11-42 Pretrip inspection and maintenance
1. While driving slowly, make sure that the steering
wheel does not shake and the vehicle does not
pull to one side. The wheel should turn easily,
without excessive operating resistance, and
return smoothly to the neutral position.
2. If any problem is found, call an authorized Ster-
ling service facility for inspection.
The service brakes are critical to vehicle safety. If
an inspection reveals any problem, contact an
authorized Sterling service facility to solve the prob-
lem.
1 Brake pedal free play
1.1 <COE 40, 45: vacuum pressure booster>
1. Shut down the engine.
2. Set the parking brake and chock the rear tires.
3. On vehicles with a manual transmission, make
sure that the shift lever is in neutral.
On vehicles with an automatic transmission,
make sure that the shift selector is in “P” (park).
4. Pump the brake pedal several times to release
all the vacuum from the brake system (zero vac-
uum).
5. Press down with one finger on the center of the
pedal pad to the point where resistance is felt.
6. Measure the amount of brake pedal movement
between these two points. This is the brake
pedal free play. If the free play is not within
these limits, contact an authorized Sterling ser-
vice facility.
1.2 <COE 50: hydraulic brake booster>
1. Shut down the engine.
2. Set the parking brake and chock the rear tires.
3. On vehicles with a manual transmission, make
sure that the shift lever is in neutral.
On vehicles with an automatic transmission,
make sure that the shift selector is in “P” (park).
4. Press down with one finger on the center of the
pedal pad to the point where resistance is felt
(the electric motor will come on).
5. Measure the amount of brake pedal movement
between these two points. This is the brake
pedal free play. If the free play is not within the
limits given in the table above, contact an autho-
rized Sterling service facility.
Service brake checking
Inspection interval Daily pretrip inspection
Brake pedal free play
(at center of pedal pad)
0.004 to 0.118 in
(0.1 to 3.0 mm)
Z09288
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