aggie57

Valid point but in a new car generally you'd expect this not to be an issue. Certainly in classes where brakes mods are limited the quality of the fluid is a key factor in braking efficiency. It's amazing how quickly fluid attracts moisture when subject to high temperature, and how many people don't change or even bleed it regularly.

I used to compete in classes that allowed no changes to brake hardware, so we ran factory standard 2-pot calipers in cars capable of 120+mph and weighing 2700-2800 lbs and we ran them in 6-hr events. DOT 4 fluid was fine as long as you bleed to clean fluid after each event.

ipse dixit

I did my runs on OEM Porsche brake fluid.

OEM Porsche brake fluid is DOT 4, which is more than sufficient for track duty. Of course, you can go better (SRF, Endless, etc.), the but OEM fluid is pretty good and more than capable.

French Blue

This is a simple fix.

Buy your wife something nice, and tell her that no, you do not love your car more than her.

Then she will stop trying to murder you by messing with your brakes.

John Mclane

Carrera brakes are not ideal for all tracks. Some are harder on them than others.

The combination of soft OEM pads, intrusive PSM, suboptimal rotor cooling and brake size makes it easy to boil fluid. At a minimum upgrade the fluid to SRF (if you can find) and consider different pads. Such changes have a trade in harder brake feel and noise, of course.

I share my car with my wife on the track and it took a beating with the OEM equipment. It's a lot of power and weight for those brakes. Being the first time with that car I did not change to PSM sport, but the rear pads were not overspent. The fronts were down to 40% after a track day (2 drivers).

I drove numerous laps at Barber during several PSDS, never had an issue with brakes, with the caveat that all 911s had ceramics (coincidence?). I think one needs the experience of boiling fluid to understand that driving like you stole it for prolonged time have consequences and it's one of the few things they fail to teach there, but it's understandable vis-a-vis risk/liability.

Vintage72

I am sorry to hear that and please keep us posted as I have steals on order with my 992 C2S and it will be tracked. And, I always run SRF.

hsmith

I suggest Castrol SRF brake fluid.

markchristenson

I will be curious to hear how this turns out. It sounds like a one-off, as Porsche brakes are generally top-notch and I've heard nothing (outside of your experience) to suggest otherwise.

ryandarr1979

Would atleast swap out pads and fluid and head back and see if you still have issues. I doubt it. Wouldn’t be surprised if Porsche changed both from 991 to 992 to shave some cost.

inastrangeland

Porsche had to change the brake pad composition due to environmental concerns. Not sure how this affects the brake. Definitely change the brake fluid. I always run this in my track cars, and even street cars. Flush after every track day.

https://www.motul.com/us/en-US/produ...0-factory-line

Ozy190

Did I read correctly that changing brake fluid to non-Porsche one voids the warranty?

inastrangeland

If you are worried about your warranty using a different brake fluid, even one that is way better than the stock Porsche fluid, you should not be on the track. Motul brake fluid is higher performance than the stock Porsche fluid..

Porsche reserves the right to deny warranty if you track your car and a part fails.

• Parts that fail due to lack of required maintenance or use of non-PCNA

distributed parts.

• Normal wear or deterioration of any part.

• Cleaning and polishing.

• Improper use or contamination of fuels, lubricants, or other fluids.

• Lubricants, unless part of a warranty repair.

• Air conditioner refrigerant charge after the first three months of service

unless part of a warranty repair.

• Glass breakage, chips and/or scratches that are not due to a defect in

material or workmanship.

• Appearance items that are not due to a defect in material or workmanship.

• Any car registered or normally driven outside of the United States and

Canada.

• The replacement of expendable maintenance items (such as spark plugs,

filters, worn wiper blades, worn brakes, worn clutches, worn tires) when

the replacement is not due to a defect in material or workmanship.

• The adding of any fluids unless they are needed as part of a warranty repair.

• Any car with an odometer that has been altered so that the actual mileage

cannot be determined.

• Dealer-installed accessories not distributed by PCNA. (Refer to the

Replacement Parts and Accessories Limited Warranty in this Booklet.)

• Wheel balancing and wheel alignment beyond the first three months of

service unless part of a warranty repair.

• Unauthorized modifications or vehicles with total loss or salvage titles.

• Modifications not authorized by PCNA.

• Service adjustments (such as idle speed, air/fuel mixture, brake, clutch,

headlight, and drive belts) beyond the first three months of service unless

part of a warranty repair.

• Improper repairs by someone other than an authorized Porsche dealer of

PCNA.

• Abuse, accident, acts of God, competition, racing, track use, or other

events.

Note 1: Components and/or parts that fail during racing or driving events

(including Porsche sponsored events) may not be covered by the new car

Limited Warranty.

Note 2: You should also be aware that PCNA may deny you warranty

coverage if your vehicle or a part has failed due to abuse, neglect, improper

maintenance or unapproved modifications.

loneregister

It it possible you have a warped rotor which is vibrating the pad away from the rotor, thus increasing distance traveled?
Might be an easy check if you can get the car up on a lift and turn the wheels/rotors to see if there is any warpage.

Ozy190

Bear with me, first Porsche.

All this sounds stupidly restrictive. I've always heard of Porsche being a track friendly brand.

ryandarr1979

Due to Magnusson-Moss Act, Porsche won’t and cannot void your warranty for use of aftermarket parts or fluids alone, but they can and will deny coverage for the repair or replacement of a part or parts if Porsche can prove that the failure was caused by the non OEM part/s or fluid/s.

JesseRohr

Update:

The service manager had me and their tech go attempt to replicate the on-track issue and were able to do so after about 30 mins of hard driving on a very windy nearby country road outside of town. He took some measurements of fluid temp, caliper temp, rotor temp, etc. Because my local dealership also services all of the company Porsche cars for Barber he had some interesting info. The first round of Porsche Experience cars for our location all came originally with steel brakes and were constantly in for brake related issues. They are now all equipped with PCCB and the first round of cars were shipped off somewhere or sold as demo cars. His opinion is that the front rubber portion of the brake lines is an inferior design to the 991 and upon excessive heat and abuse the rubber gets too soft and expands, creating a problematic issue with pedal feel and caliper compression (hence the dead pedal feel). This is his opinion and was going to research if the parts have been updated during production and if so, get my car some new brake lines. He stated I replicated a problem with another 992 C2S from a few months ago, all the brake lines were replaced and two new front calipers. Getting Porsche to allow it was the biggest hurdle at the time to get the car on the road again.