gt3 master brake cylinder
#16
Rennlist Member
I agree with hoopumpers -- I did upgrade just now to the GT3 master cylinder but let's put things in context -- my stock system 987 system is quite adequate, both for street and track. I never had the pedal sink to the floor or any other problem.
mhm993 (who is a long-standing friend of mine) must have a problem with his setup.
mhm993 (who is a long-standing friend of mine) must have a problem with his setup.
#17
Rennlist Member
What everyone is talking about is pedal feel. The brakes are more than adequate to do the job on track. The pedal staying firm is (mostly) fixed with the GT3 master cylinder.
Its slightly bigger than the PCCB so it worth it to get the GT3 one. You can get the "generic" from ECS and save a bunch of money (they actually make the Porsche one and then Porsche brands it and sells its for 2x the cost).
The other issue I believe is overheating of the brakes... some get bigger discs (Girodiscs), GT3 brake ducts help, but I think putting a air duct from the fog light opening to the front brakes are the better solution.
Its slightly bigger than the PCCB so it worth it to get the GT3 one. You can get the "generic" from ECS and save a bunch of money (they actually make the Porsche one and then Porsche brands it and sells its for 2x the cost).
The other issue I believe is overheating of the brakes... some get bigger discs (Girodiscs), GT3 brake ducts help, but I think putting a air duct from the fog light opening to the front brakes are the better solution.
#18
Nordschleife Master
What everyone is talking about is pedal feel. The brakes are more than adequate to do the job on track. The pedal staying firm is (mostly) fixed with the GT3 master cylinder.
Its slightly bigger than the PCCB so it worth it to get the GT3 one. You can get the "generic" from ECS and save a bunch of money (they actually make the Porsche one and then Porsche brands it and sells its for 2x the cost).
Its slightly bigger than the PCCB so it worth it to get the GT3 one. You can get the "generic" from ECS and save a bunch of money (they actually make the Porsche one and then Porsche brands it and sells its for 2x the cost).
The other issue I believe is overheating of the brakes... some get bigger discs (Girodiscs), GT3 brake ducts help, but I think putting a air duct from the fog light opening to the front brakes are the better solution.
#19
Former Vendor
4forme did a DIY and did an awesome job, I posted the link below.
https://rennlist.com/forums/987-981-...-cayman-r.html
https://rennlist.com/forums/987-981-...-cayman-r.html
#21
Rennlist Member
The car stopped fine with stock. The driver hated the feel.
#24
Nordschleife Master
#25
yeah. for road use it is fine.
on track, you are compromised by the longer, mushier travel (yes Joe, you win) which i must say affects confidence. The PCCB brakes are not bad at all compared to the standard brakes and are in between those of the GT3s.
On the road, it is harder to heel and toe with the GT3 brakes, which I presume is why porsche did it for the spyder/Cayman. For road only use, I wouldn't switch it if you heel and toe. If you don't , it doesn't matter....
on track, you are compromised by the longer, mushier travel (yes Joe, you win) which i must say affects confidence. The PCCB brakes are not bad at all compared to the standard brakes and are in between those of the GT3s.
On the road, it is harder to heel and toe with the GT3 brakes, which I presume is why porsche did it for the spyder/Cayman. For road only use, I wouldn't switch it if you heel and toe. If you don't , it doesn't matter....
#26
Nordschleife Master
yeah. for road use it is fine. on track, you are compromised by the longer, mushier travel (yes Joe, you win) which i must say affects confidence. The PCCB brakes are not bad at all compared to the standard brakes and are in between those of the GT3s. On the road, it is harder to heel and toe with the GT3 brakes, which I presume is why porsche did it for the spyder/Cayman. For road only use, I wouldn't switch it if you heel and toe. If you don't , it doesn't matter....
Now, if only mrd_spy would join the dark side...
#27
Rennlist Member
Just drove my '11 Boxster S with the GT3 master cylinder installed for the 1st time.
Pedal feel is *completely* different -- was apparent at the first stop sign. Formerly the pedal would sink a bit before much happened -- now the brakes bite as soon as you touch the pedal. Whether actual braking performance is any better, I don't know.
I never suffered loss of confidence on the track with the stock setup -- I trusted it, but this does seem like a worthwhile investment.
Pedal feel is *completely* different -- was apparent at the first stop sign. Formerly the pedal would sink a bit before much happened -- now the brakes bite as soon as you touch the pedal. Whether actual braking performance is any better, I don't know.
I never suffered loss of confidence on the track with the stock setup -- I trusted it, but this does seem like a worthwhile investment.
#28
My dealer said that too but when I queried it with them they said they had never done one so didn't know if it would work, and that if I knew it would work (i.e knew of someone who had done it) they would be happy to do it.
IMHO it should be a standard fitment on 987.2's and certainly the Cayman R
IMHO it should be a standard fitment on 987.2's and certainly the Cayman R
who did the upgrade for you in the end?
#30
Pro
I want to do the GT3 master cylinder upgrade on my early build 2014 Cayman S (981S). Does any know if GT3 part number 99135513080 is the correct master cylinder. I believe there is 2 versions (w and w/o a brake light switch).
Thanks in advance for any help.
Thanks in advance for any help.