Disk Brake Maintenance
PELLERIN MILNOR CORPORATION
You must have the necessary kit for the overhaul of your machine. Refer to the brake parts
document in your machine's manual.
1. Remove power from the machine (see Notice P1).
2. Get access to the caliper halves (see Section 2).
3. Do an overhaul on each caliper:
a. Remove and discard the connection O-rings (Figure 2, item 7) on the caliper bodies.
b. Apply compressed air to the fitting for the hydraulic inlets (see Figure 2, item 8) to push
the pistons out.
c. Replace the piston O-rings (Figure 2, item 6).
d. Put the pistons in the caliper body. Carefully tap the pistons with a wood or rubber
hammer to install it.
e. Replace the connection O-rings. (Figure 2, item 7)
f. Replace the friction pads (see Section 2).
4. Replace the caliper halves as specified in Section 2.
5. Bleed the brake circuit (see Section 4).
6. Supply electrical power to the machine.
4.
How to Change Hydraulic Fluid and Remove (Bleed) Air from the
Brake Circuit
4.1.
Risks and Precautions
WARNING 3 : Risk of injury —Machine power must be on for these procedures.
• Stay away from operating mechanisms.
CAUTION 4 : Risk of injury and damage —This procedure releases pressurized brake
fluid.
• Keep brake fluid out of your eyes and mouth. Wear eye protection.
• Follow procedures carefully to prevent damage to the face of the disk or the pistons.
CAUTION 5 : Risk of malfunction . —Air in hydraulic fluid will compress. Compressed
air in the brake line will cause brake malfunctions.
• Remove (bleed) air from the brake circuit before you operate the machine.
4.2.
Requirements —These personnel and items are necessary for this procedure:
• two technicians
• an 8-ounce container of new brake fluid
• Alternative procedures to remove air and used brake fluid:
» a suction pump (faster procedure) (see Figure 3)
» with pressure in the hydraulic cylinder and gravity (see Figure 4)
The Vacula suction pump can do the work more quickly than by gravity and pressure in the
hydraulic cylinder. It is also cleaner because all of the hydraulic fluid goes into the container
supplied. It helps you not spill the hydraulic fluid.
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