Are my rear brake discs wearing prematurely?
I need some guidance on the expected life of the rear brake discs on my Lexus LS600hL. The car is three years old, has just completed 30,000 miles and is under extended warranty. On the 20,000 mile service (in December) it was noted that both the front and rear brake pads were only 20 per cent worn. However, during the recent MOT it was advised that the insides of the rear discs were badly corroded and needed to be changed at my expense. Can you tell me what would you expect normal life of rear brake discs to be?
Asked on 21 September 2012 by PW, via email
Answered by
Honest John
It depends how hard the car is braked. Discs corrode all the time if the car is left standing, especially overnight. 95 per cent of the braking of a car is at the front, so while normal braking cleans overnight corrosion off front discs, you have to brake hard to bring the rear discs into play and clean them up. I guess that this is even more of a problem with a big hybrid because of the amount of regenerative braking taking place. It's probably an unforeseen consequence of the design of the car. Will note in www.honestjohn.co.uk/carbycar
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