3-56
Condition
Vehicle does not move
Brakes dragging
Damaged hydraulic system.
1. More than 1.4
bar
(20
psi
) pressure
applied when brakes released.
2. Damaged piston return spring
assembly.
3. Piston not returning.
4. Wrong cooling and/or actuation
fluid used.
5. Parking brake not adjusted prope-
rly.
Repair hydraulic system.
1. Repair hydraulic system so pressure is less
than 1.4
bar
(20
psi
) when brakes released and
while machine is operating in any mode.
2. Repair or replace piston return spring
assembly.
3. Check piston seals for swelling or damage.
Replace as necessary.
4. Check piston seals for swelling or damage.
Purge system and use specified fluid.
5. Adjust parking brake lever as described in
assembly of this manual.
Possible cause Correction
BRAKE DOES NOT RELEASE
5)
Condition
Noticeable change or
decrease in stopping
performance.
Brake does not fully
apply.
Brakes fell spongy/soft.
1. Inadequate actuation fluid supply
to brakes.
2. Inadequate pressure to apply
brakes.
3. Worn or damaged discs.
4. Overheated seals and/or discs.
5. Dirty or contaminated cooling
fluid.
1. Empty fluid reservoir.
2. Damaged hydraulic system.
3. Leakage of brake actuation fluid.
Brakes or brake system not properly
bled.
1. Replenish fluid in brake system. Check for
leakage and correct cause.
2. Check brakes apply system. Check for
leakage in brake system or brakes, and
correct cause.
3. Inspect and replace discs if necessary.
※
As disc wear occurs, make sure brake
system can supply adequate fluid to fully
apply brakes.
4. Inspect and replace discs and seals if
necessary.
5. Drain and flush cooling fluid from brakes and
entire brake system. Replace with approved
fluid. In some cases, it may necessary to
replace discs. Clean or replace filter.
1. Fill reservoir to correct level with specified
fluid.
2. Repair hydraulic system.
3. Refer to "Brake leaks actuation fluid" in this
section.
Bleed brakes and brake system.
P
Possible cause Correction
BRAKING PERFORMANCE
6)
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