A4 Sedan V6-2.8L (AHA) (1998)
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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Removing and installing. Refer to Brake servo for brake master cylinder with 23.81 mm (0.937 inch) diameter piston, removing and
installing.
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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 at 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.