A4 Quattro Wagon V6-2.8L (AHA) (1998)
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On Diesel engines vacuum is supplied from the vacuum pump
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Functional check:
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With engine switched off, depress brake pedal firmly several times (to deplete vacuum in brake servo).
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Depress and hold brake pedal with average foot pressure and start engine. If servo is working properly, pedal will be felt to give slightly under
foot (servo assistance becomes effective).
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If malfunctioning:
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Replace as complete unit only.
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Check valve in vacuum hose - 9 -
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Adjusting ball head; Refer to Fig.1
8. Gasket
9. Vacuum hose
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Insert into brake servo
10. Brake fluid reservoir
11. Fluid reservoir cap
12. Sealing plugs
13. Supply hose
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Where applicable
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From brake fluid reservoir to clutch master cylinder
14. Bulkhead
Fig. 1 Adjusting ball head
Dimension -A- = 159 - 0.5 mm (6.26 0.020 inch)
Note:
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The ball head must be positioned right angles to the mounting surface of the brake servo unit when measuring.
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Measure up to end of ball head with no gasket installed.