TSE T50 BWRC, Руководство пользователя, Страница: 68 / 129

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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 12
1 /
4
" Hydraulic Brakes
Forward self-adjust hydraulic brakes were introduced in March,
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 2002, the parking cable body
mounts to a support plate which is attached to the brake
mounting flange. 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 2002, a short cable is
Braking Systems - Hydraulic
Anchor Post
Retractor
Springs
Backing
Plate
Secondary
Shoe
Adjuster Spring
Adjuster Assembly
Primary Shoe
Hold Down
Spring
Actuating Pin
Hydraulic Wheel
Cylinder