Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSSUBARU2014IMPREZA SPORT LIMITEDREPAIR AND DIAGNOSISMAINTENANCEPROCEDURESGENERAL INFORMATIONBRAKE LINEINSPECTIONBRAKE SERVO SYSTEM

2014 Subaru Impreza Sport Limited

Brake Servo System

2014 Subaru Impreza Sport LimitedSECTION Brake Servo System

With the engine off, depress the brake pedal several times applying the same pedal force. Check that the travel distance should not change.
With the brake pedal depressed, start the engine. Check that the pedal moves slightly toward the floor.
With the brake pedal depressed, stop the engine and keep the pedal depressed for 30 seconds. Check that the pedal height does not change.
A check valve is built into the brake booster nipple. Disconnect the vacuum hose to inspect function of check valve.
Check that check valve ventilates from booster side to engine side. Also, check that there is no ventilation from engine side to booster side.
- Gasoline engine model
  
  Fig 1: Identifying Brake Servo System (Gasoline Engine Model)
  Courtesy of SUBARU OF AMERICA, INC.
- HEV model
  
  Fig 2: Identifying Brake Servo System (HEV Model)
  Courtesy of SUBARU OF AMERICA, INC.
Check the vacuum hose for cracks or other damage.
CAUTION: When installing the vacuum hose on the engine and brake booster, do not use soapy water or lubricating oil on their connections.
Check that the vacuum hose is securely tightened.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.