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MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
M-4-180V
25
Rev. A
4/13/16
MAINTENANCE HINTS ON HYDRAULIC BRAKES:
Excessive pedal travel:
Probable cause
Corrective Action
1.
Normal wear of brake pad at wheel
1.
If pad is worn thin, replace with new pad.
2.
Leak in system
2.
Inspect all attachments and fittings in brake
system.
3.
Air in system
3.
A springy, rubber action of the pedal indicates
air in the system. An excessive amount of air
in system will allow the pedal to continue
traveling under normal pressure. In either
case, the system should be filled and bled.
4.
Lack of fluid in reservoir
4.
Air will enter system if the reservoir runs dry.
Inspect at regular intervals and keep reservoir
full at all times.
5.
Vent plug stopped up
5.
If vent hole in reservoir plug becomes stopped,
there is a possibility that a partial vacuum will
be created in the system which will interrupt the
fluid flow in the system. Clear vent hole.
6.
Improper bleeding - air mixed with
fluid
6.
Bleed brakes.
7.
Master cylinder cup or “O” ring wear 7.
Replace brake cylinder cups and “O” rings.
DRAGGING BRAKES:
NOTE: These disc brakes have no spring return of the pads and thus will always drag slightly.
Do not be concerned unless this drag is noticeable while taxiing.
6.
Improper bleeding - air mixed with
fluid
6.
Bleed brakes.
Probable Cause
Corrective Action
1.
Foreign matter in system
1.
If dirt is found in the system, the master
cylinder and brake assemblies must be
dismantled and parts cleaned with alcohol and
reinstalled. Flush system and install new brake
fluid.