S4 Quattro Wagon V8-4.2L (BHF) (2008)
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Brake Bleeding: Description and Operation
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. 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
