Hooting PCCB Brakes!!
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Hooting and squeaking appear to be common complaints with ceramic brakes, usually after a dry period and caused by light contact between pads and rotors, or sometimes a dragging handbrake.
Have them looked over by your OPC if you're worried, ask them to also check for play in the wheel bearings.
Regards,
Clive
Have them looked over by your OPC if you're worried, ask them to also check for play in the wheel bearings.
Regards,
Clive
Due to the composition of materials used in PCCB, Especially when cold and at low speeds the brakes do give feedback noise compared to the standard steel setup. This is normally increased if chemical substances have been used to clean the alloys. In which case i would recommend that any wheel acids are avoided for use with PCCB.
Obvoiusly because of the nature of the discs, they are designed to be used at very high temperatures as they are very resistant to fading. When steel discs would reach high temperatures and begin to fade, this is when the ceramics are beginning to really come to life.
Obvoiusly because of the nature of the discs, they are designed to be used at very high temperatures as they are very resistant to fading. When steel discs would reach high temperatures and begin to fade, this is when the ceramics are beginning to really come to life.
Many thanks Christoff "¦"¦..
I noticed when washing the car today I've got a couple of chips out the rotor on the outside corner, just on the very edge of the surface As you seem to be knowledgeable on ceramics I wondered if you thought this is considered to be a problem? I've heard rumours that these rotor are upwards of £1500 each [&:]
Cheers, Mike
I noticed when washing the car today I've got a couple of chips out the rotor on the outside corner, just on the very edge of the surface As you seem to be knowledgeable on ceramics I wondered if you thought this is considered to be a problem? I've heard rumours that these rotor are upwards of £1500 each [&:]
Cheers, Mike
Any chance you could post a picture of these for me to have a look?
Have a close look around the disc for any other fractures. You get some hairline 'stress marks' as a normality Porsches guideline to any other cracks is that if they are longer than 10mm then I would get them inspected by a dealer.
As far as these chips are concerned it would be difficult for me to comment without seeing them.
Definatly keep an eye on them if you are concerned
Have a close look around the disc for any other fractures. You get some hairline 'stress marks' as a normality Porsches guideline to any other cracks is that if they are longer than 10mm then I would get them inspected by a dealer.
As far as these chips are concerned it would be difficult for me to comment without seeing them.
Definatly keep an eye on them if you are concerned
Under the outer hard veneer PCCB disks are very soft, those chips could get bigger very quickly. New disks are £2,900 each (not fitted)
Unlike steels ceramics don't crack(those 10mm crack guidlines are for steels only) as they wear the thin the coating wears off and the glossy silver/grey finish has a patchy mottled finish. Porsche have their own charts which show this wear rate in 5 degrees of severity.
Your choice is to run the disks to ruin or replace them for steels (most popular choice - hardly anyone replaces like for like).
As for noises, mine sometimes 'gurgle' sometes squeal, mostly very quiet.
Unlike steels ceramics don't crack(those 10mm crack guidlines are for steels only) as they wear the thin the coating wears off and the glossy silver/grey finish has a patchy mottled finish. Porsche have their own charts which show this wear rate in 5 degrees of severity.
Your choice is to run the disks to ruin or replace them for steels (most popular choice - hardly anyone replaces like for like).
As for noises, mine sometimes 'gurgle' sometes squeal, mostly very quiet.
I am yet to see any steel discs that have cracked and im also yet to see a set of ceramics that are in need of replacement because of this. I have seen reference pictures of fractures in PCCB which would then be advised for replacement but its uncommon. The internal structure of PCCB is designed for maximum airflow due to the vent geometry. Extra cooling channels means increased surface area, and more internal walls which improve structural stability. This delicate design added with the way they are made as a composite, mean that stress fractures form with use. These are nothing to worry about unless they get worse
The very nature of PCCB is that they are much harder than steel and do not wear. They should in theory last the lifetime of the car but it is down to the user.
The very nature of PCCB is that they are much harder than steel and do not wear. They should in theory last the lifetime of the car but it is down to the user.
Link doens't work?
The cracks I was referring to were the radial cracks from the cooling holes on the face of the disks (not the vented grooves in the centre). Those are common on steels, they should not happen at all on PCCBs.I don't mean structural cracking.
PCCBS do wear, just have a look at your own disks. They will have a minimum thickness measurement stamped on them. If they wear below that, they should be replaced.
PCCBS main failure is delamination due to excess heat soak. I've seen 6 month old 997 GT2s at the ring with delaminated PCCBs. As you said, it depends on how the user treats them, they certainly won't last a lifetime if treated to lots of hard track days with minimum cooling periods. Once the outer coating has come off, they will destroy a set of pads in no time and are finished. The majority of steel disks end their life by either corroding (usually on the inside face), wear, or due to those radial cracks.
I'd suggest you keep a close eye on those chips to see if they get any bigger, because if they do, they will probably get bigger at an increasing rate.
The cracks I was referring to were the radial cracks from the cooling holes on the face of the disks (not the vented grooves in the centre). Those are common on steels, they should not happen at all on PCCBs.I don't mean structural cracking.
PCCBS do wear, just have a look at your own disks. They will have a minimum thickness measurement stamped on them. If they wear below that, they should be replaced.
PCCBS main failure is delamination due to excess heat soak. I've seen 6 month old 997 GT2s at the ring with delaminated PCCBs. As you said, it depends on how the user treats them, they certainly won't last a lifetime if treated to lots of hard track days with minimum cooling periods. Once the outer coating has come off, they will destroy a set of pads in no time and are finished. The majority of steel disks end their life by either corroding (usually on the inside face), wear, or due to those radial cracks.
I'd suggest you keep a close eye on those chips to see if they get any bigger, because if they do, they will probably get bigger at an increasing rate.
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