Subaru Legacy BN/BS (2015-2019) Owners Manual: Brake booster

Subaru Legacy BN/BS (2015-2019) Owners Manual / Maintenance and service / Brake booster

If the brake booster does not operate as described in the following procedure, have it checked by your SUBARU dealer.

With the engine off, depress the brake pedal several times, applying the same pedal force each time. The distance the pedal travels should not vary.
With the brake pedal depressed, start the engine. The pedal should move slightly down to the floor.
With the brake pedal depressed, stop the engine and keep the pedal depressed for 30 seconds. The pedal height should not change.
Start the engine again and run for approximately 1 minute then turn it off.
Depress the brake pedal several times to check the brake booster. The brake booster operates properly if the pedal stroke decreases with each depression.

Recommended clutch fluid

Refer to "Fluids" F12-8. CAUTION Never use different brands of clutch fluid together. Also, avoid mixing DOT 3 and DOT 4 brake fluids even if they are the same brand ...

Brake pedal

Check the brake pedal free play and reserve distance according to the maintenance schedule in the "Warranty and Maintenance Booklet". ...

Other materials:

Regarding malfunction
CAUTION Never leave or store the access key inside the vehicle or within 6.6 ft (2 m) around the vehicle (e. g., in the garage). The access key may be locked inside the vehicle, or the battery may discharge rapidly. Note that the push-button ignition swit ...