986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - How to tell if its time for a brake pad change?

MNBoxster · 03-02-2006, 06:03 AM

Hi,

You actually should change out your Pads before the Wear Indicator comes on. First, you don't need to replace the Wear Indicators, but second, by the time the Wear Indicator does light up, your Braking Efficiency is reduced.

But, you should also check the Rotors as well. The Pads should be changed when the Pad material (not including the Steel Backing) is down to 10.0mm (0.39") for the Fronts or 8.5mm (0.33") for the Rears. The Rotors acceptable wear limit is 22.6mm (0.89") for the Fronts and 18.6mm (0.71") for the Rears. You'll need a Micrometer to properly measure both the Pad and Rotor Thicknesses.

Also, if the Rotors are cracked or deeply scored, or if Runout exceeds 0.03mm (Free or 0.06mm when mounted on the Hub), these should also be replaced. Hope this helps...

Happy Motoring!... Jim'99

03-02-2006, 06:03 AM	#2
MNBoxster Registered User Join Date: Sep 2005 Location: Minneapolis/St. Paul, Minnesota, USA Posts: 3,308	Hi, You actually should change out your Pads before the Wear Indicator comes on. First, you don't need to replace the Wear Indicators, but second, by the time the Wear Indicator does light up, your Braking Efficiency is reduced. But, you should also check the Rotors as well. The Pads should be changed when the Pad material (not including the Steel Backing) is down to 10.0mm (0.39") for the Fronts or 8.5mm (0.33") for the Rears. The Rotors acceptable wear limit is 22.6mm (0.89") for the Fronts and 18.6mm (0.71") for the Rears. You'll need a Micrometer to properly measure both the Pad and Rotor Thicknesses. Also, if the Rotors are cracked or deeply scored, or if Runout exceeds 0.03mm (Free or 0.06mm when mounted on the Hub), these should also be replaced. Hope this helps... Happy Motoring!... Jim'99