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.

Source. (See Revision Notes at Chapter Heading Saf-C 3200) #8915, eff 6-22-07, EXPIRED: 6-22-15 New. #10886, INTERIM, eff 7-16-15, EXPIRES: 1-12-16; ss by #11016, eff 1-6-16