I have a 1996 dodge ram my brakes hop when I have to stop fast

they should be self adjusting push the parking break in a far as possible then release. do this about 10 times it should tighten up.

Have you adjusted the braking sensitivity on the controller? Usually a slider on the front of it.

Try bleeding the brakes. But, it sounds like you have a fluid leak. Check all four wheels for brake fluid leaking.
Check frame for wet spots.
chcke that the Master Cylinder is full.

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We just had the same problem with our 99 2500 Turbo Diesel Ram. The problem ended up being the factory trailer cord recepticle near the hitch. When we unplugged the harness from the back side of the recepticle we found that the brake terminals had gotten hot and burned out. We replaced the recepticle (about $30 from Dodge) and our problem was solved.

It sounds like you have a bad mastercylinder cause when you panic brake it doesn't have time to bleed through the valve in the cylinder but under normal braking your foot is on pedal longer in turn giving the fluid time to bypass the valve in the mastercylinder in turn the pedal going to the floor.

replaced the IPM (the fuse box) it was shorted

Probably becuase there is not enough brake fluid in the system.
check your brake fluid level.

Thee ABS modulator is faulty.

Straight forward job. Remove wheels, remove 2 caliper bolts per wheel, check bolts,and bushings for wear/corrosion and lubricate, remove calipers, remove brake pads, push caliper pistons into calipers, replace anti-rattle clips, put new pads in, put caliper and bolts in, put wheels on. Start truck and press brake pedal several times to take up slack and you're done.

There should just be two bolts that hold the caliper to the caliper bracket. Just unbolt them an pry off the caliper with a screwdriver.