cam type brakes or internal self-
specified). The hoses shall be
adjusting brakes on wedge and
packaged and stowed in the
disc type brakes on all axles
vehicle tool compartment for
shipment.
(j)
Brake dust shields on rear
(g) Air connectors for trailer with
(k)
Spring set parking brake
SAE J318 glad hand couplers
3.4.11.1.1 AIR DRYER.
mounted at the rear of the
An air dryer with a replaceable spin on/off
vehicle, located to prevent
desiccant cartridge shall be installed in
interference with a trailer (not
the air brake system. The dryer shall
required for Type II tractors
have the capability of removing not less
unless trailer towing package is
than 95 percent of the moisture in the air
specified). Air connectors and
being dried. The dryer shall have a pre-
glad hands on Type IV dumps
cooler and a filter to screen out oil and
shall be located to prevent
solid contaminants. The dryer shall have
damage during dumping of the
an automatic self-cleaning cycle and a
cargo.
thermostatically controlled heater to
(h) Two SAE J844 coiled (or straight
prevent icing of the purge valve. Air dryer
when specified) connecting air
shall conform to TMC RP 637.
hoses, not less than 2800 mm
(110 inches) in length when fully
3.4.11.2 TRAILER BRAKE CONTROL
extended, equipped with coiled
SYSTEM.
spring hose guards, and SAE
In addition to the components specified in
J318 glad hand quick connector
3.4.11.1 and 3.4.11.1.1, a trailer brake
on trailer end of hoses (Type II
control system shall be furnished for Type
tractors only).
II tractors and when a trailer-towing
package option code TTP is required for
(i) Unless
otherwise
specified,
air brake equipped chassis. The trailer
supports on the cab or on a pogo
brake control system shall include:
stick type hose tender with
dummy glad hand connectors to
(a) Identification of emergency and
retain hoses when not in use
service lines
(Type II tractors only). Supports
(b) Coincident control of trailer
shall not be mounted on the cab
brakes with prime mover foot
roof.
The dummy glad-hand
control
couplers shall be located on the
street side rear of the cab and
(c) Independent hand control for
shall be accessible to an
trailer brakes
operator standing on the ground.
(d) Prime mover protection valve
Supports shall conform to TMC
with dash control and automatic
RP 417.
breakaway feature
(j) Dummy glad hand couplers with
(e) Trailer stoplight control operable
security chains or cables (not
with foot brake and with hand
required for Type II tractors
control for trailer brakes
unless a trailer towing package is
(f) Two SAE J844 coiled air hoses,
specified).
not less than 2800 mm (110
(k) Prime mover only parking brake
inches) long when fully extended,
valve to permit mover parking
with SAE J318 glad hand
brakes to be applied while
couplers on both ends of hoses
charging the trailer air brake
(not required for Type II tractors
system.
unless a trailer towing package is
Page 19 of 79
to verify that this 7 4Y
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