Toro 500 EFI Service Manual page 168

2. Press the piston into the caliper housing using hand
pressure only. Completely seat the piston; then wipe
off any excessive brake fluid.
3. Apply high-temperature silicone grease (supplied
with the O-ring kit) to the inside of the caliper holder
bores and O-rings; then install the four O-rings into
the caliper.
166
4. Install the caliper onto the caliper holder making sure
the caliper and holder are correctly oriented.

NOTE: It is very important to apply silicone grease
to the O-rings and caliper bores prior to assembly.
PR717A
5. Making sure brake fluid does not contact the brake
pads, compress the caliper holder toward the caliper and
install the inner brake pad; then install the outer pad.
If brake pads become contaminated with brake fluid, they
must be thoroughly cleaned with brake cleaning solvent
or replaced with new pads. Failure to do so will result in
reduced braking and premature brake pad failure.
PR711A
PR712
6. Place the brake caliper assembly into position and
secure with new "patch-lock" cap screws. Tighten
the caliper to 20 ft-lb.
7. Place a new crush washer on each side of the brake hose
PR719C
fitting and install it on the caliper. Tighten to 20 ft-lb.
CAUTION
PR239C
PR238
PR239