My Aeromax has been off the road for a month or so, since one of the tail window broke...

Having recieved a new glass from MMC, I drove the car to my local body shop for fitting.

When I strated the car, the rear wheel caliper was stuck against the disc

The handbrake was off (I never use it)

I reveresed the car and heard a noisy clonk zhen the caliper freed up

When stopping the car at the body shop, which is half a mille from where I live, I noticed some liauid on the internal face one of the rear rim

Likely this is some brake fluid

Would this be a one off when the caliper unstucked or is it more likely that the seals have gone?

If that is the case, should I get both sides done?

Thanks for the advice