thunderhill

My 992C2S got the brake-wear warning light after 9K miles including 5 track sessions. After some research, I decided to go for Ferodo pads, DS2500 since the car is driven about 7:3 for public winding: track. In my previous brake jobs, I replaced rotors with pads, but a front rotor is >$400 for this car. So, I had my rotors resurfaced to save money. I will see if the recycled rotors are good enuf for track duty.

The new parts:
Pads: Ferodo 4664H(front) & 4713H(rear)
Fluid: Castrol SRF - 1L bottle was enuf.
Wear sensor: 9P1-907-637-B(front) & 9P1-907-637-A(rear)



The old parts:
The rotors didn't look too bad, but those had lots of grooves.

The stock pads were Pagid's.



The process:
There are several youtube videos for 991 brake jobs. 992 was no different from especially 991.2. The only difference I noticed was the rear caliper has a bracket for the sensor cable like the front one in 992.

The resurfaced rotors:
The measured thicknesses of the rotors when new were 34mm(F) and 28mm(R). After resurfacing, 33.25+mm(F) and 27.30+mm(R). Somewhere in Rennlist, there was an article that said the minimum thicknesses after resurf were 32.60 and 26.60. So, I think mines are within the spec. Saved the money here.


I tried to recycle the wear sensors, but the friction material of the cables were so fragile and it got broken when I tried to pull it out. I only saved 1 cable among 4. Hey, this cable is $35 each!

After reinstalled.


Now, ready for the next track day!

mksz51

THANK YOU for posting something "technical" with awesome pics. I love this stuff and do most of my own service work. Great pics and information!!!
Was there any issue with turning a drilled rotor? I've heard that can be an issue but from your pics it appears they are chamfered fairly "deep" to allow ease in turning.

wannarun

Thank you for sharing the information. I measured my pad thickness yesterday after 5400 miles and a few track days. The rears were down to 0.236” and will require replacement before the first track day this spring.

I will be doing the same pads and rotor resurfacing as you.

thunderhill

Yes, I had the same concern about the cross-drilled rotors, but the mechanic didn't complain about that. I think those holes don't really matter for resurf.

RRich

I got brake wear sensor cables from Amazon ($8.78 each). They looked to be identical to the ones I removed. However, since I track my car and check pads visually I cut the wires just beyond the plug, and soldered the wires together so I don’t get brake wear indications.

https://www.amazon.com/gp/product/B0066QWKPU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B0066QWKPU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

thunderhill

Thanks! I never knew amazon sells the sensor cables. It looks like 7L0907637C is for rear and 7L0907637 is for front.
Next time, I will have to just make them short-circuited too since I check my pads frequently.

aggie57

Thanks for this thread. I did my pads Sunday, at 10,800 miles and 2 track days. There was plenty of pad left on the front but the rears were getting close to the sensors. Like you say its a pretty easy job, once I’d figured out that the reservoir filter insert is an interference fit.

I put in DS2500’s like you, already the pedal feels firmer although they are squealing a little. Maybe after some use that’ll disappear. It was able to reuse the sensors though, just used some needle nose pliers to pull them out.

westsiderkg

How's your brake dust with these new pads?

991.1 Guy

If you are tracking your car and checking /changing pads often, I would just zip tie the sensors out of the way and it will make the job 10x easier.

aggie57

To early for me to say yet, I'll let you know after the weekend.

aggie57

Here's the front left after maybe 300 road miles + 4 track sessions. Not bad considering, certainly less than the standard Pagid pads. But looking at this photo the rotors look to have taken a bit of a hammering. Need to look at those.

Laszlo_Laz

Nice!

BKAT

Since the car has an electric parking brake, did you need anything special to compress the rear pistons? I believe many cars with electric parking brake require software to put the pistons in a service mode.
How did you compress the rear pistons?

aggie57

The parking brake uses a drum internal to the rotor, doesn’t use the caliper. So no, nothing special needed there.

Orient Express

I have a 2022 992 Targa 4S and am looking for recommendations for "Dustless" or "Ceramic" Brake pads. Not interested in track use, just a daily driver pads that don't throw off minimum dust on the rims.