visible and audible
3.2.6.1 and option codes MPR and MPS,
tires shall be of rated capacity at least
(g)
Service brake stop lamp switch
equal to the load imposed on each tire,
(h)
Automatic moisture ejector on
measured at each wheel, at the ground,
air storage reservoir
with the vehicle loaded to specified GVW.
(i)
Automatic slack adjusters on
Tires shall conform to the Tire and Rim
cam type brakes or internal self-
Association or to The European Tyre and
adjusting brakes on wedge and
Rim
Technical
Organization
disc type brakes on all axles
recommendations.
Under
no
(j)
Brake dust shields on rear
circumstance shall the vehicle maximum
(k)
Spring set parking brake
governed speed exceed the speed rating
of any of the furnished tires.
3.4.11.1.1 AIR DRYER.
An air dryer with a replaceable spin on/off
desiccant cartridge shall be installed in
3.4.10.2 TIRE CHAIN CLEARANCE.
the air brake system. The dryer shall
Tire chain clearance in accordance with
have the capability of removing not less
SAE J683 shall be provided. Allowance
than 95 percent of the moisture in the air
for spring deflection shall be included.
being dried. The dryer shall have a pre-
cooler and a filter to screen out oil and
3.4.11
BRAKES.
solid contaminants. The dryer shall have
Brakes shall conform to Federal Motor
an automatic self-cleaning cycle and a
Carrier Safety Regulations 393.40 through
thermostatically controlled heater to
393.43 and 393.45 through 393.52.
prevent icing of the purge valve. Air dryer
Brake linings shall be of non-asbestos
shall conform to TMC RP 637.
material.
3.4.11.2 TRAILER BRAKE CONTROL
3.4.11.1 SERVICE BRAKES.
SYSTEM.
Vehicles shall be equipped with full-air
In addition to the components specified in
brakes. The braking system, complete
3.4.11.1 and 3.4.11.1.1, a trailer brake
with all necessary components, shall
control system shall be furnished for Type
include:
II tractors and when a trailer-towing
(a)
Air compressor, unloader-head
package option code TTP is required.
type, engine driven and engine
The trailer brake control system shall
lubricated, air or water cooled,
include:
and having a capacity of not
(a) Identification of emergency and
less than 340 L/min (12 cubic
service lines
feet per minute (cfm)).
(b) Coincident control of trailer
(b)
Air storage reservoir(s), each
brakes with prime mover foot
tank equipped with drain, and
control
with safety and check valves
between the compressor and
(c) Independent hand control for
the last reservoir tank
trailer brakes
(c)
Foot control, suspended or
(d) Prime mover protection valve
treadle type
with dash control and automatic
(d)
Air control valves
breakaway feature
(e)
Air pressure gage, visible to the
(e) Trailer stoplight control operable
driver
with foot brake and with hand
(f)
Low air pressure warning,
control for trailer brakes
Federal Standard 807M
Page 19 of 65
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