Subaru 26402AG15A Vacuum BSTR Assembly LH

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For the airtightness check, start the engine and turn it off after one or two minutes. Depress the pedal slowly and if it goes down farther the first time but gradually rises after the second or third depression, the booster is airtight. Additionally, depress the brake pedal while the engine is running and stop the engine with the brake pedal depressed. If there is no change in the pedal reserve travel after holding the pedal for 30 seconds, the booster is airtight.

To test the brake booster, perform a series of tests as described while seated in the driver's seat. If the brakes do not operate as described, the brake booster has failed.

To remove the booster, disconnect the vacuum hose, remove the master cylinder, disconnect the booster pushrod clevis from the brake pedal, and remove the four booster-to-firewall nuts.

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.