Milnor 48040F7D, Installation And Service, Page: 57 / 135

Disk Brake Maintenance
PELLERIN MILNOR CORPORATION
1.1.
Examine the fluid in the reservoir.
—Change the hydraulic fluid if it smells, has
contamination, or has an unusual color. See Section 4 .
Note 3:
Brake fluid can become defective from heat in the brake system. Brake fluid absorbs water from
air. Water in the brake system causes corrosion.
If necessary, add new DOT 3 fluid to 0.25 inch (6.35 millimeters) from the top of the reservoir.
Follow the precautions on the container.
1.2.
Examine the rotor disk surface ( Figure 1 , item 5).
—Replace the disk if it is worn
or if it is not flat.
1.3.
Examine the brake pads ( Figure 2 , item 4).
—To do this, you will remove/replace the
calipers and bleed the hydraulic system. See Section 3 and Section 4 .
1. Remove power from the machine (see Notice P1).
2. Remove the bolts ( Figure 1 , item 9) that attach the caliper halves ( Figure 1 , item 7).
3. Remove the caliper halves.
4. Replace the pads as told in Section 2 if
• the pads make an unusual noise when you apply the brake
• if the rotor is worn or damaged
• if the pad thickness is less than 1/16 inches (2 mm) ( Figure 2 , item 14) above the
mounting screw ( Figure 2 , item 3). Always replace the two brake pads at the same time.
5. Put the caliper halves in their positions on the brake assembly. Tighten the mounting bolts to
30 foot-pounds (41 Newton-meters).
6. Bleed the hydraulic systems as told in Section 4.4 .
7. Supply electrical power to the machine.
1.4.
Examine the condition of all of the brake system.
1. Make sure that brake mounting components are tightly installed.
2. Make sure that fittings are tight. Make sure that there are no leaks.
2.
How to Do a Friction Pad Replacement
You must have the necessary replacement friction pads for your machine. Refer to the brake parts
document in your machine manual. You will find part numbers for components or overhaul/repair
kits. The overhaul/repair kit contains O-rings, pads, and other components.
1. Remove power from the machine (see Notice P1).
2. Remove the used fluid. See Section 4.3 .
3. Remove the two bolts that attach the caliper ( Figure 1 , item 9) and the two caliper halves
( Figure 1 , item 3) to get access to the friction pads. Do not disconnect the hydraulic line
( Figure 1 , item 6).
4. If there are leaks, see Section 3 “How to Do a Caliper Overhaul ” before you continue.
5. Replace each friction pad:
a. Remove the brass screw ( Figure 2 , item 3) that attaches the pad to the piston.
b. Attach the new pad to the piston. Tighten the screw.
c. Make sure that the screw head is fully in the recess in the pad.
6. Make sure that the connection o-rings are clean and in their positions ( Figure 2 , item 7).
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