S-10 Brakes

[Maximum Overdrive]

Have question on a 1986 S-10 4x4.  Whenever it rains the rear brakes will lock up when applied.  This only happens when it has rained and the only way to get it to quit doing it is to spin the tires a bit.  Anyone know why they would lock up like this only when it rains?

[Guest Friz]

I have a similar thing on my truck. Whenever the brakes are wet, they are real "grabby" until they dry out. This is when I first get in on a wet day or drive slow through a lot of water. I've heard others complain about the same thing. It isn't really a problem, though. When I am leaving home, I just ride the brake for about 100 yards from my house(speed limit is 15mph) and it's done.

[Maximum Overdrive]

I usually just spin the tires a little(short burnout) and they go back to normal.  Was just wondering if it was a part going bad as i have had it quite a while and it just started doing it.