Ok i have a 95 Montero LS i have been replacing my rear brake pads on average of once every three weeks. Now i replaced my rear caliper's with some used ones i found at a local yard 6 month's ago and still the same problem where should i check now or what should i replace?
thanks
lee

Turn the rotors(meaning have them machined smooth), and replace pads with NEW ceramic ones. Check your e-brake and make sure it is not partially engaged. <img src="/forums/images/graemlins/kewl.gif" alt="" />

Are your brakes dragging? Jack up the rear wheels, put the transmission in neutral, and see if the rear wheels turn freely. If they turn with minimal effort, then it's probably your master cylinder or the load sensing proportioning valve. Check the valve first, it's located on the body above the rear axle pumpkin. Make sure that the spring that attaches from the lever on the valve to the bracket on the axle is intact. If that spring is broken or not attached, the lspv will think that you are carrying a heavy load & send more brake fluid pressure to the rear brakes, causing them to wear out faster. I would also take off the spring (if it's there) and manually move the lever on the valve to make sure it's not stuck in one position. If the proportioning valve seems to be OK, then chances are it's your master cylinder passing fluid internally. I would also try bleeding your brakes before replacing anything, because it's cheap to do and you might just have some air in the system that's causing your problem.

Mine wear out fast too. I figured it was just part of the cost of admission to the rear disk club.

Just to add to what others have posted. I found that when the caliper slides are dismantled and cleaned/regreased, you need to burp the air from the slides after reassembly.Press the caliper sides together and peel back the rubber seal - air should come out. The first time I did slide service to my rear brakes I did not get 2 miles before realizing my brakes were dragging. After that I get great mileage from all my brakes.

i was actually thinking this may be it so i'll try this first and in the mean time i'll check out the spring.
thanks for all the input
lee