A4 Sedan L4-2.0L Turbo (BPG) (2005)
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Vacuum Brake Booster: Service and Repair
Tandem brake booster / brake master cylinder, assembly overview
Note:
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Brake master cylinders can no longer be disassembled, i.e. no provision is made for servicing.
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Use only new brake fluid. Observe information on brake fluid reservoir!
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Assignment of brake line connections
1. - a - Vacuum hose
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On gasoline engines the vacuum required is taken from the intake manifold and/or a mechanical vacuum pump.
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Insert into brake booster unit
1. - b - Vacuum hose
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On gasoline engines the vacuum required is taken from the intake manifold and/or a mechanical vacuum pump.
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An additional electrical vacuum pump is installed on vehicles where vacuum is taken from intake manifold only
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Insert into brake booster unit
2. Trunnion bolt, 8 Nm
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Screw in as far as stop
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Unscrew to remove brake fluid reservoir
3. Brake fluid reservoir with float warning indicator
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Functional test
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With the ignition switched on, remove filler cap and press with your hand on the strainer that is visible in the reservoir.
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Warning lamp in instrument cluster should light up and acoustic alarm should sound.
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Refer to label on reservoir before topping off brake fluid
4. Filler cap
5. Sealing plug
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Moisten with brake fluid and insert into brake master cylinder
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Press brake fluid reservoir into sealing plugs
