How to Install Drilled & Slotted Rotors

Automobiles that are manufactured with disk brakes use a rotor and caliper system that stops the car with friction. This hydraulically-actuated friction can cause a large amount of heat to build up on the rotors and pads, which can lead to failure of the braking system. Installing rotors with drilled holes and long slots can lower the temperature, but the larger size usually requires the replacement of the caliper. The average backyard mechanic can install a set of slotted rotors in about an hour.

Instructions

1

Raise the end of the vehicle with the floor jack, and place it on the jack stands. Position the stand heads onto the frame rails, not the suspension. Lift the vehicle so that the wheels are off the ground at the axle where the brakes are to be changed.

2

Remove the wheels by turning the lug nuts in a counter-clockwise direction, then pulling the wheels from the hubs. Set the wheels aside from the work area.

3

Remove the line bolts that connect the brake lines to the calipers by turning the line nuts counter-clockwise with the line wrench. Allow the brake fluid to drain into the drain pan, or cap the line to prevent dust and debris from entering. Remove the calipers by turning their twin rear mount bolts counter-clockwise, then slide the calipers off of the rotors.

4

Remove the old rotor by pulling it free of the hub, or turn the hub nut counter-clockwise. Set the old rotor aside.

5

Press the new slotted rotor onto the hub, and lock down the hub nut if applicable.

6

Replace the caliper (and pads) by turning the line nuts clockwise, then slide the caliper onto the rotor. Tighten the rear mount bolts in a clockwise direction.

7

Purge the braking system with fresh fluid by turning the bleeder nipple counter-clockwise while continuously pouring more fluid into the master cylinder with the brake pedal depressed. This could take more than one person. Collect spent fluid in the drain pan. When the fluid coming out is golden and without air bubbles, close the nipple by turning it clockwise. Repeat on the opposite side.

8

Replace the wheels by turning the lug nuts clockwise in an alternating pattern.

9

Lower the vehicle from the jack stands with the floor jack.