This No4 brake test checklist guides technicians through standardized inspections for locomotives and tractors. It covers charging procedures, pressure gauge verification, reservoir and brake pipe leakage limits, compressor governor settings, compressor capacity tests, No. 4 automatic brake valve checks, straight air brake performance, brake cylinder leakage tolerances, safety valve settings, and operational fail-safe tests. The final section includes general mechanical checks such as brake rigging, slack adjusters, handbrake function, sanding equipment, horn, wipers, vigilance, and deadman devices.
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