Numerous times now after my truck has been sitting, For as little as a day I start up and when Im Going forward and Hit the brake One side grabs faster and it pulls to the left. Its only the first Pump. Sometimes its bad other times not as bad. Does it sound like a caliper to anyone out there and if its always pulling to the left when this happens, is it the left caliper. Thanks in advance

 

Possibly one of the calipers hanging up on the pins... or it could be rust on the rotors. After the first application the rust is rubbed off and all is good. It's possibly one of the rotors is more rust resistant than the other, hence pulling to the left every time.

I'd remove the calipers and make sure the pistons move freely and that the slides aren't all froze up and all (lubricate them while you have it apart)... compare rust build up from one rotor to the other...

Another possibility could be a leaking axle seal or wheel cylinder on the rear... may be coating the shoes on one side a bit with fluid...

Also possibly a hydraulic problem, but when this happens it usually happens every stop, not just the first time.

Good luck.

 

Brakes and Rotors are fairly new...Has been an ongoing problem

 

Either the sliders or the caliper is seizing up like MRGinstl said. Pull it apart and check it out.

 

If the brake is locking up in the front you usually feel it as a shutter or grabbing and jerking on that side. If it is freezing usually the inner pad will be worn all the way down while the outer pad looks almost new.

Been a few years since I worked on a 2000 DRW, but, you should have caliper pins. It is next to impossible to tighten the bolts that hard, the design is not prone to hanging up, and it is next to impossible to tighten the lugnuts enough to warp the rotor.

That leaves the rear brakes, as someone mentioned a leaking axle seal will coat the brake shoes (on the opposite of the pulling). If you have a bad brake cyl. the leak would show up in the mstr cyl and be low.

The best check is before you drive the vehicle, put each side up in the air and spin the wheel. Then using something to push the brake pedal lightly just enough to make the stop lamps light, I use a CLUB between the pedal and seat, lift each wheel on a floor jack and see if the wheel spins or not.