Master Cylinder

WARNING: This page is about a different car, the 2015 Subaru Outback and 2015 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

When the master cylinder assembly is replaced or the reservoir tank is empty, bleed the brake master cylinder and the clutch master cylinder (MT model).
If bleeding of the master cylinder assembly is not necessary, omit the following procedures, and perform bleeding of the brake line. <Ref. to BRAKE LINE , PROCEDURE, Air Bleeding.>

Add the brake fluid to the reservoir tank of the master cylinder assembly.
NOTE:
- MT model: Add the brake fluid until it flows out from the clutch hose nipple.
- Except for MT model: Add the brake fluid up to the "MAX" level.
- While bleeding air, keep the reservoir tank filled with brake fluid at MIN level or higher to prevent entry of air.
Disconnect the brake line at primary and secondary sides.
Wrap the master cylinder assembly with a plastic bag.
Depress the brake pedal slowly and hold it.

Fig 1: Pressing Brake Pedal
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Plug the outlet plug with your finger, and then release the brake pedal.

Fig 2: Releasing Brake Pedal
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Repeat the step 4) and 5) several times.
Remove the plastic bag.
Turn and tighten the flare nut (b) by hand while pressing the brake pipe (a) toward the master cylinder assembly side.
CAUTION: Be careful not to make scratches or other damage to the inside surface of the brake pipe flare.

Tightening torque:

Brake pipe flare nut: 19 N.m (1.9 kgf-m, 14.0 ft-lb)

Fig 3: Turning Flare Nut
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Bleed air from the brake line. <Ref. to BRAKE LINE , PROCEDURE, Air Bleeding.>