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.
Power Brake Booster
Release clamp and detach vacuum hose. Connect Tester (343100) between connection and vacuum non-return valve. Start engine. Check whether a vacuum forms. Switch off engine. Depress brake pedal to set a maximum value of .86 bar, then wait until the value stabilizes. When the brake pedal is not depressed, the value may drop by a maximum of .06 bar within a test period of one minute. See Fig 1.
NO RELATED
Use the Manual With the Right Hardware
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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.