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|  MIL-T-62518A
3.1.1.10 Drive hubs. When specified for model 4x4, class A and B vehicles (see 6.2),
manually operated drive hubs for disengaging the front wheels from the drive train shall be
provided, except for vehicles equipped with interaxle compensating devices between front and
rear axles (see 3.4.5.1.2), or air brake equipped chassis.
3.1.1.11 Silicone brake fluid. When specified for class A and B vehicles (see 6.2), and if
available as manufacturer's standard or optional brake fluid, silicone brake fluid conforming to
MIL-B-46176 shall be provided in the hydraulic brake system. A tag on the master cylinder or a
permanent decal near the master cylinder shall be furnished stating "CAUTION: USE
SILICONE BRAKE FLUID ONLY, MIL-B-46176."
* 3.1.1.12 Brake lights. At least one pair of brake lights shall override the four-way
emergency flasher or the two systems shall be independent of each other. Modifications to the
manufacturer's standard product to accommodate this requirement shall not compromise
conformance to any Federal Motor Carrier Safety Regulation referenced herein or to any Federal
Motor Vehicle Safety Standard. If additional lights are added to the vehicle, the lights shall be
selected from the chassis manufacturer's standard matching hardware.
* 3.1.1.13 4x4 conversion. The chassis manufacturer's standard 4x2 truck chassis may be
modified to provide all wheel drive conforming to the requirements specified herein if:
(a) The conversion axle manufacturer's engineering department specifically approves and
certifies that all such modifications meet the design requirements and standards of the
conversion axle manufacturer. Certification shall be based on both design analysis and
proving ground test reports, which shall be made available to the engineering and
quality assurance offices of the procuring activity.
(b) The chassis manufacturer's front axle before conversion has the same load rating as the
conversion axle to be installed.
(c) Components used in the all wheel drive conversion are of current production.
(d) Components used in the all wheel drive conversion are approved for the conversion
application by the component manufacturers.
(e) The converted vehicle is certified to conform to Federal Motor Vehicle Safety
Standard, No. 121, by the intermediate or final manufacturer.
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