You need to jack up the car and remove the wheel, make sure you use good jack stands to support the weight of the van. Next use a c-clamp from the outside pad to the back of the caliper and compress the caliper.Then remove the lower caliper bolt and swing the caliper upwards away from the rotor. replace the pads and reinsert the caliper and bolt. Make sure before moving the car you pump the brake pedal until firm. Then you need to Burnish the new braking surface after the Brake Pads have been replaced.
Burnish the new braking surface by making 20 stops from 30 mph. Use medium to firm pressure on the brake pedal. Do not overheat the brakes.

Need to change brake pads?