Inspection of the Bendix Hydro-Max® Brake System
wv mm 42.01.000
Note: If possible, remove both caps when filling the reservoir. If only one cap can be removed, allow ample time for the reservoir to fill.
- Check the fluid level in the hydraulic brake fluid reservoir.
If needed, fill the reservoir up to the ridge that surrounds the reservoir.
See Fig.. Use only heavy-duty brake fluid, DOT 3.
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Open caps and check fluid level.
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Fill to this level.
Fig. 1, Hydraulic Brake Fluid Reservoir
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- Check all hydraulic lines and fittings for damage, leakage,
or looseness.Replace damaged or leaking components, and tighten loose fittings.
- Check the brake module for leaks. If leaks are found, repair or replace the brake module. See of the Walk-In Van Chassis Workshop Manual for replacement instructions, or take the vehicle to an authorized Freightliner dealer.
- Check the electrical connections and harnesses. Make sure the connectors are fully seated and the harnesses are not chafed or cut. Repair or replace any damaged harness. Disconnect any loose connectors and inspect the terminals for corrosion. If corrosion is present, replace the terminals. If corrosion is not present, reconnect the connector.
- Check the operation of the Hydro-Max brake booster, as
follows.
- With the ignition off, depress the brake pedal; listen for the back-up motor to engage. The operator should feel the pedal force relieve and the pedal should depress easily.
- With the ignition on, engine running, and park brake released; operator checks that the BRAKE warning indicator is not on. This is a dual indicator, and it indicates that the park brake is set, and it warns if there is a hydro-max failure condition other than loss of back-up motor power.
- Check the fuse for the hydraulic brake booster pump, as follows.
Note: