MERITOR-TP-9853
MERITOR WEDGE BRAKES
MAINTENANCE MANUAL NO. 4R
FEBRUARY 1995
MERITOR-TP-9853 - Page 30 of 32
Section 7
Visual Inspection of the Brake System
26
Section 7
Visual Inspection of the Brake System
For safe operating conditions and longer
component life, make these visual inspections
before the vehicle is put into service:
1. Check the complete air system for worn hoses
and connectors. With air pressure at 100 psi,
brakes released and engine off, loss of tractor
air pressure must not exceed two psi a minute.
Total tractor and trailer loss must not exceed
three psi per minute.
2. Check to see that the air compressor drive belt
is tight. Air system pressure must rise to
approximately 100 psi in two minutes.
3. The governor must be checked and set to the
specifications supplied by the vehicle
manufacturer.
4. Both the tractor and trailer air systems must
match the specifications supplied by the
vehicle manufacturer.
5. Both wheel ends of each axle must have the
same linings and drums. All four wheel ends
of tandem axles must also have the same
linings and drums. The front axle brakes do
not have to be the same as the rear driving
axle brakes.
Figure 7.1.
6. Friction material requirements for brake
systems can vary from vehicle to vehicle.
Always follow the vehicle manufacturer’s
specifications to ensure that the correct lining
is used.
7. Make sure that the return springs completely
retract the shoes when the brakes are
released. Replace the return springs each time
the brakes are relined. Make sure that the
spring brakes retract completely when they
are released.
Figure 7.1
TANDEM AXLES
FRONT AXLE
Both wheel ends of each axle
must have identical drums.
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