Brake System Maintenance - Landoll 334C Operator's Manual

4-9 BRAKE SYSTEM MAINTENANCE

Figure 4-10 Drain Cock Locations
CAUTION
USE GREAT CARE IF WHEELS OR
BRAKE DRUMS MUST BE HANDLED.
THEY MAY BE VERY HOT AND CAN
CAUSE INJURY.
4-9.1 General
a. Check air hoses for chafing, bends, kinks, or
damaged fittings. Replace defective hoses.
b. Check the brake system for loose, missing,
deformed, or corroded fasteners. Replace
and tighten defective hardware.
c. Check brake linings for excessive wear or
distortion.
d. Drain air reservoir daily. A drain cock on the
bottom of each air reservoir vents the tank to
drain collected water and oil. If held open, air
pressure in the tanks is relieved, causing the
emergency or parking brakes to be applied
(See Figure 4-10).
WARNING
THE SPRING BRAKE CHAMBER EM-
P LO Y S A S P R I N G W I T H HI GH
FORCES. SERVICE SHOULD NOT BE
ATTEMPTED. SERIOUS INJURY OR
DEATH MAY RESULT.
4-9.2 Spring Air Brake
Check for faulty units. Check the condensation
holes on the underside of the brake chambers to
make sure they are open. The spring brake has
two brake chambers, a service chamber and an
emergency chamber or spring chamber (See Fig-
ure -10). Service brake chambers should be disas-
sembled and cleaned at 50,000 miles or yearly.
The diaphragm and any marginal parts should be
replaced. When replacing the service diaphragm,
replace the corresponding parts for the other
chamber on the same axle (to aid in event brake
application and release). Examine yoke pin for
wear and replace as necessary. The spring cham-
ber should not be serviced. Replace entire unit
(both service and spring chamber) if spring cham-
ber becomes faulty.
4-13