markc123

How many of you turn NEW brake rotors before installation?

Greg Fishman

No reason to do that, in my experience.

Ray Calvo

Never have in 30+ years of car ownership.

Mark in Baltimore

Yeah, no need to turn new rotors and take away disc material. Besides, if you're talking about 993 stoppers, I don't think you can turn rotors that have vent holes.

mike cap

Kim,

That comment is going to start a lot of discussion about your love life....

jford

So thats what the holes are for! Sorry, couldn't resist.

Jamie

BTW...Steve at Ultimate Garage has equipment for turning cross drilled rotors. I believe, however, that it is more cost effective to purchase new ones.

Dudley

It seems wasteful to not be able to turn drilled rotors. Whenever I have serviced disc brakes with solid rotors, I have always had the rotors refaced.

My rotors are fine but when people replace their pads - do they also replace their rotors?

TIA,

Dave

TrackJunke

I have not heard of anybody tuning new rotors. But I believe it is recommened to scrub them with soap and water to get any oils off of the braking surface.

jford

I'll check with Steve about pricing for turning cross drilled rotors. I do not replace rotors every time I do pads...with the Padgid orange you only get about 6 or so track days out of the front pads (depending on the track, etc.) When I replaced my front rotors I used a cleaning agent on the surface to remove and oils on the surface.

Jamie

chris walrod

Years ago it was recommended to turn all new rotors and drums. This was from our Raybestos rep, late 80's. These days manufacturing quality has risen to the point where one can just clean them well and install.

We would turn new rotors and drums and actually find runout on them. Never understood why exactly?

Mark in Baltimore

Dave,

Rotors are usually replaced when they get too thin or, depending on which criteria you ascribe to, 1) the vent hole cracks exceed 7mm in length; 2) cracks start to meet three vent holes; 3) the lip on the edge of the disc becomes too high; 4) a combination of the previous three.

Thread on rotor cracks

horizontally opposed

I never turn Porsche rotors. For the short time they last after turning (warping is usually my issue and turning is BARELY a temporary fix for that) and the costs to do so (while minimal), I throw a fresh set of Zimmermans on ($200 a pair for the 993).

as always - YMMV

Jeff96-993

I priced a set of Zimmerman's recently, and then found a set of Porsche OEM from Sunset for as good a price...

Needless to say I went OEM.