PCCB & Cast iron Brakes / pads technical information
PCCB & Cast iron Brakes / pads technical information
05-24-2012, 02:23 AM
#2
Rennlist Member
Real Life Example
There's currently a set of 996TT takeoffs on ebay which serves an excellent "teaching aid" on the topic of rotor wear. Search under "996 PCCB". Excerpt of pictures as follows. This is a set of so-called "Gen 1" rotors without the three dime-sized wear indicators and fewer ventilation vanes:
The RR is typical of a "well-used" rotor with extensive (yet even) delamination throughout the surface. Lighter, silvery areas are what remain of the original laminate. Deeper, brownish areas are what one should be concerned about and what accelerates pad wear. Marginally usable in some circles
...
FL shows this unusual "ring" of delamination around its outer edge. The contrast is clear in this picture--the delaminated areas exhibit a stony, concrete-like quality. Suspect a bad choice of brake pads in the past has contributed to this extreme and unusual wear pattern. This rotor belongs to the landfill...
FR. Notice the uneven pitting i.e. deeper around 10 o'clock...
A close-up of the same FR rotor...
Lastly, a textbook case of chipping in the RL. Unusual stress fractures close to the hat. Porsche CCBs tend not to stress-crack (unlike those found in Lamborghinis and AMGs and even when they do, the cracks typically emanate from the drill holes. Another one for the landfills...
FWIW the seller's listing these rotors individually at $1.2-1.3k per corner. Dunno what's in the water over there but most people wouldn't want these rotors even for milk-run duty...
The RR is typical of a "well-used" rotor with extensive (yet even) delamination throughout the surface. Lighter, silvery areas are what remain of the original laminate. Deeper, brownish areas are what one should be concerned about and what accelerates pad wear. Marginally usable in some circles
...FL shows this unusual "ring" of delamination around its outer edge. The contrast is clear in this picture--the delaminated areas exhibit a stony, concrete-like quality. Suspect a bad choice of brake pads in the past has contributed to this extreme and unusual wear pattern. This rotor belongs to the landfill...
FR. Notice the uneven pitting i.e. deeper around 10 o'clock...
A close-up of the same FR rotor...
Lastly, a textbook case of chipping in the RL. Unusual stress fractures close to the hat. Porsche CCBs tend not to stress-crack (unlike those found in Lamborghinis and AMGs and even when they do, the cracks typically emanate from the drill holes. Another one for the landfills...
FWIW the seller's listing these rotors individually at $1.2-1.3k per corner. Dunno what's in the water over there but most people wouldn't want these rotors even for milk-run duty...
Last edited by CRex; 07-03-2012 at 09:50 PM.
05-28-2012, 03:58 PM
#3
Rennlist Member
I was in Monaco this weekend and I spoke to a few CUP car teams there.
Supercup is mandatory PCCB.
-The mechanics said that they lose a day bedding them in, they only last 3 weekends and they prefer steel because cheaper and work just as well and last longer. Just their 0.02c.
Supercup is mandatory PCCB.
-The mechanics said that they lose a day bedding them in, they only last 3 weekends and they prefer steel because cheaper and work just as well and last longer. Just their 0.02c.
05-28-2012, 08:48 PM
#4
Rennlist Member
Costs notwithstanding, PCCBs offer a steering feel that no cast iron rotor can match. Physics is physics--that 10-11 pounds of unsprung weight per corner shows in the steering*. Enough for me to put the PCCBs back on after having the street GT3 irons for two weeks.
Just three weekends for supercups sounds pretty bad. I remember hearing longer--to the tunes one set per season, but that's just hearsay. PMNA does sell the rotor (sans hat) at deeply discounted pricing--some $1-2k per rotor IIRC; can anyone with a Motorsport account please chime in? IMO this is a matter of pricing--at say $5k for 4 corners there's a good argument to be made...
* with steer-by-wire in the 991 this may become a moot point...
Just three weekends for supercups sounds pretty bad. I remember hearing longer--to the tunes one set per season, but that's just hearsay. PMNA does sell the rotor (sans hat) at deeply discounted pricing--some $1-2k per rotor IIRC; can anyone with a Motorsport account please chime in? IMO this is a matter of pricing--at say $5k for 4 corners there's a good argument to be made...
* with steer-by-wire in the 991 this may become a moot point...
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01-31-2013, 02:11 AM
#8
Rennlist Member
Ideally we'd get the bite of RS15s and the durability of RS29s...
01-31-2013, 04:02 PM
#10
Former Vendor
