Help please! Every time I go to the track I need new rear brake pads...

[Njc102]

I've owned my 911 991.1 C2 for 9 months now - I love it. However, every time I go on a track day I pretty much wear through an entire set of rear pads. In the last 9 months I've gone through 3 sets of rear brake pads in the process...and I'm a little bit at a loss as to why! Here are some things I've tried to rule out:

- Brake Pad Manufacturer. 1st set were OEM, 2nd were Brembo, 3rd were Pagit.
- Bedding in brake pads. All were bedded in, either by me or a specialist Porsche dealer
- PSM. For the last track day I turned off PSM (assuming it was braking for me all the time and I didn't know).
- Driving Style. I've had driving instructors in all track days - only positive feedback about my braking style

I've done a track day in another Porsche (Cayman 2s) and had no brake issues. My front pads are also like new - no real wear at all (they were new when I got the car)...everything I've read suggests that front wear should be greater than rear. My rears are always much hotter than my fronts.

I'd appreciate any thoughts? Has anyone else had a similar issue?

(photo at Silverstone yesterday - 25th July 23 - great day out with Porsche Club GB!)

 

[Lancerlot]

Stating the obvious - either a) all vehicle systems are working correctly or b) something is wrong.

If a)- The torque vectoring system (where fitted) can wear rear pads prematurely on track. Not something capable of being disconnected, so resolve to fit harder friction pads.

If b) then check the braking system to include callipers, rotors, master cylinder, pedal box, fluid, any limiter valve etc. Cleary anything that preloads the rear brakes, sticking pistons, defective master cylinder, mal-adjusted handbrake, blocked hoses etc will need to be corrected.

Some food for thought anyway! []

Regards,

Clive

 

[salisbees]

I am surprised to hear your tale of woe. I have had my 991.1 C2S from new ten years ago and regularly use it on track without issue. In 40,000 miles I have only changed the rear pads once and when checked a week ago there was still approx 7k left in them. I am with Lancerlot's assessment and feel that it needs to be looked at by a specialist, not an OPC.

Hope this helps, yours
Howie

 

[Njc102]

Thanks Clive - appreciate your logical approach to this! I was wondering if I was missing something, but maybe not. Will probably add some harder pads for the rear when I next change them (which will be soon!) - but will likely take it in for some investigation too.

 

[Njc102]

Thanks Howie - your story is similar I get from other 991 owners...which makes be wonder what it it (either the car or me!). Useful reference points on your data - thanks! Will take it to an local Porsche specialist, not an OPC.

 

[matsleight]

Just ran a 991.1 C2S myself for last 4 years, approx 4-5 TD a year - I was basically changing either front or rear every other year - so approx 10 days plus a couple k road driving. So agree with others, there is something to be checked out there. Oem Pads.