o2bcdn

This pic is from my 991S front-right brake rotor. The car has 6000 miles, including 500 track miles and the original brake pads, which are almost worn out. I am planning to replace the pads with Porsche OEMs before my next track day.

I understand from a PCA instructor at my last track day that small fissures radiating from the cross-drilled holes in the rotor are normal wear-and-tear. What I don't know is how much longer these rotors will last. There is reasonable amount of thickness left on the rotors. Both front rotors show similar levels of fissures, the rear rotors show none.

Any ideas on how to judge the remaining life when considering these fissures? I hope to get 3 more track days out of them, but am not sure if that is realistic.

Appreciate any feedback...thanks.

extanker

where i live we them cracks. imo i would get a new pair matched with pads.soon. maybe improve on rotor/brake cooling ducts

John's 991

Mine look about the same. I am half way through my 3rd set of stock pads in 5,200 miles (more than 500 miles on the track) and I am going to replace the rotors and pads after next track weekend. I'm going to try the Pagid pads as well.

The rule of thumb I have heard is when the cracks get to the edge or connect the holes.

shizzle

My rotors look pretty similar, and I've also been told not to worry until you see cracks that connect holes, or reach the edge of the rotor.

I've run the Pagid RS29 on my car for about 2 track days (i've got about 20 total on these rotors), and i've found that they increase braking ability significantly, but haven't really seen any accelerated rotor wear.

John's 991

Hi swizzle, do you change pads or keep the Pagids on all the time? Do you find them loud on the street?

shizzle

I've left them in since i've got about 6 track days over the next two weeks. Even though i've bedded them (and tried titanium shims I had made), they squeal like crazy - seriously loud. I'll probably swap them out after next weekend.

On a similar note, i've left the brake sensors connected on the pagids, and have had no problems with them.

I actually don't mind the design of the new calipers. Although you've got to take the calipers off, you don't need to fiddle with the bridge clip, so its just a matter of sliding the old pads off, and sliding the new ones on.

kosmo

They look ok but i would replace them after your track sessions. If youre intending to do more tracking then consider slotted aftermkts. The oem are known to crack

John's 991

Thanks shizzle. I got some anti-squeal compound i was going to try but am not overly optimistic. If they are bad I will just swap them.

rnl

Wouldn't slots be better than the drilled holes on the rotors?

hf1

I think you should be OK for at least 3 more track days. After each event check to see if any cracks have connected any holes or reached the edge. Have the replacement rotors (slotted, not drilled, this time) ordered and handy for when that happens. Oh, also brake less and lose less momentum -- you go faster that way.

Camber

This looks completely normal to me. As hf1 stated, you want to make sure the holes are not connected and the cracks don't go to the edges of the rotor. I would guess you have lots of usage left.

kosmo

Im probably gonna get these Brembo 2 pieces next

shizzle

^ I ordered these a while back, and they just arrived. One thing to note about the Brembo rotor kit is that even though it is a rotor upgrade and uses the stock calipers, the front pad shape is different with these rotors. The front kit contains new pads which have a slightly different shape to accommodate the larger surface area. The OEM pads can be used in the rear, but not in the front. I got mine from Gruppe Werks (www. gruppewerks.com) and they were good to deal with.