|
|
08-21-2023, 05:32 PM | #1 |
New Member
12
Rep 17
Posts |
Rotor replacement due on PFC Z54 BBK?
Anyone have a recommendation for determining when to replace rotors? I have a PFC Z54 front big brake kit on a 2011 BMW M3 and the rotors are showing spider web cracks. I have a new spare set I could put on, but don't want to needlessly do it.
From my reading online, minor webbing is ok as long as there are not cracks connecting between cross-drilled holes. But these rotors don't have holes, so I'm not sure how to evaluate. I don't have a full history on the rotors because I purchased it last year. I also have been unable to find out the minimum rotor width or acceptable wear amount (which I could compare to the new set) online. If it matters, I'm an intermediate driver, will be at a couple tracks that are harder on brakes (e.g. Mid-ohio & pitt race), and am transitioning from summer tires to a stickier lower tread wear tire (but not a slick). Pic: https://photos.app.goo.gl/7PSLQy6fJMXjp5mb9 |
08-27-2023, 10:51 PM | #2 |
Private First Class
75
Rep 161
Posts |
Cracks are ok so long as they don't go to the edge of the rotor. Make sure you check the inside side of the rotor as well. Rotor explosions on track are rare but are incredibly scary and can cause serious damage to you and the car.
Also these rotor rings are harder to get nowadays. I think Bimmerworld stocks a few but I believe PFC rarely makes them, if at all. |
Appreciate
0
|
08-30-2023, 03:15 PM | #3 |
Derbo Tuning
3610
Rep 3,025
Posts |
If you can catch your fingernail on the cracks, its time to replace.
This is a good article on inspection/maintenance https://paragonbrakes.com/rotor-insp...d-maintenance/
__________________
IG:ruhrohz_m3
Journal: Link E9x ZCP Suspension Info: Link Track Chat Discord: https://discord.gg/VsKbTyqBVj SF Bay Area: DM For coding services |
Appreciate
2
DrFerry6730.00 Davisca4552207.50 |
09-25-2023, 10:59 AM | #4 |
Captain
2208
Rep 865
Posts |
This pic shows the “cracking” after Motorsport use that Derbo’s document describes.
I replaced these (kept them as spares) because I was headed to Sears Point.
__________________
Chris, 2008 E92 |
Appreciate
0
|
Post Reply |
Bookmarks |
|
|