MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
MT-7-420
9/02
25
3.
Air in system
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 trav-
eling under normal pressure. In either case,
the system should be bled and refilled.
4.
Lack of fluid in reservoir
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
If vent hole in reservoir plug becomes
stopped, there is a possibility that a partial va-
cuum 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
Bleed brakes.
7.
Master cylinder cup or “O” ring
wear
Replace brake cylinder cups and “O” rings.
8.
Wheel cylinder leakage.
Replace wheel cylinder seals.
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.
Probable Cause
Corrective Action
1.
Foreign matter in system
If dirt is found in the system, the master cylin-
der and brake assemblies must be dismantled
and parts cleaned with alcohol and reinstalled.
Flush system and install new brake fluid.
2.
Binding of brake piston
Dust or dirt mixing with brake fluid at the brake
may become gummy and cause sticking of the
brake piston. Remove parts and clean and fill
system with new fluid.
3.
Use of improper fluid
Improper fluid may destroy the seal and pack-
ings. Use only the recommended hydraulic
fluid.
