Pad deposit from sitting?

[Schmuck]

So I was rear ended 2 months ago. Only cosmetic damage. Fixed the bumper, etc and all of a sudden I'm getting heavy vibrations under braking of 60km/hr +. Got it checked out and dealer said rear rotors are warped and rear pads are nearly done. Do you guys think having the car sit for a month would cause pad deposit? Car wasn't vibrating at all before. Or is just a coincidence?

Wagner rotors and pads
26,000 km on them
rear pads 5 mm left
rear rotor 0.0021 inchs run out
fronts still good 7mm on pads and run out within tolerance

did some heavy braking at 80/90 km + and vibrations are significantly less but still there

OEM pad and rotors lasted me 50,000 km. Daily driver lots of stop and go traffic.

 

[Snicklefritz]

Rear pads wear out first by design, so I've heard. If you reduced shudder vibration by bedding procedure that means deposits. The only kind of sitting that can put deposit on a rotor is coming to a stop and holding the hot brakes, and they have to be really hot, like glowing hot or just shy of it to melt deposit onto the rotor. since they are done anyway replace the pads / rotors and see. If you get vibration, then the damage was more than cosmetic.

 

[D.J.]

More likely rust on rotors from sitting

 

[D.J.]

rear rotor 0.0021 inchs run out

just barely out of spec... (0.0001") out - per Kia Stinger: Brake System / Rear Disc Brake

 

[stoopid]

More likely rust on rotors from sitting

Exactly what I was thinking, or the caliper wasn't releasing fully/rebounding due to rust buildup causing the pads to make contact while driving. I'd think some brake cleaner sprayed liberally over the moving bits would be worth trying. Worse case you bought some extra brake cleaner for future use.

It's possible though, if what I'm suggesting were true, that in the time you've driven it that the rotors warped due to the increase heat generated by the pads constantly contacting the rotors. I would still clean everything then do a bedding process, only after that would I drop the coin on replacing things.