Front passenger brake lock up

[SunTzuMD]

Need help in figuring out where to start. My 1990 4x4 V6 will lock up the passenger front brake fairly easily whenever I get on the brakes. It locks up well before anything else. Seems to be worse when wet.

Could this be brake fluid on the pads? I vaguely remember something similar happening on another vehicle long ago.

Truck has 200K and change on the odometer. Is driven only for errands / lumber / trash / brush etc.

 

[Sam Stewart]

Sounds more like the caliper is sticking or the 3-way has trash in it or something. Have you looked at the pads or calipers? I'd take the front brakes down and see if you can push the cylinder in on the caliper with a big set of channel locks. If it's extremely hard to push or doesn't move, there's your problem.

Edit: If the right front is locking up, the left front is the one that would likely be stuck, forcing the right to do all the braking.

 

[Bogo]

Edit: If the right front is locking up, the left front is the one that would likely be stuck, forcing the right to do all the braking.

yep...

 

[SunTzuMD]

Caliper's free, break lines replaced, still will pull hard right occasionally