Sticking left rear caliper - '88 300SEL

[86560SEL]

Hi all,

Since I got my old '88 300SEL back from my mother when she bought a brand new car, I haven't driven it much and have really neglected her. Too many cars, not enough time. Bad excuse I know and need to do better.

Anyway, it has been rarely driven since June of 2017. I have only taken it out a couple of times since and it has not been on the road since April of this year, but I have went out and started the engine regularly (at least once a week) and let it run for about 15-20 minutes per time. I wasn't moving it around much before and even in April I noticed it seemed to be something was holding it back, then I found out that the brakes seemed to be sticking a little and it seems to be coming from the left rear brake. I did not park the car and leave it with the emergency brake on, so I do not think it is that. Back in 2009, we had to replace the rear calipers because one was sticking, but then it was not due to not being driven.

I am wondering if overtime, when I start driving this again (I am going to drive at least once every 1-2 weeks once I see if the new relay I installed is going to stop the random stalling issue) if it will start to loosen up. It was working fine before we stopped driving it regularly.

I have 6 cars and driving the use them all regularly is a challenge. I really need to reduce the number of the fleet. lol. It is not good to leave a car setting idle.