What a fortuitous thread!

My brake wear light came on for the first time when I pulled into work this morning. My 1991 300CE has 119m. I checked the service records from the PO and the car had new front rotors and new front and rear pads at 94m and again new front pads at 104m. If it is the front pads that need replacing, is that typical wear, only 10-15k for front pads? I don't drive hard by any means. I notice when looking past the front and rear wheels that the rotors have a lip all around the outer edge. Is there an easy way to measure rotor wear without buying a special tool like a micrometer?

Thanks,

glenmore
1991 300CE