30, over 30 years) where the wheel has come loose because a "mechanic" thought it was a good idea to put copperslip between the wheel and hub.
So where can you use grease?
On the centre spigot is good as it often corrodes and is only for location, not clamping.
A thin (ie put it on and wipe it off) smear is also ok between a undriven hub and the inside of the disc.
Never between a driven hub and a disc or the disc to wheel faces.

I am sure lots of people will say it is common practice and doesn't cause a problem. If so, I think we have to agree to disagree but I would love for someone to show a manufacturers technical manual which suggests it is a good idea

[RobXjcoupe]

^ manufacturer’s don’t care if there car starts corroding on the unprotected steel parts. Maintaining a vehicle for many years requires certain parts to be given extra corrosion resistance. You simply can’t keep grinding and rubbing rust and corrosion from parts that need to be dismantled every couple of years. A light smear of suitable grease or even a coat of paint is not an issue. Use common sense or what it really should be called rare sense!

[brman]

RobXjcoupe said:

^ manufacturer’s don’t care if there car starts corroding on the unprotected steel parts. Maintaining a vehicle for many years requires certain parts to be given extra corrosion resistance. You simply can’t keep grinding and rubbing rust and corrosion from parts that need to be dismantled every couple of years. A light smear of suitable grease or even a coat of paint is not an issue. Use common sense or what it really should be called rare sense!

Well, each to his own. I think manufacturers do care, I think they just care more about the proper operation of their brakes. That is certainly more important than a minor maintenance issue years down the line
Ok, I am being a bit over cautious here, but do you really think suggesting grease is a good idea to someone who is so inexperienced they cannot get a disc flat on the hub? It is not about common sense, it is about knowledge which is sadly very lacking in most internet advice

I stand by my advice, slapping grease on a friction surface is not a great idea........

[Spurry]

brman said:

I stand by my advice, slapping grease on a friction surface is not a great idea........

At least it has not been suggested that he puts copperslip on both sides of the pads....