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PAGE 56 — DCA-800SSK (STD) — OPERATION AND PARTS MANUAL — REV. #4 (06/03/10)
Figure 76. Hydraulic Brake Components
Brakes
Trailer brakes should be inspected the
first 200 miles
of
operation. This will allow the brake shoes and drums to seat
properly. After the first 200 mile interval, inspect the brakes
every 3,000 miles
. If driving over rough terrain, inspect the
brakes more frequently.
Air Brake System
Air brakes use compressed air to make the brakes function.
Air brakes are a good and safe way of stopping large and
heavy vehicles. There are many components that make up
an air-brake system, such as the air compressor, air
compressor governor, air storage tanks and air tank drains.
These components need to be maintained by
qualified
and
trained technicians
.
S-Cam Brakes
When the brake pedal is pushed, air is let into each brake
chamber (Figure 76). Air Pressure pushes the rod out, moving
the slack adjuster, thus twisting the brake cam shaft. This
turns the s-cam (so called because it is shaped like the
letter "S").
The s-cam forces the brake shoes away from one another
and presses them against the inside of the brake drum. When
the brake pedal has been released, the s-cam rotates back
and a spring pulls the brake shoes away from the drum,
letting the wheels roll freely.
Air Tank Drains
Compressed air usually has some water in it which is
bad
for the air brake system. Water can freeze in cold weather
and thus cause brake failure. The water tends to collect in
the bottom of the air tank.
Daily air tank drainage is required
to remove water from the air tank
.
Brake Drums (or discs), Linings, and Hoses
Brake drums or discs must not have cracks longer than one
half the width of the friction area. Linings must not be loose,
soaked with oil or grease or be dangerously thin. Mechanical
parts must be in place, not broken or missing. Check that
all air hoses connected to the brake chambers are not worn
or cut due to rubbing.
Air Leaks
Always check for brake air leaks before towing the trailer.
NEVER tow the trailer with an brake air leak problem. The
possibility exists of brake failure.
NOTE
Use Table 15 as a basic
troubleshooting guide when
brake problems occur.
DCA-800SSK — MAINTENANCE
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