H-11 The Brake Is Not Released Or Is Dragged - Komatsu WA250-6 Shop Manual

500 Troubleshooting of hydraulic and mechanical system (H-mode)

H-11 The brake is not released or is dragged

H-11 The brake is not released or is dragged
Ask the operator about the following:
Has the brake pedal returned completely?
q
Is the parking brake released completely?
q
Check abnormality
Abnormal heat of brake.
q
Does the machine travel smoothly inertia on a level ground?
q
No.
Diagnosis
1 The brake pedal is released, but the brake is still applied
When the brake pedal is released, oil is drained from the air bleeder, the circuit oil pressure
2
drops and the brake is released
When the four wheels are jacked up, the axle is placed on a table, the engine is stopped, the
3
parking brake is released and the tires are rotated by hand but a specific tire hardly rotates
WA250, 250PZ-6
SEN03849-00
Cause
a b c d
E E E E
Remedy
X X X X
Q Q Q Q
Q Q
Q Q Q
17
40-500
1