Morbark 1415 - Hydraulic Parking Brake Option; Self-Adjusting Mechanism for 12 1;4 Brakes

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Braking Systems - Hydraulic
Another variation is called a “free backing” brake which is commonly used
on trailers with a surge hitch system. When backing with a surge brake hitch,
normal brakes are applied through the surge mechanism and if there is more
brake force on the trailer than the tow vehicle can override, no backing is
possible. The free
backing brake was
developed to allow
backing in this
application. This brake
has a primary shoe on
a pivot which allows
normal application in
the forward direction,
but allows the primary
shoe to rotate away
from the drum surface
when backing.
Self Adjusting Mechanism
for 12¼" Hydraulic Brakes
Forward self-adjust hydraulic brakes were introduced in March of 1997. This
feature adjusts the brakes on both forward and reverse stops. Brake adjustment
occurs only when lining wear results in enough gap between the shoes and
the drum surface. This added clearance will allow the adjuster mechanism to
rotate the screw assembly at the bottom of the brake. That action expands the
distance between the shoes and thus closes the gap to the drum surface.
Hydraulic Parking Brake Option
(Not available on all sizes)
The parking feature on Dexter hydraulic brakes is cable operated. On the 10"
and 12" brakes, the parking cable body is mounted to the brake backing plate.
The cable end is attached to the internal parking brake lever to actuate the
brake. On Dexter 12 1/4" brakes manufactured before February of 2002, the
parking cable body mounts to a support plate which is attached to the brake
mounting ange. The cable end is routed through the dust shield and the
brake spider, to attach to the internal parking brake lever. For 12 1/4" brakes
produced after February of 2002, a short cable is installed directly into the
backing plate to provide a convenient means for the trailer manufacturer to
attach an appropriate operating system.
Anchor Post
Retractor
Springs
Backing
Plate
Secondary
Shoe
Adjuster Spring
Adjuster Assembly
Primary Shoe
Hold Down
Spring
Actuating Pin
Hydraulic Wheel
Cylinder