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As I see it you have two problems, excessive rotor wear and uneven rotor wear. They may both be related.
I've seen uneven wear from the outside of the swept area to the inside. A ridge usually develops on the outer edge of the rotor and a lesser ridge on the inside diameter of the rotor. A corresponding chamfer is developed on the pad. I've used a hand 4" grinder in the past to knock off the outer edge on the rotor and just lived with the inner edge..a few brake applications will even out the new pad. Since the ridge is the original material, the rotor will of necessity be thinner in the middle.
The real problem is poor rotor life...you got 47K with the first one and 47K bling bling!! with the second set. Hmmm...could also be a driver/car/enviro problem...do you have an automatic transmission and drive a lot in urban driving? Or maybe just coincidence. At least there's not traction control on this car which can REALLY wear brake pads and rotors on driven wheels (ask me about a certain someone's 960 volvo w/traction control).
Round up the usual suspects...hanging up caliper pistons and slide bushings and to a lesser probability failed rubber hoses to the front caliper (they have been known to fail internally and act as one way valves, keeping pressure on the brakes after releasing the pedal).
FWIW, our 2000 Audi 4.2A6Quattro ate a set of rotors and pads (eight pads on the front, four on the rear) at 32K in normal in town and highway driving. No warped rotors (which have been known to cause problems) but still fast wear. I checked the Audi CD I have for wear limits and the
@#$@!#% rotors have a 2mm wear limit on the thickness. That's only one mm per side which almost guarantees rotor replacement with pads. I dunno what the OEM and service limit thickness on your Saab rotors is, but if it's not more than 4mm there's one reason for worn rotors.
posted by 198.26.7...
, Mon, 31 Mar 2003 20:38:53
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