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so the moral of this is "check your hats..."? I'm a little surprised that Porsche's QC allows a new part with a -20% to be used ... also interesting to see the range of values each rotor has - who knew that the manufacturing process involved such variance/tolerance!
these rotors are NOT porsche rotors, but are brembo rotors with porsche part numbers - and when I received them I visually inspected and compared them to the Porsche rotors. According to Brembo they are the identical part number to Prosche and the identical rotor composition and manufacturing process to Porsche Rotors (Brembo makes the rotors for Porsche)
we have no data has to if the right rear rotor would be rejected by Porsche due to it's lower overall capacity range (max - min)
once I"m done here - I'm going to go check my other Prosche's and their PCCB's and publish the Density unit range to get an idea - I have a Taycan, Cayenne, 992 911 Turbo S - I'll publish the hat wear values to this thread for comparision purposes
I also have the factory "take offs" from my 2018 GT3 - but they are at the shop right now as parts for the brake job - so I can not publish their max/min rotor hat values at this time - but I'll update/publish when I get the vehicle and parts back from my mechanics.
the factory PCCB rotors on my GT3 have only break in miles on them and no track days- since prior to obtain the Brembo "affordable" rotors I had swapped to steel like everyone does.
these rotors are NOT porsche rotors, but are brembo rotors with porsche part numbers - and when I received them I visually inspected and compared them to the Porsche rotors. According to Brembo they are the identical part number to Prosche and the identical rotor composition and manufacturing process to Porsche Rotors (Brembo makes the rotors for Porsche)
we have no data has to if the right rear rotor would be rejected by Porsche due to it's lower overall capacity range (max - min)
once I"m done here - I'm going to go check my other Prosche's and their PCCB's and publish the Density unit range to get an idea - I have a Taycan, Cayenne, 992 911 Turbo S - I'll publish the hat wear values to this thread for comparision purposes
I also have the factory "take offs" from my 2018 GT3 - but they are at the shop right now as parts for the brake job - so I can not publish their max/min rotor hat values at this time - but I'll update/publish when I get the vehicle and parts back from my mechanics.
the factory PCCB rotors on my GT3 have only break in miles on them and no track days- since prior to obtain the Brembo "affordable" rotors I had swapped to steel like everyone does.
I can reconstructure the milages since I have odometer readings from each of the pad swaps - there are 11,500'ish miles on the car - most of that is track miles - rotors have been on the vehicle since Jan/Feb. of 2019 - but less track days in 2020 due to pandemic.
miles are kinda of not the issue, pad wear is the main issue and because of tracking my pad wear is very accelerated.
again I've consumed 3 full sets of PCCB pads - the 4th set on on the vehicle now and are slightly used - the rotors were measured because I had the vehicle at a porsche dealer for unrelated issue and I asked them to do the measurement since they have the tool.
I'm only on my second set of pads, driving both street and track, keeping tally of track miles for hub changes as recommended by the factory. Now, will keep track of pad usage as well as mileage for rotor changes. Thanks again!
I'm only on my second set of pads, driving both street and track, keeping tally of track miles for hub changes as recommended by the factory. Now, will keep track of pad usage as well as mileage for rotor changes. Thanks again!
I would estimate PCCB's are good for 3 full pad sets with zero concern - but as you take your 3rd set of pads off, and put the 4th set on - I would get measurements or weigh the rotors against the values on the rotor hat - that is my personal policy from now on.
I also will be swapping pads at the 40% pad thickness from now on…and not get below 30% remaining pad thickness.
street use I see no need to measure the rotors - as I can't fathom how you could wear the rotors any measurable capacity with street driving.
Last edited by daveo4porsche; 09-16-2022 at 05:02 PM.
next time I do tires/brakes on any of these 3 cars I'm going to get the rotor's measured as base line
the Taycan will be interesting as it has 2/3rd's of a track day on it - 2 separate dates - but no more than 3 sessions each day - and only 1/2 of each of those 3 session before the battery overheated - so it has the equivalent of 3 full 25 min HPDE track sessions @ Laguna on it - so 2/3rds of a single track day in terms of "time on track". The rest of the time the Taycan is a 90% regen vehicle so pad/wear and rotor wear should be nearly non-existent.
Last edited by daveo4porsche; 09-16-2022 at 05:12 PM.
This is consistent with data I have from my 2016 GT3. Prior owner went through three sets of pads (but he would take them down to the pad wear warning going off). About 60 track days and 21k miles. I had a second set of PCCB rotors I cobbled together so I took the first set off and had them measured. 24-48% fronts and 75-85% rears. I ran my other set of rotors for a bit (85-90% all around) and then got a great deal on an AP set which is on the car now.
Summarizing the car when I got it a year ago:
first set of rotors
three sets of pads
second motor
Super helpful -- thanks for sharing. The whole "units of density" makes a lot of sense and I unfortunately have a rear rotor that is also the runt. Maybe this is more common than we think?
09-16-2022, 02:04 PM
now I need to go and check my hats!
