Figure 6-2.-Drum wear patterns.

Figure 6-3.-Using a drum micrometer to measure the drum.

ATTENTION

CESO Maintenance Bulletin No. 75 directs the Naval Construction Force to use silicone brake fluid. Silicone brake fluid will not mix with glycol brake fluid and no adverse effects will occur to brake parts if it is combined accidently in small quantities. Some of the advantages of silicone brake fluid are that it will not damage painted surfaces, it has excellent dielectric properties, it will not deteriorate during long periods of system storage or climatic exposure, and it will not absorb or retain moisture.

To comply with requirements for testing brakes, you must see that at least one of the wheels is removed to check the brake lining and drum/rotor. Some

Figure 6-4.-Examples of specifications cast into brake drums.