F.
ROAD TEST
1.
Brake Performance
Inspection Procedures:
Repair (or note) if:
Out of Service if:
a.
Park Brake
Check for proper operation of park brake as
follows:
With vehicle stopped, apply park brake.
When engine torque is applied by
partially engaging clutch in second gear
(manual transmission) or by placing
transmission gear selector in drive
(automatic transmission) and speeding
up the engine to a fast idle
(approximately 1,200 R.P.M.’s), vehicle
should not move forward.
b.
Stopping Distance and Equalization
1)
Stopping distance
The following stopping distance
requirements should be met when
stopping the vehicle on a level, dry,
smooth, hard surface, free from loose
material, from a speed of 20 M.P.H.:
a)
?
Decelerometer reading (feet per
second per second) minimum of
14.
166
NOTE:
Buses equipped with Rear Diesel
Engine and Allison World Transmission
should be checked at 900 R.P.M.
Stopping distance is close to, but within,
acceptable limits (repair).
(Continued on Next Page)
Vehicle moves forward.
Distance to stop is greater than maximum
feet requirement, or decelerometer reading
is less than minimum reading requirement.
Supp.
03-1
F.
ROAD TEST
1.
Brake Performance
Inspection Procedures:
Repair (or note) if:
Out of Service if:
OR
b)
?
Stopping (at 20 M.P.H. from point
of brake pedal application)
maximum of 30 feet.
NOTE:
Use of either decelerometer or
stopping distance measurement is
acceptable.
Lockup of brakes is
acceptable, but not necessary.
The bus
shall not be rejected for failure to lock
brakes if it passes the stopping distance
and equalization requirements.
2)
Equalization
The stopping distance test should not
result in excessive brake pulling
(steering pulls sharply, and/or bus will
not stop within a lane 12 feet wide).
NOTE:
?
Remove hands from steering
wheel while conducting this
test.
167
Bus pulls but stops within a lane 12 feet wide
(repair).
Bus pulls sharply and will not stop within a
lane 12 feet wide.
Supp.
03-1
F.
ROAD TEST
2.
Engine, Transmission, Driveline
Inspection Procedures:
Repair (or note) if:
Out of Service if:
a.
Engine Performance & Governor
Check for starting, proper idle, lack of
stalling, missing or hesitation, performance
when accelerating, and shutdown of engine.
b.
Shifting
1)
Automatic Transmission
Check operation of shifter and
transmission.
168
Rough or low idle of engine (repair).
(Continued on Next Page)
Engine will not start or is difficult to start.
€
Engine will not shut down.
€
Engine stalls.
€
There is hesitation upon acceleration.
€
Engine stalls or is misfiring.
€
Acceleration performance is poor.
€
There is excessively rough up and down
shifting or hard shifts.
Transmission will not shift up and down
through gear range.
Transmission is slipping or noisy.
Shift points are not within manufacturer’s
specifications.
Supp.
03-1
F.
ROAD TEST
2.
Engine, Transmission, Driveline
Inspection Procedures:
Repair (or note) if:
Out of Service if:
2)
Manual Transmission
Check operation of clutch, shifting, and
transmission.
169
Clutch engagement is rough or noisy
(repair).
Transmission is hard to shift (repair).
Clutch pedal travel has less than one inch
free play (repair).
Clutch does not engage or is slipping.
Transmission jumps out of gear.
Supp.
03-1
F.
ROAD TEST
3.
Steering & Handling
Inspection Procedures:
Repair (or note) if:
Out of Service if:
a.
Free Play
Check for free play in steering.
b.
Power Assist
Check power steering assist (effort) when
turning to the left or right.
c.
Steering Column
Check up and down movement of steering
column.
d.
Tracking
Check vehicle steering recovery from left
and right turns, wander on rough or crowned
roads, and tracking when driving straight
ahead.
170
There is poor recovery on turns (repair).
(Continued on Next Page)
There is excessive wandering or shimmy due
to free play in steering.
There is no power assist.
Bus is hard to turn to the left or right.
There is jerking in the steering wheel when
turning to the left or right.
There is a significant difference in left and
right turning radius of bus.
Up and down movement is greater than one
inch.
There is no recovery on turns.
Supp.
03-1
F.
ROAD TEST
3.
Steering & Handling
Inspection Procedures:
Repair (or note) if:
Out of Service if:
There is pulling in the steering (repair).
?
Bus does not track properly (front and rear
wheels are not in-line).
Bus wanders and requires excessive
steering correction or effort to maintain
straight-ahead driving.
171
€
Supp.
03-1