Disk Wear

[DannyLee]

Morning all,

I have a ROW (UK) 1999 C4 Cab 996.

Front disks were replaced around 2.5 years ago by a previous owner.

Just failed my MOT with pitted front disks - inside of disks very pitted, outside not pitted, just shiny pad wear.

Is it normal to have to replace disks this often?

Previous owner didn't use it that often, I use it every day.

Could the caliper(s) be stuck, so as not wearing the inside faces of disks.

I have entrusted the rapair to a non-porsche garage, just my local.

Is there anything I/they should know or look out for?

e.g. type of fluid

Its a C4 so has the high pressure system, does this need any special considerations to bleed etc?

Your help would be much appreciated.

Rear disks show some pitting and both rear tyres needed soon, so further bills on the way I feel...

Danny

[phillipj]

If you don't track the car go with OEM rotors and pads. The rotors are very reasonable online. If you go aftermarket rotors the hubs may rust if they are not powder coated. (I think Zimmerman may have fixed that problem.) I don't see the reason to go aftermarket when the OEM rotors good and reasonably priced.

Call whoever you trust at Porsche and they will tell you exactly what parts you need to do a proper job.

Make sure to get the backing plates and shims (to prevent squeaking.) Also buy the new caliper bolts. Some people try to save money by not replacing these things but they are very inexpensive (in the U.S.) and will ensure you do a proper job (so you don't have to do it again.)

I buy all of the parts my self online (OEM Porsche) and have my mechanic install them. He only charges me $125.00 for labor for the fronts.

Hope this helps.

Phillipj

Edited December 12, 2008 by phillipj

[DannyLee]

The work is now done, at a cost of 450 GBP.

Looking back that the old receipts - the same job was done 20K miles ago - front disks and pads 1000GBP at Porsche specialist.

Garage said caliper pots were free, so no explanation why the insides only should be pitted.

Danny

[Richard Hamilton]

Looking back that the old receipts - the same job was done 20K miles ago - front disks and pads 1000GBP at Porsche specialist.

If that was an Independent Porsche Specialist, how come they charged 50% more than an Official Porsche Centre?

http://www.porsche.com/uk/accessoriesandse...servicepricing/

The inside faces corrode really badly, especially if the car is used infrequently. The amazing thing is how bad they can get without being able to feel it through the pedal.

[KevinMac]

Looking back that the old receipts - the same job was done 20K miles ago - front disks and pads 1000GBP at Porsche specialist.

If that was an Independent Porsche Specialist, how come they charged 50% more than an Official Porsche Centre?

http://www.porsche.com/uk/accessoriesandse...servicepricing/

The inside faces corrode really badly, especially if the car is used infrequently. The amazing thing is how bad they can get without being able to feel it through the pedal.

Heck mine rust right up right after I wash the car! Always drive it and apply brakes after car wash!