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Brake Fade?

Lancerlot

Lancerlot

PCGB Member
Member
Well now, after the first really spirited session of swift motoring in sports mode in my 997TT last week (now covered 2,000 miles), I suddenly missed a braking point that seemed to be attributable to brake fade. It only happened once, but I was very surprised this should occur at all at highway speeds - even though I was hiking it a bit over Exmoor and do employ left foot brake. Speeds were low compared to the track and should have been well within a turbo's capability.
Anyone else suffered brake problems?
Regards,
Clive
 
ORIGINAL: Lancerlot

Well now, after the first really spirited session of swift motoring in sports mode in my 997TT last week (now covered 2,000 miles), I suddenly missed a braking point that seemed to be attributable to brake fade. It only happened once, but I was very surprised this should occur at all at highway speeds - even though I was hiking it a bit over Exmoor and do employ left foot brake. Speeds were low compared to the track and should have been well within a turbo's capability.
Anyone else suffered brake problems?
Regards,
Clive
Click to expand...


That's bizarre if you ask me....

I was with a Porsche technical guy last week, and he was telling me that all new model Porkers have to under go a brake test, which
consists of 18 continuous emergency stops from 3/4 max speed, quite some test IMO, and if they feel fade on the pedal, it's
back to the drawing board....

Assume you have steels ??, i have never really tried left foot braking, but was there any chance you were
dragging the brakes with you left foot, that's the only possible reason i would have thought they could get hot enough...

G.
 
ORIGINAL: glenn mcmenamin

Assume you have steels ??, i have never really tried left foot braking, but was there any chance you were
dragging the brakes with you left foot, that's the only possible reason i would have thought they could get hot enough...
G.
Click to expand...

Hi, thanks for the response. No not pedal dragging. There's just a chance the pads were undegoing their final bedding in, although 8 laps of the Nordschleife should have already sorted that out. The pedal also went long but reverted back to normal travel after a few miles.
Think I'll get the OPC to check it out.
Regards,
Clive
 
ORIGINAL: Lancerlot

ORIGINAL: glenn mcmenamin

Assume you have steels ??, i have never really tried left foot braking, but was there any chance you were
dragging the brakes with you left foot, that's the only possible reason i would have thought they could get hot enough...
G.
Click to expand...

Hi, thanks for the response. No not pedal dragging. There's just a chance the pads were undegoing their final bedding in, although 8 laps of the Nordschleife should have already sorted that out. The pedal also went long but reverted back to normal travel after a few miles.
Think I'll get the OPC to check it out.
Regards,
Clive
Click to expand...

Yes, a check at OPC is advisable IMO.

As for long pedal, change the brake fluid to Castrol SRF, it's prob the best stuff out there, with poss the
highest heat tolerance.
All serious trackdayers use it.


G.
 
I've had some good blasts around of late but nothing similar to your issues that I've noticed....!

garyw
 
Today I noticed that at rest with the engine running I can almost push the pedal down to the floor. Seems to me like there may be air in the system, although the brakes appear to operate OKduring normal urban driving.
 
I've had no complaints with brakes although the ABS seems to have a much higher threshold before cutting in with sport on.
 
Just come back from my OPC today after having the braking system thoroughly checked out.
Nothing really to report as far as the mechanical side is concerned, but the technician agreed the brake pedal was operating a little long.
The upshot is that the brakes were bled and the fluid renewed. On the way home the brakes did feel a little firmer and seemed to have improved initial bite (although this may be psychological!) Anyway we'll see the next time I give her a real workout. [;)]
 
Following a session at Millbrook, this braking issue may now be clarified. It seems that sudden throttle lift causes the brake system to prime and preload the pads in anticipation of a sudden braking manoeuvre. Result is slightly increased pedal travel.
Switching into sports mode cancels this and produces a firmer initial pedal.
I have a lot more confidence in the system now.[:)]
Regards,
Clive
 
ORIGINAL: Lancerlot
Following a session at Millbrook, this braking issue may now be clarified. It seems that sudden throttle lift causes the brake system to prime and preload the pads in anticipation of a sudden braking manoeuvre.
Click to expand...

This was part of the new technology for the 997.. I didn't expect it to cause that though [&:] (pedal dropping so far down)

I'm assuming you had a wonderful time at Millbrook, how long did it take to get your invite from the OPC ?
I'm keeping check that I don't miss my chance to return [;)]

garyw
 
Gary,
I think it's all relative. I was on a very twisty road, frequently coming off the throttle and dabbing the brake pedal (left foot) and had not previously driven the car on this type of road in such a manner. The answer of course is to turn on sports mode which immediately eliminates the preset.

Millbrook was good. I was originally invited just after the Turbo launch and my first visit was in September. Unfortunately I could not complete the course due to illness and was invited back there in November but was unable to attend. I finally managed it earlier this month. On average there seems to be about a 2 month lead time.
Regards,
Clive
 
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