mdrums

Hi Alan, did you get my emailed pictures?

I'm using 6 piston 997 GT3 Cup some called them 996GT2 Cup (I get confused) #996.351.432.90 and 997TT rotors for Center Lock. Everything bolts right up perfectly.
I'm told my master cylinder is the same as a GT3 but the pressure plate ? is slightly different to give the GT3 and Cup cars a firmer pedal feel.

pete95zhn

So you saw the upright thrad on Renntrack...all offset issues were discussed there and you've also found correct discs for centerlock hubs too.

About that "pressure plate"...it's really the (vacuum operated) brake booster. GT cars have one with smaller diameter than turbos (and 4S) in 996 chassis, 997 turbos have tandem vs. GT's single. Thus the difference in pedal firmness.

mdrums

Yes Brake Booster....that is the word I meant. I don't know if it's needed or worth changing that to a GT3 type of not.

I think I read something over on Renntrack...need to go back and double check. I found that there is very few that know what they are talking about but after weeding them out and reading and studying and speaking with John at BGB in Daytona I got it sorted and got the correct parts.

utkinpol

no, it does not matter at all, keep your booster.
it is highly unlikely your master cylinder is same that is on gt3 car. gt3 has bigger internal bore diameter than MC on base and 'S' cars. bigger diameter means more liquid and less pedal movement - on a track it improves brakes pedal feel as it is easier to modulate. but it is not critical, so, it is up to you to change it or not. i would leave it as it is if you like pedal feel on a track now, when your current MC will be due for replacement (usually it is when it starts to leak - you step on a pedal with running engine and pedal slowly 'gives in' almost to the floor) simply get a gt3 version to put in.

congrats on your new brakes, how much did it cost you all?

85Gold

Oh Mike

You have really fallen down that slippery slope sways, upgraded shocks/springs and brakes. Doesn't sound like a lowly GTS anymore. You now have no excuse's for not running with da Dawg.

Peter

pete95zhn

PET has the same (997 355 910 30) master cylinder for 997.1 GT3/GT2/turbo/C4S.

mdrums

Pete is correct also Viperbob from the forum who did the work for me confirmed the MC I have is same as GT3 and its just the booster that is different.

mdrums

LOL I need dog bones and rubber suspension mounts a trailer and some Hoosiers more ballsy driving and the lowly GTS could really make people turn there heads.
DepDog has put his car on a diet and has been improving his driving a lot lately

Alan C.

Mike,

Thanks, I received the photos and information.