releases the brakes through the action of the master
Q2-18. Brake linings that are riveted to the brake
shoe should be replaced if worn to less than
what percent of their original thickness?
The inspection and maintenance procedures
described earlier for hydraulic and pneumatic brake
systems apply as well to the hydraulic and pneumatic
portions of the air-over-hydraulic system. You should
consult the appropriate technical manual for required
maintenance of the master cylinder assembly.
Q2-19. What method of bleeding a brake system
employs a bleeder tank?
Q2-15. On a drum type brake system, which of the
following malfunctions, if any, will occur if
The conventional method
the anchor pin is too near the center of the
The pressure method
The universal method
The manual method
1. The shoe will not firmly press against the
drum when brakes are applied
2. The shoe will automatically lock when
brakes are initially applied
3. The brake pedal will go to the floor when
LEARNING OBJECTIVE: Identify the
brakes are applied
components of a basic power train.
Q2-16. A disc brake assembly consists of a metal disc
Aviation support equipment that is powered and
and which of the following components?
mobile must have a method of transferring the power
from the engine to the wheels. This is the basic power
A wheel cylinder
train, which consists of the transmission, propeller
An actuating cylinder
shaft, universal joints, differential, and axles. Figure
A brake drum
2-47 shows one type of power train.
Q2-17. What is the main advantage of bonding a
Consider the power train required in a four-wheel
brake pad to the brake shoe?
(rear) drive vehicle. In the process of transmitting
power from the engine to the driving wheels, the power
1. Bonding reduces manufacturing costs
train provides the following:
2. Bonding allows for the use of thicker pads
A means of engaging the engine to the drive
to be used
3. Bonding reduces the amount to galvanic
Several different gear ratios between the engine
4. Bonding allows the pad to be worn thin
without scarring the drum
and the drive wheels
Figure 2-47.--Power train.