PCCB SAFTEY ISSUE
10-11-2006, 09:04 PM
#31
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Originally Posted by DanH
Isn't there now a Gen3 on the 997 which has gone back to a regular perforation pattern?
In the "Fact Book" they refer to them as:
Enhanced Porsche Ceramic Composite Brake
From the Turbo Product Info Guide.
The most important changes resulting from this optimized disc technology
relate to the shaping of the inner cooling ducts to achieve increased ventilation accompanied by enhanced brake cooling and rigidity and the composition of the employed materials, resulting in increased wear resistance.
The overall outcome is an increase in the performance of the brake system and a further extension of the brake system’s service life.
From he GT3/RS brochure:
To ensure maximum cooling during extreme brake usage,
the internal vents within each disc are subject to a process
of continuous development.
The number of cooling channels has recently been doubled,while
a new vent geometry offers a better flow of air through the
disc. With more cooling channels, there are more internal walls creating greater structural stability.
Externally,these modifications are clearly visible in the form of
a modified drill-hole pattern.
10-11-2006, 09:48 PM
#32
Originally Posted by MJones
FWIW
In the "Fact Book" they refer to them as:
Enhanced Porsche Ceramic Composite Brake:
In the "Fact Book" they refer to them as:
Enhanced Porsche Ceramic Composite Brake:
10-11-2006, 10:12 PM
#33
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Colm - I will answer your question this way. Yes, racers take spares. When spare ceramic rotors cost 8700 bucks each and, don't last longer on the track than old fashioned cast iron ones which cost 400 bucks each, guess which ones the race teams use? Porsche made a big mistake on the Gen 1 PCCB as fitted to 996 cars used on track by experienced drivers. On the 997 Cup cars which come with ceramic brakes as standard, a number of the pro teams have switched to metal rotors because the ceramics are not cost effective. If the ceramics cost only a bit more than the metal versions, there would be no issue. When one has to pay something like 35,000 dollars to replace 4 brake rotors, a much longer life is a reasonable expectation especially in view of the claims made by PAG that an H mentioned.
Cosmos - I posted the care and feeding of PCCB about 3 years ago. I managed to make mine last longer than most in spite of intensive track use. I replaced pads whenever they were approaching half thickness. It is also important to make sure the holes in the rotor are not plugged with pad material etc. Notwithstanding my care, at around 12000 miles the rotors failed, all 4 of them. The fronts failed as Paul described, delamination of the surface. The rears looked ok on the wheel side but the inner side had chunks missing!
Best,
Cosmos - I posted the care and feeding of PCCB about 3 years ago. I managed to make mine last longer than most in spite of intensive track use. I replaced pads whenever they were approaching half thickness. It is also important to make sure the holes in the rotor are not plugged with pad material etc. Notwithstanding my care, at around 12000 miles the rotors failed, all 4 of them. The fronts failed as Paul described, delamination of the surface. The rears looked ok on the wheel side but the inner side had chunks missing!
Best,
10-11-2006, 10:13 PM
#35
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Originally Posted by gweedo911
I assume this is the Enhanced PCCB. The cross-drill pattern is different from Gen 2 PCCB. Correct?
Here is a progression of drilling thru the generations
10-12-2006, 01:30 AM
#36
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Originally Posted by Bob Rouleau
I replaced pads whenever they were approaching half thickness. It is also important to make sure the holes in the rotor are not plugged with pad material etc. Notwithstanding my care, at around 12000 miles the rotors failed, all 4 of them. The fronts failed as Paul described, delamination of the surface. The rears looked ok on the wheel side but the inner side had chunks missing!
I'm at 10K miles with this pccb setup so I'll be keeping an eye on these rotors. I guess I'll be sourcing some steel GT3 Cup rotors as replacements. At the moment, my '04 GT3 will be used for 95% street driving. Some autox and DE events will happen but next year I'm too swamped with other stuff to get to driving events much.
What pads should I use for primarily street use with the new steel GT3 Cup rotors? I'd like to avoid noisy, squeaky brakes.
Thanks,
Allan
2004 GT3
1975 914-6 3.0 conversion
10-12-2006, 10:39 AM
#38
Three Wheelin'
Originally Posted by MJones
YES
Here is a progression of drilling thru the generations
Here is a progression of drilling thru the generations
10-12-2006, 11:38 AM
#39
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FWIW
Carrera GT have the Gen1 drill pattern...
Each disc contains a teltail
US Patent 6776265
Device for indicating the total load in the case of brake disks made of carbon-fiber-reinforced ceramic material
Patent Drawing of Gen2 disc
US Patent 7100748
Internally ventilated brake disk with curved cooling air ducts
Carrera GT have the Gen1 drill pattern...
Each disc contains a teltail
US Patent 6776265
Device for indicating the total load in the case of brake disks made of carbon-fiber-reinforced ceramic material
Patent Drawing of Gen2 disc
US Patent 7100748
Internally ventilated brake disk with curved cooling air ducts
10-12-2006, 03:22 PM
#43
Three Wheelin'
Originally Posted by cosmos
And they say you Brits don't have a sense of humor.....wait....humour, sorry.
We gave you monty python you gave us David Letterman. You owe us big time
