If a truck or bus is equipped with an inspection port or dust shield which can be removed to determine the condition of the drum and the brake-block thickness, the mechanic shall not be required to pull a wheel, but brakes on all the wheels shall be visually inspected through the inspection ports.
N.H. Admin. Code § Saf-C 3226.05
(See Revision Notes at chapter heading Saf-C 3200) #8915, eff 6-22-07