Subaru 26402AE47A Vacuum BSTR Assembly LH

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To inspect disc brakes, you should loosen wheel lug nuts, raise the vehicle on jackstands, remove the wheels, and check pad thickness by inspecting through the caliper's inspection window. Replace pads if lining material is too thin. If uncertain, remove the caliper for further inspection. Clean and re-measure pads with brake cleaner. Measure disc thickness with a micrometer and inspect for damage. Before reinstalling wheels, check brake lines and hoses for damage, wear, leakage, and proper routing.

The power brake booster unit requires no special maintenance apart from periodic inspection of the vacuum hose and the case.

To check operation, depress the brake pedal several times with the engine off and make sure there is no change in the pedal reserve distance. When the engine is running, if the pedal goes down slightly, operation is normal.

The process for inspecting brakes involves loosening the wheel lug nuts, raising the vehicle on jackstands, and removing the wheels. For disc brakes, the inspection includes checking pad thickness, measuring disc thickness, and examining the condition of the discs for scoring, gouging, or burned spots. Brake lines and hoses are inspected for damage, wear, leaks, and other issues. For drum brakes, the parking brake must be off, and the brake drums are removed for cleaning and inspection. The thickness of lining material on brake shoes is measured and compared to specifications. All brake assembly springs are checked, and components are inspected for signs of fluid leakage. The brake drum's interior is cleaned and checked for imperfections, and the procedure is repeated for the remaining wheel.