Subaru 26402SA070 Vacuum Booster Assembly

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Also, the power brake booster unit does not need any special maintenance, but it may require a regular check on vacuum hose and its casing. To check if it is working properly press the pedal without starting the engine for several times; there should be no change in pedal reserve distance. Next, push the pedal and start your engine. If it slightly goes down, then everything is alright. For air tightness inspection, start an engine and switch off after one or two minutes of running. Then slowly depress the pedal. If on first depression the pedal goes further down and then gradually rises on second and third depressions means that booster is airtight. In addition to that, with your engine running,repeatedly press the brake pedal down until you stop the car by depressing the brake pedal at once,till when you have held down for 30 seconds without any change in reserve travel of pedal,this booster is airtight.In case this booster has malfunctioned ,it cannot be repaired but must be changed with a new or rebuilt unit. To take out this booster disconnect vacuum hose ,remove master cylinder as well.Then inside vehicle remove cotter pin,pushrod clevis pin to unlock brake booster pushrod clevis from behind brake pedals.Lastly remove four nuts from firewall that holds back up into place.Remove those four nuts from back side of firewall.Relatively speaking,it is simple for installation though tightening of those nuts which hold this booster against dashboard must be done.If new power brake boosters are being used,the length of push rod can be adjusted by turning it to right position using adjusting nut which will eventually lock nut.To complete,the last thing to do before hitting road again would be bleeding brakes again.

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.

To check air tightness, start the engine and turn it off after one or two minutes, then depress the pedal several times slowly. If the pedal goes down farther the first time but gradually rises after the second or third depression, the booster is airtight.

A power brake booster check involves ensuring that the pedal movement is consistent with engine starts and stops.