They are connected through a linkage to an equalizer
lever (fig. 7-27) rod assembly, and cables connected
to the parking/emergency brake mechanism within the
drums/discs (fig. 7-26) at the rear wheels.
Several types of parking/emergency brakes are
manufactured for construction equipment, such as the
external contracting, the drum, and the disc types (fig.
7-28). These are drive line brakes common to heavy
construction equipment. They are usually mounted on
the output shaft of the transmission or transfer case
directly in the drive line.
Figure 7-27.Equalizer linkage.
Theoretically, this type of system is preferred for
heavy equipment because the braking force is
multiplied through the drive line by the final drive
ratio. Also, braking action is equalized perfectly
through the differential. There are some drawbacks to
this system, howeversevere strain is placed on the
transmission system, and also the vehicle may move
when being lifted since the differential is not locked
Figure 7-28.Examples of drive line parking/emergency brakes, transmission mounted.