Hi. Having done my best search and coming up short can someone help me.

I am looking for the max (starting) and then minimum thickness of both brake pads and rotors for PCCB on a 2011 Cayenne.

Current measurements:

Pads:
L/F – 9/32”
R/F – 8/32”
L/R – 6/32”
R/R – 7/32”

Rotors:
L/F – 1.504”
R/F – 1.500”
L/R – 1.184”
R/R – 1.182”

Thanks!

 

Just a heads up - the rotors almost never wear out. Pads, yeah, but rotors? Nope.. (and that's a good thing since they're around $4,500/each) and most spec's I've seen call for a minimum pad thickness of 2mm.

 

Looked a bit - some info from the manual:

Brake disc thickness, front 38 mm (new)
Brake disc thickness, rear 30 mm (new)

Brake disc wear limit, front
Minimum brake disc thickness (wear limit) is stamped on the brake disc hub.
Example: Min. Th. 37.7 mm mm (Read value on brake disc hub) XX.X

Brake disc wear limit, rear
Minimum brake disc thickness (wear limit) is stamped on the brake disk hub mm (Read
value on brake disc hub) XX.X

The numbers you show make it apparent there is no wear on those rotors (is there a lip at the edge? No? Then there is no wear.. I've never seen a lip on PCCB rotors.)

 

Thanks for the info.

Looks like the pads are pretty worn then:

- Rear: 6/32" = 0.1875" = 4.75mm vs the starting 30mm; and close to a 2mm minimum
- Front: 8/32 = 0.25" = 6.3mm vs the starting 38mm

38mm seems an awefully large brake pad to start with at 1.5 inches.

 

Sigh..

I gave the specifications for the brake ROTORS.

I thought that would be obvious with the references to "brake disc" throughout the measurements. "brake disc" = rotor.

 

Pad specs:

Pad thickness, front
Wear limit 2 mm, approx. 8.6 mm (0.33858268")

Pad thickness, rear
Wear limit 2 mm approx. 8.9 mm (0.3503937")

And I have no idea how many 32nd's that is. Since this is a German car forum, it's perhaps helpful when asking questions if you use the measurement standards the manufacturers do - and in all the rest of the world that's metric not the arcane English standards. Many people will simply ignore a poorly asked question.

Are you buying these used?

 

Ha - was obviously reading to quickly on my phone. That's why it didn't make sense.

Actually from Australia, so inches, let alone fractions of an inch don't make all that sense to me. Figured this being a predominantly American forum it wouldn't be a problem and that's how it was quoted to me. Not sure it was a poorly asked question - just looking for the starting point and min - I can do the conversion.

Yup - used car. Worried it has PCCBs as I haven't dealt with them before.

Thanks for the info - appreciate the assistance!

 

Can anyone help with the overall height of the Cayman PCCB rear rotor? I've been searching everywhere but can't seem to find this elusive dimension!

Rotor 350 x 28 x xx

The standard Cayman rotors have an overall height of 67mm is the PCCB rotor the same or different.

Thanks

 

Moving this over to the 958 subforum. Moochier - you might do better posting this in a Cayman forum..

 

PCCB are almost always, if not always, larger than the steel counterparts. For example on my 2005 997.1 C2S, stock steel big-red rotors are 330mm on the front and something smaller on the rear. The PCCBs I have on this car are 350mm at all 4 corners and the fronts move from the red 4-piston calipers to a yellow 6-piston calipers (rears are 4 on both).

On my 2009 Cayenne Turbo S, front big red rotors are 380mm x 38mm whereas the PCCBs from a 958 that I'm retrofitting are 410mm for the front.

Dalema, what's importatnt with PCCBs on a used vehicle is that there aren't any chips in the edges of the rotor and that the surface of all of them is extremely smooth and shiny without any dark areas where the carbon ceramic is worn or coming apart.

A bad PCCB rotor looks like this - see how uneven and choppy the surface is with random dark areas. Also around the edge, the ceramic structure is very rough and compromised (photo from a set I was looking to buy, but obviously didn't)



and here is what a perfect used PCCB rotor looks like (these are the ones going on my widebody Cayenne Turbo S)




Here are a couple of the ones on my RUF 997 with about 53,000 miles on them




PCCBs are awesome - virtually zero brake dust, rotors lasting the life of the car, pads beyond 50,000 miles, no fade, less unsprung weight, don't rust when you wash the car, etc. Just be very careful when doing wheel removal and use two guide pins per wheel.