Date: Mon, 06 Mar 2000 23:50:13 -0500
From: Four Weis <mweinopsamcom>
Subject: Re: 9-5 Rotor Life


Is your 9-5 an automatic transmission? I have heard the same complaint with Volvos and Toyotas when the transmission is an automatic. The theory I have heard is that while a manual can slow down using the engine (via the solid connection through the clutch), the automatic coasts, therefore requiring the application of the brake for any slowing down. This heats up the pads and rotor and when the car comes to a complete stop, more brake pedal pressure must be maintained to keep the car from pulling forward, causing the hot rotor to cool down unevenly(only one area has pressure from the pads), resulting in warped rotors sooner. A manual transmission in neutral does not want to pull the car forward like an automatic in Drive, and requires less brake to keep the car stopped. You could also have a brake system with sticking calipers, master cylinder valves etc that is not releasing the pressure on the pads. This would create the effect of riding the brakes. One thing you should do is get a micrometer and find out the specification for the thickness of new rotors and the minimum thickness after turning. An example is the data for the Girling ventilated rotors for a 1986 900 - thickness new disc=20.0mm, minimum thickness after turning=18.9mm. Next time, ask for the old rotors and use the micrometer and find out if the dealer is tyring to take your money. I have found that old rotors make great lamp bases, either under a decorative cover plate or cleaned up and on their own. Scott Turnamian wrote: > Hello: > > I have a 1999 9-5 (got it in Nov 1998). It has 20,500 miles on it. I just > had to replace the front rotors. The dealership tells me that 9-5 rotors > are so thin to begin with that they can't be turned. This seems awfully > early to be replacing rotors. I don't race, autocross, ride the brakes, or > abuse the car in any way. Most are highway miles. I've had a couple of > Mazda 626s that only required one set of new rotors in 160K miles. > > Any thoughts? > > Scott Turnamian

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