PREVOST X3-45 COMMUTER User Manual

SECTION 12: BRAKE AND AIR SYSTEM
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual First release Oct 2020
49
Air Supply Tank Leakage
CONDITION: Full pressure, engine stopped,
parking brake applied
1. Allow at least 1 minute for pressure to
stabilize.
2. Stop engine, then check air pressure gauge
for 2 minutes. Note any pressure drop.
3. Pressure should not drop by more than 3
psi (20 kPa) per minute.
For common corrections, refer to the following
check list:
Excessive air loss:
• With the primary air system at normal
operating pressure 122-140 psi (841- 965
kPa), coat all air line connections and
pneumatic components with a water and
soap solution. Bubbles will indicate an air
leak, and none should be permissible. Repair
or replace defective parts.
• Listen for leaks and correct as required.
• Redo test to check all items repaired or
replaced.
Brake System Air Leakage
CONDITION: Full pressure, engine stopped,
parking brake released.
1. Apply service (foot) brakes, allow at least 1
minute for pressure to stabilize.
2. Hold down foot valve for 1 minute while
observing air pressure gauge on the
dashboard.
3. Pressure drop should not be more than 3
psi (20 kPa) per minute.
For common corrections, refer to the following
check list.
Excessive leakage on brake service side:
• With the primary air system at normal
operating pressure 122-140 psi (841- 965
kPa) and foot brake applied, coat all air line
connections and brake pneumatic
components with a water and soap solution.
Bubbles will indicate an air leak, and none
should be permissible. Repair or replace
defective parts.
• Listen for leaks and correct as required.
• Redo test to check all items repaired or
replaced.

PREVOST X3-45 COMMUTER Specifications

General

Engine	Volvo D13
Transmission	Allison B500
Fuel Type	Diesel
Length	45 ft (13.7 m)
Width	102 in (2.6 m)
Horsepower	500 hp
GVWR	54, 000 lbs
Height	141 in