Originally Posted by Markeb
Also, I believe it's a federal requirement that all motor vehicles must have functioning emergency/parking brakes. There may be others, but for example under:

FEDERAL
MOTOR VEHICLE
SAFETY STANDARDS
AND REGULATIONS

U.S. DEPARTMENT OF TRANSPORTATION

NATIONAL HIGHWAY TRAFFIC
SAFETY ADMINISTRATION

Standard No. 105 - Hydraulic and Electric Brake Systems - Passenger Cars (Effective 1-1-68)
This standard specifies requirements for vehicles equipped with hydraulic and electric service brake systems and associated parking brake systems to ensure safe braking performance under normal conditions and emergency conditions.

but if it did not come equipped as standard equipment proir to that date they can be exempted from having one, though these trucks did come so equipped
ron