Right rear wheel locks up when wet out and brakes are applied

[JJs 88 Wrangler]

Hello All,
For some reason my right rear wheel locks up when it is raining/snowing out when I apply the brakes. Brakes have been bled, pads are good and the wheel cylinder is fairly new. The adjuster is all the way in otherwise I cannot get the drum on. When it is dry out, the brakes work fine for an 88 vehicle. Any help or suggestions are greatly appreciated!

Thank You,
JJ

 

[JPNinPA]

I had a similar issue on a F150 front disk brakes. It turned out to be a quarter sized dot of soft metal that rusted overnight. First application of the brake locked them up. After the first time all was fine. I suggest looking at the drum where the pad grabs and make sure it doesn't look rusty.

Also are you sure you put the pads on in the correct direction? Backwards they will bind and grab really hard until the pads break off.