Rusted brake discs

[m7han]

I picked up my pony yesterday, and this morning I found brake discs were severely rusted. Rusts were gone after I drove my kids to school. Has anybody had same situation? Is it normal? Is there any way to keep them from rusting? Thank you.

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[generaltso]

That’s surface rust from rain, and is perfectly normal with all cars. The next time you drive, slip it into neutral before braking to clean it off.

 

[slimothyjames]

It's a bit extreme to call that extremely rusted. You haven't seen rusty rotors! ?

Just use your brakes more, and it'll clean off the surface. You will see this after it rains or you wash your car and let the water sit.

If it truly bothers you, you can buy aftermarket rotors that are coated/have treatment.

 

[HuntingPudel]

That’s surface rust from rain, and is perfectly normal with all cars. The next time you drive, slip it into neutral before braking to clean it off.

Yup, mine rust whenever I wash (it doesn’t rain here). Apply the brakes and the surface rust goes away. The only cars I ever owned that didn’t rust the rotors had hubcaps which were not conducive to cooling the brakes. ??

 

[breeves002]

This happens to any car with steel brake rotors (almost all cars). Completely normal nothing to worry about just drive the car and enjoy it.

 

[MoonRiver]

It only takes a car wash at your drive way and an overnight sitting to get a little rust like that. It doesn't affect braking in anyway. I don't think you even need to apply your brake to clean it, since the brake pads touch the rotors at all times if EVs in that regard are not different than ICEs.

 

[generaltso]

It only takes a car wash at your drive way and an overnight sitting to get a little rust like that. It doesn't affect braking in anyway. I don't think you even need to apply your brake to clean it, since the brake pads contacts the rotors at all times if EVs in that regard are not different that ICEs.

It doesn't even take an overnight sitting. Mine look like that within 10 minutes of getting wet.

In what car do the brake pads contact the rotors at all times? That would get very hot very fast.

 

[m7han]

Thank you all for the information and suggestions!

 

[MoonRiver]

It doesn't even take an overnight sitting. Mine look like that within 10 minutes of getting wet.

In what car do the brake pads contact the rotors at all times? That would get very hot very fast.

on all my ICEs their brake pads never completely separate from the rotors. You only need to jack up the wheels, turn them with your hands and listen to the rubbing sounds from the rotor, that's the pads rubbing the rotor. If they were separate ever 1/10 of inch you wouldn't hear anything, unlike your bicycle. The difference is the pressure applied to the pads, braking or no braking.

 

[generaltso]

on all my ICEs their brake pads never completely separate from the rotors. You only need to jack up the wheels, turn them with your hands and listen to the rubbing sounds from the rotor, that's the pads rubbing the rotor. If they were separate ever 1/10 of inch you wouldn't hear anything, unlike your bicycle. The difference is the pressure applied to the pads, braking or no braking.

Physics imply that any part of the brake pad that was in constant contact with a spinning rotor would get worn away and produce heat in the process. But regardless, the blended braking system in the Mach-E is very different.

 

[MoonRiver]

Physics imply that any part of the brake pad that was in constant contact with a spinning rotor would get worn away and produce heat in the process. But regardless, the blended braking system in the Mach-E is very different.

theoretical it produces heat but by design the disc brake system has no mechanism to push the pads away, only releases the braking pressure to the caliper cylinder to drop the clamping force of the pads to the rotors, when brake pedal let go.
The heat you are talking about is rather small.

 

[MillieChliette]

Normal.

Put the car in Neutral and hit the brakes a bit. It'll be gone.

 

[MoonRiver]

Normal.

Put the car in Neutral and hit the brakes a bit. It'll be gone.

can you shift it to N when it's in D moving?

 

[OON7]

Surface rust is normal when rotors come into contact with water while parked on any car. Probably biggest difference is that EVs use the actual brakes less so it might take just slightly longer to clear the rust but it should be gone from virtually any drive.

Reading the title I almost knew immediately that the picture would show rain, years ago before I knew this was a normal thing I had the same question.

 

[generaltso]

can you shift it to N when it's in D moving?

Yes.

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