1994 E320 sedan brake caliper frozen rebuild or replace?

[Henry1]

I have repaired and replaced the calipers, pads, discs, and hoses, 18 short months ago. When I recently heard the scraping noise I thought what gives; it felt way too soon for this to happen. The other three are fine and have plenty of pad to go. It is my left rear caliper and since I did the brake job somewhat recently I wanted to identify the manufacture of the caliper. I looked and I see a Mercedes symbol and under that 61P or G1P and to the left of those two marks is a symbol or design I am uncertain of. I suppose it is safe to assume it is a Mercedes caliper. Okay, let me ask ... is it; does anyone know?

I have read the forum and note all of the votes against rebuilding a frozen caliper with just a few saying they have done so successfully. I have rebuilt a caliper once and I remember it had some challenging moments. I did complete it successfully. My problem is that I am on a very limited income so I have to cut costs whenever and wherever I can. So I am looking for some advice.

I don't know yet if both sides are frozen. I read about and like the suggestion of using hydraulic pressure to free up the frozen side. That is if only one side is frozen. I am thinking of using hydraulic pressure to make certain the unfrozen side is moving freely. Then leaving the unfrozen side in place and freeing up and removing the frozen side. After that removing the side I messed with first. Any ideas on what I am thinking of attempting?

I figure I will buy an ATE rebuild kit, I hope that will work on the caliper I have to work on. Will that work? By the way anyone have a caliper rebuild kit they decided not to use for my 94 E320? I am going to look at the parts section of the forum to see if there are any postings. I need to get a disc in all likelihood too.