Bad Caliper?

[mcfarlrm]

Noticed rust build up today on my rear driver side rotor. No other rotors have build up. No visible leaks, pinched lines, etc. Has anyone else experience this issue?

 

[UNBROKEN]

Maybe just that one got water on it. All rotors will rust.

 

[2020FordRaptor]

Noticed rust build up today on my rear driver side rotor. No other rotors have build up. No visible leaks, pinched lines, etc. Has anyone else experience this issue?

Pics?

 

[mcfarlrm]

Maybe just that one got water on it. All rotors will rust.[/QUOTE
Just after it rained and yes, all rotors rust after a good rain. Drove it right after and noticed one had rust after the drive. Thinking Piston(s) are the issue but didn't know if this was a common issue or not. What I have noticed prior to this is it seems that after applying the e-brake and releasing that something seemed to stick when putting the vehicle into drive.

 

[mcfarlrm]

Pics?

No pics at this time but standard stuff here after a good rain and rotors rust and dissipate after a drive. It may be an intermittent issue since I drove again and rust is gone.

 

[2020FordRaptor]

No pics at this time but standard stuff here after a good rain and rotors rust and dissipate after a drive. It may be an intermittent issue since I drove again and rust is gone.

From the limited info, I’m guessing it’s normal and just because of the rains.