[dnwong]

Brake locked up and turned red. Caliper piston failed. I ended up replacing the rotor, caliper, pads and new brake hose. Drives ok for a week or so and then the left front brake locks up again. Thinking it was either the master cylinder or abs. I pulled the fuse on abs (red jcase fuse #9) and the car has not had a brake problem for a few weeks. I put the fuse back in and again experiencing the brake locking up on the left front wheel. No abs lights (except when I had the fuse out).
Tone ring seem to be tight. The wheel would lock up with the abs fuse back in and when I drive over some rough roads or gravel (seems that way) and would stay locked up until the car cools down (like overnight).
Any thoughts?

 

[Trilogy]

Bad wheel sensor can cause the ABS unit to apply that brake thinking wheel is spinning. Normally this would cause the ABS/Traction lights on the dash to come on. The ABS module could also be bad although less common.
I normally dont throw parts at a fix but you can get a new ABS sensor for that wheel at about $15 online and worth the try.
I had to replace both of mine on front.