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Why do my brake rotors wear out extremely fast?

Motor Vehicle Maintenance & Repair Asked on January 25, 2021

I have a Subaru Forester 2011. Yesterday I noticed passenger rear wheel is extremely hot and has a burnt smell, and sent the car to my mechanic. Today he told me he did not find anything wrong with the calipers and the pistons move well. The only thing he suspects is the brake fluid is dirty and need to be replaced. However as my calipers are in warranty, he will replace the calipers anyway. But he said I also need to replace my rotors.

We stay with this mechanic for five years since 2015. In 2018, I had front calipers and rotors replaced. In 2019 I had rear calipers and rotors replaced. The car is used by my wife and I for daily commute and we have ~8000 miles/year. So I asked him why the rotors need to be replaced so soon. He said he did not know and he said "Maybe it’s your driving habit". My wife did do hard brake sometimes. But I doubt if that will cause the rotors to wear that much.

My question is: Is it possible for a rotor to wear out in one or two year after driving only ~15000 miles? Is my mechanic cheating on me and should I go to another mechanic to do a check next time?

2 Answers

You can always go get a 2nd opinion. In your case, though, if your caliper was stuck (or sticking) and caused the brakes to overheat as you suggested, it is completely within reason the excess heat/wear presented to the rotor has caused it to fail (or become out of its tolerance range). This would mean it needed to be machined or replaced.

If the same mechanic has not given you a reason to doubt them to this point, more than likely they are giving you the straight scoop this time. To me it is reasonable to have them replaced, considering. When replacement is warranted on one side, you should really do them in pairs (on the same axle). They could possibly have the rotors machined to get them back into tolerance, if there is enough thickness to the rotor to allow you to do so. Usually, though, it costs just a little bit more to replace them than it does to machine them, so the better option in my book is to just replace them and be done with it.

Correct answer by Pᴀᴜʟsᴛᴇʀ2 on January 25, 2021

there are several issues to this problem.it can be driving style,sticking caliper pins,caliper not fully releasing,restricted brake hose and if your subaru has an electronic parking brake that is bad.also in some cases a brake pad can get jammed in crooked and wedge itself against the rotor.

Answered by mark on January 25, 2021

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