Hi,

Does anyone know the factory wear limit for the Front Discs on a 07 LS460 SE-L?

Mine are badly lipped about one millimeter each side of the disc. I took the car back to the dealer who supplied the car who say they are within the wear limits and therefore do not require replacement, but they look bad to me.

Any ideas. Thanks

[quote name='tony460' date='13 July 2010 - 10:57 AM' timestamp='1279015028' post='726169']
Hi,

Does anyone know the factory wear limit for the Front Discs on a 07 LS460 SE-L?

Mine are badly lipped about one millimeter each side of the disc. I took the car back to the dealer who supplied the car who say they are within the wear limits and therefore do not require replacement, but they look bad to me.

Any ideas. Thanks
[/quote]
The minimum thickness will be stamped into the disc itself. It may be on the inside. 2mm doesn't sound too bad. Its also unlikely that the discs will need replacing before 70k miles assuming that the system is working correctly and the car isn't driven hard all the time. Assuming that they are within tolerance, you could have them skimmed.

Other than the wear described, are there any signs of cracking, twisting or overheating (bluish tinge and/or lining materialstuck to the surface)? If so change them anyway, irrespective of the thickness.

[quote name='SteveLS400' date='13 July 2010 - 01:48 PM' timestamp='1279028911' post='726198']
[quote name='tony460' date='13 July 2010 - 10:57 AM' timestamp='1279015028' post='726169']
Hi,

Does anyone know the factory wear limit for the Front Discs on a 07 LS460 SE-L?

Mine are badly lipped about one millimeter each side of the disc. I took the car back to the dealer who supplied the car who say they are within the wear limits and therefore do not require replacement, but they look bad to me.

Any ideas. Thanks
[/quote]
The minimum thickness will be stamped into the disc itself. It may be on the inside. 2mm doesn't sound too bad. Its also unlikely that the discs will need replacing before 70k miles assuming that the system is working correctly and the car isn't driven hard all the time. Assuming that they are within tolerance, you could have them skimmed.

Other than the wear described, are there any signs of cracking, twisting or overheating (bluish tinge and/or lining materialstuck to the surface)? If so change them anyway, irrespective of the thickness.
[/quote]

Thanks, I was hoping to get the discs changed by the dealer as I have only just got the car. The discs are in good condition other than the depth of wear on them, a lot of wear for 25000 miles I think. They also produce a large amount of brake dust, the wheels quickly become dirty in a very short space of time. They work ok but feel a bit 'sticky' which is usually a result of the lip. Will probably have to grind it off or treat myself to new discs.

Some tyre shops will reskim the discs. They won't do it if it takes them under the minimum width though

[quote name='tony460' date='14 July 2010 - 03:31 PM' timestamp='1279117861' post='726346']
Thanks, I was hoping to get the discs changed by the dealer as I have only just got the car. The discs are in good condition other than the depth of wear on them, a lot of wear for 25000 miles I think. They also produce a large amount of brake dust, the wheels quickly become dirty in a very short space of time. They work ok but feel a bit 'sticky' which is usually a result of the lip. Will probably have to grind it off or treat myself to new discs.
[/quote]
Hi again

Loads of brake dust usually means that cheap pads have been fitted. I don't want to be alarmist but I do hope your mileage is genuine. I would expect to see only the slightest of disc wear after 25000 miles and would also think the original pads would still be good.

The twin issues - worn discs and non-genuine pads - are clearly linked and at least suggests hard braking. What does the brake pedal rubber look like? Wipe-off any dirt, it should be mint after 25k.

As I said before, the disc wear didnt seem excessive but that was before you told us the mileage. I think the stickiness you describe could be the problem here. Cheap pads are not up to the task but if they are OEM then even they will produce excessive dust if they are binding.

Assuming the dealer will not play ball, I think you would be well advised to seek the services of a specialist in your locality and get the brakes set-up properly. They will also advise re skimming. Please dont grind it off yourself.