991.2 GT3 Brakes - Page 2 - 911/Carrera GT - PistonHeads UK

Hey, The brakes on my 991.2 GT3 (steel brakes) aren't great and at service late last year they recommended discs and pads all round. Symptons when driving hard are a drumming noise under hard braking. Im also getting biblical quantities of dust coming off them which im assuming is the PFC331/332 pads but could also be disc condition. Its done about 6k road and 5-6 track days last year and will likely do the same this year. So options, and there appears to be a lot so asking for advice.... My objective is 80% road 20% track, good bite but willing to put up with cold bite being lower. Dont mind squeling but the insane dust I get now id like to reduce. Some options based on the Design911 pricing and id be interested in where youd put your money. This is just parts, no fitting, nor bits like sensors etc. 1 - Porsche OEM 4x Discs and std pads all round £4,795 2 - Sebro OEM Spec x4 Discs and Textar pads all around £2474 3 - Sebro OEM spec x4 Discs and Pagid RSL29 pads £3263 4 - PFC v3 x4 Discs and x4 PFC11 Pads £3574 OEM looks expensive, Sebro im told is basically OEM spec? any thoughts on that?; if not Sebro then PFC complete package looks good and is supposed to be a big upgrade plus later disc swops are pretty cheap as you can do without the hats. For info, car doesnt have warrant so not bothered on non-oem parts.

I cant comment on Porsche brakes specifically, but I've run PFC discs on my CSL for a few years & have just bought another pair of replacement discs (discs only, no bells) Alyn at AS performance was the best priced & has stock on the shelf. And he is a nice guy to deal with. [email removed] Ignore their website as it is out of date.

I’ve used the oem, PF, Alcons and Pagid gear on my old 997 GT3. Personal preference was PF discs believe V3 is the spring loaded version I only had V2. Next time round you keep the bells and just do the discs which gives a saving. Pad wise I preferred the Pagid 29 to the PF offering as less dust but more importantly is they are glued and pinned to backing plate so if they over heat the pad material doesn’t brake off.

PFC set up is very good. I ran it on the front of my 992.GT3 (Fearnsport advised leaving the rears OE/ OEM). But PFC 11 is much dustier than other options.

I have just had Manthey pads, lines and fluid installed and pickup today so can't comment on the improvement just yet. My car was under warranty and had new front discs already so this seemed a sensible try. The OEM brakes which were in good order weren't bad but my main complaint was a bit of spongy travel at the top of the pedal and a lack of initial bite from the pads both of which are helped by the lines/pads respectively from what JZM (who is doing the work) told me. We'll see!

Thanks for the help all, I’m leaning towards the PFC setup although I’m still a bit concerned it will be too dusty. I’ll give that shop a bell, thanks for the tip.

I've been using Alcon and PFC08 pads for years. Brilliant setup in terms of performance. Don't forget brake lines and fluid.

I've not personally used them, but your usage seems to be a match for the pagid rs29?

My good friend and racing team mate for many years is epic on the brakes and it is more how you use them . Porsche parts are more than adequate even for the best of the late brakes especially on road tyres , Cup 2 . Maybe just RS 29 and good fluid if you already are a demon on the brakes

Definitely no more than average, but the price difference between option 3 and 4 leans me towards the PFC stuff, what do you reckon?

I changed Discs and Pads on the Fronts in about 50 mins with my friend whilst having a chat , so not a big job , but you need a breaker bar and torque wrench ( Long ) for centre locks . PF is a great product , reason I stuck to Porsche parts was to maintain warrantee ., so yes PFC good route

Design 911 often charge more than an OPC, by a shocking amount sometimes, so worth checking. Also some OPC's give 10% parts discount if you're a PCGB member. Cheers,

Their website is just rather good for finding part numbers ...

mikeh501 said: ... The brakes on my 991.2 GT3 (steel brakes) aren't great and at service late last year they recommended discs and pads all round. Symptons when driving hard are a drumming noise under hard braking. Im also getting biblical quantities of dust coming off them which im assuming is the PFC331/332 pads but could also be disc condition. Its done about 6k road and 5-6 track days last year and will likely do the same this year. ... Before buying anything I would verify what your actual brake wear is? Are the pads and discs actually worn to the point of needing replacement? FYI the drumming noise under hard braking is a feature of the standard brakes on a 997 GT3, so a 991 might be the same. When the previous owner of my car bought it from an OPC back around 2010 he noted the noise on a test drive, got the OPC to replace the discs and pads as part of the purchase and then found they made no difference to the noise! That was road driving only - he never took the car on track. I have had Pagid RS29s on standard discs on my 997 for several years (and maybe a dozen track days) and they are really excellent. There was less drumming noise with these pads too. They're still pretty dusty though. Cross drilled discs filling up with brake dust gets annoying....

Thanks Braddo, besides my thoughts my local indi said they were toast after a visual inspection and I took his word. The issue he said is that discs are visually worn with ridges down the disc surface which you can feel. He thinks the pads were put on without changing the discs and they are wearing unevenly. This is borne out of the history, where these pfc pads were put on in 2023 and the discs are original. Car has done 16k miles now, and I’ve personally done 5 track days in 2024

They certainly dont look great! and pads have id say 3-4mm on them. Edited by mikeh501 on Wednesday 15th January 15:47

Agree but surprised there’s no star cracks from the holes the old 997 discs were bad for that

FL Racing said: Agree but surprised there’s no star cracks from the holes the old 997 discs were bad for that Agreed i'm surprised you didn't pick up a load of cracks on the rotors tbh. would say any 'good' floating grooved rotors would do the job (ie any of the usual suspects, alcon/pfc etc) and much better than OEM/drilled and a decent pad will do for what you're looking for. Dust probably is governed more by the choice of pad, personally I've gone for pagids rather than PFC out of familiarity although I keep on meaning to change to endless ma45bs but i just haven't been able to time needing to change all the lot at the same time so have been a bit lazy (or cheapskate) to do that switch just yet.

Spoke to a few specialists today. One of them warned of rattle with the pfc v3 discs when cold. Anybody seen this?

Basically… there are 2 versions of spring. Used to be something like 2 coil and 3 coil, but they used to not be interchangeable. So if you had a 2 coil rotor, you could not just fit a 3 coil spring and vice-versa. Overtime the 2 coil spring got weaker with heat, and then you developed the rattle, as the rotor can fully float axially But seems that PFC have been to product marketing school and learned if you cannot fix it… feature it! Lol. They now call it Street and Race versions! Just make sure you get the right version. You really want to make sure you have the street version and not the race car version. Also have a couple of fresh springs handy to do a quick replacement if it does start. Thats what I used to do anyway. As for the braking performance and durability of the rotors… I found them to be excellent on my 981 GT4 paired with Pagid RSL29 pads. Edited by TDT on Wednesday 15th January 20:56

mikeh501 said: They certainly dont look great! and pads have id say 3-4mm on them. Interesting (good) that these discs have fewer holes than the 997. The 2 smaller holes near the outside of the disc are wear indicators, possibly? In which case the discs might have life for another pair of pads but best to trust the specialist. On the other hand I'd be more wary of an OPC telling me I need new discs and pads

992 GT/RS and 718 RS only have dimples now. No longer drilled through, so the small cracks should be a thing of the past and you can utilise full rotor thickness. Fronts up to 408mm.

Yes, a big improvement ... I wonder why they didn't always do that ... the same as grooves, except that they sometimes grooves cheese pare the pad material ...

Does anyone have a discount code for Design911? I need 4 brake discs and a discount would be nice. No one else seems to have all 4 discs in stock.