BRAKE QUESTION

thiggy · Post by **thiggy** » 25 Oct 2004, 10:27

I have a 2001 V70XC. The car is new to me and I recently had the brakes relined. When I picked up the car, my mechanic (of several years) said that Volvo recommends that their discs not be turned. If they are scored or warped they must be replaced. Why is that? Are they too thin to turn safely? I have a slight vibration upon breaking at freeway speeds and would like to have them trued.

Post by **matthew1** » 25 Oct 2004, 11:58

I think it's an official Volvo recommendation, and given the, ah, "sensitive" nature of brakes and Volvos, I'd abide by it.

Tsquared · Post by **Tsquared** » 25 Oct 2004, 16:27

thiggy wrote:Volvo recommends that their discs not be turned. If they are scored or warped they must be replaced. Why is that? Are they too thin to turn safely?

Volvo recommends that their disc not be turned because they would like to sell you a new set of discs. There is a minimum thickness that the disk can be turned down to. The problem with turning the Volvo disc is that they are very thin to begin with, and a turned rotor is more likely to warp. You can turn them for a vibration and you will probably be OK as long as you stay above the minimum thickness. For gouges (when you don't change the pads early enough) in the disk you are better off getting a new set of rotors.

Early disc brakes had heavy rotors with plenty of material so that they could be turned a couple of times before they needed replacement. With a more performance and economy mindset reducing the spinning mass of a wheel is the result of many of today

thiggy · Post by **thiggy** » 26 Oct 2004, 05:20

Thanks for the information.