Discussion
The discs are usable up until the worn thickness reaches the dimension (thickness) declared by Porsche. This will be a cautious limit, meaning that in the real world, there is still some life left in the discs.
If you were to wear the discs well below the minimum wear limit, you might expect to notice reduces efficiency, fade and judder.
Check the discs yourself, with a micrometer if you need to and familiarise yourself with the limit dimension.
If you are swapping the pads, this is an ideal time to do this.
If you were to wear the discs well below the minimum wear limit, you might expect to notice reduces efficiency, fade and judder.
Check the discs yourself, with a micrometer if you need to and familiarise yourself with the limit dimension.
If you are swapping the pads, this is an ideal time to do this.
drmark said:
Not unless you are on second set of pads - you should get at least 50k in normal road use out of discs, often a lot more. Indeed corrosion most common reason for changing discs.
My 997 has done 48k I was told by my local dealer that they were ok as part of their visual healthcheck. When I bought the car the front disks were 33mm and rear discs were 27mm
Pads were 10% worn.
I have no idea what the sizes represent in terms of what they are new.
I've done 8k miles since then
In my experience disc wear is a relatively slow process unless you track a car. Consequently, annual Mot's and/or services tend to pick up on disc wear before it becomes an issue.
That said, given the manner in which Porasche discs corrode, they usually need replacing before they wear out.
That said, given the manner in which Porasche discs corrode, they usually need replacing before they wear out.
Should be easy to find the "new" thickness specs and the wear limit thickness specs, off the top of my head they are 34/32 and 28/26 for the front and rear respectively on a 996 Turbo, translates to 2mm of wear acceptable.
My rears were seriously worn, no tangible effects, there should not be unless things get extreme. It would probably be an MOT that catches you out before then.
If you shop around you will buy these items relatively cheaply and they are a simple swap for a DIYer or any backstreet garage so in reality replacing is not a big deal, but always replace pads too even if they are as new. So it's something you may want to do at the next pad change.
I don't believe anyone would reasonably get there, but seriously worn discs can break apart.
My rears were seriously worn, no tangible effects, there should not be unless things get extreme. It would probably be an MOT that catches you out before then.
If you shop around you will buy these items relatively cheaply and they are a simple swap for a DIYer or any backstreet garage so in reality replacing is not a big deal, but always replace pads too even if they are as new. So it's something you may want to do at the next pad change.
I don't believe anyone would reasonably get there, but seriously worn discs can break apart.
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