Textron Specialized Vehicles TRACKER LX6 EFI, Repair And Service Manual

Page: 122 / 168

B
104
Repair and Service Manual
BRAKES
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
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Figure 12 Periodic Brake Performance Test
NOTICE: Over time, a subtle loss of performance
may take place; therefore, it is important to estab-
lish the standard with a new vehicle.
Drive the vehicle at maximum speed on a flat, dry, clean,
paved surface (Figure 12). Quickly depress the brake
pedal to latch the parking brake at the line or marker in
the test area and remove foot from pedal. The vehicle
should stop aggressively. The wheel brakes may or may
not lock. Observe the vehicle stopping location or mea-
sure the vehicle stopping distance from the point at which
the brakes were latched. The vehicle should stop within
the “normal” range of stopping distances. If the vehicle
stops more than 4 ft. (1.2 m) beyond the acceptable stop-
ping distance or pulls to one side, the vehicle has failed
the test.
Repeat test two more times.
If the vehicle fails to pass two of three Periodic Brake Per-
formance Tests, perform the Aggressive Stop Test 10
times as described below, then repeat the Periodic Brake
Performance Test three more times (second set of three).
If the vehicle passes two of three Periodic Brake Perfor-
mance Tests, check that the clevis pins at the brake
levers are loose. If they are loose, return vehicle to ser-
vice. If they are tight, adjust free travel. “Adjusting Brake
Pedal Free Travel” on page M 14 Then repeat the Peri-
odic Brake Performance Tests. If vehicle fails, remove
from service and refer to ‘Wheel Brake Inspection’, to
evaluate the reason for failure.
Aggressive Stop Test
To prevent serious injury or death,
all brake tests must be done in a
safe location with regard for the
safety of all personnel.
Always conduct a visual inspection and evaluate
pedal travel before operating a vehicle to verify
some braking function is present.
The purpose of this test is to attempt to fully expand and
release the brake adjusters on a vehicle which has failed
the first set of Periodic Brake Performance Tests. It is
important that the technician/mechanic exercise care and
perform the test in a non-congested area with regard for
the safety of all personnel.
To perform an Aggressive Stop Test, equally load both
sides of the vehicle (See Figure 12) and apply maximum
force and travel to the service brake pedal while moving.
Do not latch the parking brake. Do this a total of 10 times
with the first few at slow speed. If brake function is ade-
quate or improves, increase speed for the remaining
tests. Before the end of the tests, both wheels should lock
at approximately the same time and slide straight.
NOTICE: The brake adjuster mechanism must
expand and release fully to function. Under light
usage this may not occur, even though the vehicle
stops acceptably. The adjuster functions most con-
sistently with aggressive braking.
Wheel Brake Inspection
Wear a dust mask and eye protec-
tion whenever working on wheel
brakes. Do not use pressurized air
to blow dust from brake assemblies. Replace both
Latch
Parking Brake
and Take Foot
Off Pedal
Line or Marker
Acceptable
Stopping
Distance
Normal Range of
Stopping Distance
Any vehicles that stop
more than 4 ft. (1.2 m)
beyond the Acceptable
Stopping Distance or
pulls to one side should
be removed from service
and inspected by a
qualified mechanic
Accelerate To
Maximum Speed
4 ft. (1.2 m)
Line or Marker
Dry, Level, Clean, Paved Surface