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Brakes: 996 Turbo: Advice please.

dhossack

dhossack

PCGB Member
Member
Hi,
I've got Porsche standard discs and pads on my Turbo and have found the following;

1. On track days my brakes start off fine but after a few laps begin to shudder and the steering wheel vibrates from side to side. I'm guessing the discs heat up and warp and this is the cause, although on fast road driving I never experience this. I never experience brake fade and after resting/cooling they are fine again for a few laps.
2. The outside/facing part of all discs are clean and polished but the inside of them is showing corrosion as if the pads aren't touching? Is this normal?
3. There always seems to be an excessive amount of brake dust on the wheels?

The above are not new symptoms but what I've experienced since having the car for the past six years and the brakes have been replaced twice all round in the last 4-5yrs. I'm doing 5-6 thousand miles a year and 3-4 track days. I'm happy all is well suspension/wheel/tyre wise as had recent rebuild by CG, a couple of new wheels and new tyres all round very recently.

Any pointers would be appreciated as I'm considering replacing the discs and pads soon?

Many thanks,
Donald.
 
Hi,
no-one experienced similar? Any advice on uprating the brakes and pads? Should the pads be touching the inside of the discs and do the calipers need a re-con?
Thanks.
 
Hi,

Did you get any answers to this as i've just had the same problem on my 996 carrera 2 running standards disks and paged blue pads, I think it is the discs overheating so i'm thinking of ditching the
standard porsche discs and going over to slotted like Tarox but still undecided.
 
Ricjard Hamilton will be here to correct this theory if it is incorrect, but if the calipers are similar to the 928 and 944 turbo , there is a phenomenum called palte lift, where road salt and moisture cause corrosion of the alloy under the stainless still liners of the caliper. These plates form shelves at the top and bottom of the pad slot that the pads rest on, and so stop the pad eroding the metal of the caliper away when the alloy gets hot and malleable. Eventually so much corrosion gets under the plate that the pad starts to jam, and by the time enough pressure has been built up to make the pad unstick the "free" pad is probably already pressing quite hard on the other sided. The disc is then distorted by unequal pressure, and of course because , usually for some reason, the inboard pad is not pressing hard on the disc surface the surface gets corroded.
The MOT tester remarked at how clean the inner surfaces were on my own 996T and indeed at bedford I was braking from 150 at the end of the long straight, before the kink with out a hint of judder, but three laps like that was enough to require cooling the brakes down , but in the cars defence it being my first one in the 911 I was probably slowing down too much for the corners.
 
I have been giving thought to why the inner face corrodes first and the only explanation I can think of is that the disc acts like a centrifuge drawing cooler air in throught the centre of the disc via the vents and trows it out of the perihpery of the disc, the action of drawing the air into the disc must draw wetness into the inbord face and away from the outboard face.
 
Decided to have the calipers re-furbed, new discs and pads etc fitted.

Have been looking at Pagid or Sebro as Euro Car Parts have a discount at present. Anyone any experience of those makes, as I say I only do 3-4 track days a year?

Many thanks.
 
I've always used Sebro disks and Textar pads, and never had a problem, but I don't do track days. However, I don't think there is much to choose between the standard Pagid and Sebro offerings. I expect you have to upgrade to something more tailored to track use to notice a difference, but it might compromise some aspect for daily use.
 
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