MIL-T-62735 Trucks And Truck Tractors: Modified Commercial, General Specification ForThis specification covers general requirements for the classes, models and types of modified commercial trucks indicated in the specification title above and in 1.2 below. This specification is intended only as a document to be referenced in detail specification sheets that must, as a minimum, cover detailed truck body requirements and specify the model and class required from table I.

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MIL-T-62735

3.3.15.2  Air brakes.  When specified (see 6.2), other class 21 and smaller vehicles shall have full air brakes.  All other vehicles shall have full air brakes.  Model 8x4 and 8x6 vehicles shall meet FMVSS stopping distance requirements with the pusher axle up and with the pusher axle down, all while loaded to specified GVW and GCW.  The air brake system shall be complete with all standard and necessary components and as required by safety regulations and standards, including the following:

(a)   Air compressor rated capacity not less than as specified in table IX. (b)   Unless otherwise specified (see 6.2), an automatic moisture ejector

(c)   Unless otherwise specified (see 6.2), for 4x2, 6x4 and 8x4 models, automatic slack adjusters on cam type brakes or internal self-adjusting brakes on wedge and disc

type brakes; except these features shall not be on any axle on a vehicle when it is not available on all axles of the vehicle as follows:

(1) A single rear axle vehicle with a rear axle rated at over 10 430 kg

(23,000 pounds),

(2) A tandem rear axle vehicle with a rear axle rated at over 20 900 kg

(46,000 pounds).

TABLE IX.  Air compressor capacity.

3.3.15.3  Air dryer.  The air brake system shall have a replaceable cartridge desiccant type air dryer.  The dryer shall have the capability of removing not less than 95 percent of the moisture in the air being dried.  The dryer shall have a pre-cooler and a filter to screen out oil and solid contaminants.  The dryer shall have an automatic self-cleaning cycle.  The dryer shall have a thermostatically controlled heater to prevent icing of the purge valve.

3.3.15.4  Trailer brake control system.  In addition to the components specified in 3.3.15 through 3.3.15.3, air brake vehicles shall be designed and produced to accommodate ready installation of a trailer brake control system conforming to 3.5.21.  When a trailer brake control system is required, the vehicle shall have air brakes.

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