Pretrip Inspection and Daily Maintenance 35.6 Observe the hose cover condition, especially hoses exposed to water splash and ice. If any hose is dried out or ragged (the wire or liner is showing through the cover), replace the hose. 35.9 Check the bend radii of all hoses. See Fig. 9.4 . The minimum bend radius of a hose is that bend which the hose will with- stand without experiencing damaging stresses or kinking. For minimum bend ra- dius values, see Group 42 of the Cargo Workshop Manual. 35.7 Inspect the front air brake lines for leaks at the fitting where they enter the air chamber.
When a rubber hose does not meet mini- mum bend radius requirements, the outside may appear smooth even if the inner tube is kinked. Reroute the hose or replace it with one of adequate length if the bend radius is not within minimum specifications. With an assistant at the front wheels to in- spect the brake lines, turn the wheels to full lock in one direction and hold the service brake pedal down. Inspect the front brake air lines closely near where they enter the air chambers. Turn the wheels to full lock in the other di- rection, hold the service brake pedal down, and repeat the inspection. If there is a leak, the hose should be re- placed.
See Group 42 of the Cargo Work- shop Manual for the hose replacement pro- cedure. 35.8 Inspect air tubing, especially tubing made of nylon. In cold weather, nylon tubing is sensi- tive to damage, such as nicks or cuts. Re- place nicked or cut tubing, even if it is not leaking. 11/03/94 f420329a A NOTE: Center of the hose bend radius should be well away from the fitting. A. Bend Radius Fig. 9.4, Bend Radius 9.17