zenny6377

Hi all - I have a 1990 S2, the rotors needed replacing (just talking about the front in this thread), I bought solid ones and they have to be machined to spec or the calipers don't fit... long story short, the machine shop screwed up and took more material off one side. My question is, can I avoid the machining hassle/cost of new rotors by purchasing drilled rotors? Or do new drilled rotors also need to be machined in order to fit? (I thought you couldn't machine drilled rotors but you can find many opinions re. that online)

Thanks

Jfrahm

They shouldn't have needed to be machined, however it can be hard to get the pads to fully retract on the S2/Turbo/968 brakes. I've replaced rotors many many times on P-cars and others and never ever ever have had to machine new rotors.
I'm not a fan of drilled rotors. I would just get quality stock replacements and run 'em. Maybe you need to clean up the backing plates on your pads or something.

Tom Pultz

As Joel said, new (correct) rotors do not need to be machined. Genuine Porsche rotors are not cheap, about $123 USD for the S2, but would be my choice.

zenny6377

That's interesting - I guess I got duped since they claimed they were for the S2 but were slightly too thick. Won't make that mistake again - thanks for the responses.

Jfrahm

They probably aren't too thick. I have struggled getting them to fit myself. It's not easy to get everything clean and the pads retraced enough. You can always look up the spec for new rotor thickness and measure.
Zimmerman's are nice, Raybestos have been OK for me. I prefer coated rotors for less rust.

djantlive

You can also open the bleed valve to let out the pressure and fluid to get the pistons to retract. Brake fluid is corrosive so get a clear hose when you bleed or flush the fluid into a bottle