The Aptera Forum
I got over 70k miles on my 2014 and the rotor look like new. There's a hard coating (ferric nitride) that fights corrosion issues. Blended braking probably helps too. So there are methods to mitigate corrosion issues.
What is "bearings steel", is it corrosion resistant?
My 2013 had great looking front rotors until I looked at the inboard side! The rear get very little use and die a swift death. Any regenerative braking is bad and very aggressive regeneration (Aptera's primary goal is efficiency) and salted roads of the northeast and it's a disaster. My 1985 BMW K100 motorcycle has stainless steel rotors...not a peep of trouble or corrosion. My friend has a Bolt and he's given up on rotors...yearly replacement with throw away rotors. We can do better!
Same problem on my 2014 Chevy Volt. Only replaced rear rotors once here in NJ after ~77K miles. Now I try to member to occasionally put the car in neutral while going down a hill so to use the real brakes to rub the rust off, especially after driving in wet weather.
In what salty place does your friend with a Bolt live?
@Harry Parker Duanesburg, NY, in the hills. Good idea-the neutral thing...it's not something all drivers can remember or get used to doing...not a cure-all...and I only occasionally drive that car, not primary driver.
I have a BMW i3 and live 200 steps from the Pacific Ocean. I have not seen any corosion on any of the rotors. You may know that the brake regen is fairly strong on these cars. Some i3 forum member got 175,000 miles on his rotors. Even with strong regenerative braking, the car does need mechanical braking once in a while.
My 2014 Camry Hybrid uses very strong regen braking, and I have not seen any problems with the brakes (yet). Almost 90k miles now.