Check your idler arm...

If the bushings in it are worn out, the arm can pull downward when braking, allowing the right wheel to turn right. You may also notice a quick side-to-side alternating pull when in 4WD.

"A young man who does not have what it takes to perform military service is not likely to have what it takes to make a living." - John F. Kennedy

Proud owner of an 88 Montero (with a blown engine).