A4 Quattro Wagon L4-1.8L Turbo (AEB) (1999)
Brake Master Cylinder: Description and Operation
W/ 25.4 mm (0.999) Piston Diameter
Brake master cylinder with 25.4 mm (0.999 inch) diameter piston and brake servo, component summary
Note:
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Brake master cylinders can no longer be disassembled, i.e. there is no provision for servicing.
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Use only fresh brake fluid. Pay attention to information on the brake fluid reservoir
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Brake line connections to master cylinder, Bosch 5.0 ABS system. Refer to Anti-lock Brake System (ABS), Bosch 5.0. Bosch 5.3 system, refer to
Anti-lock Brake System (ABS), Bosch 5.3.
1. Brake master cylinder
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Diameter: 25.4 mm (0.999 inch)
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Cannot be repaired. If malfunctioning, replace as complete unit only.
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Must be removed and installed together with the brake servo
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Removing and installing. Refer to Brake master cylinder with 25.4 mm (0.999 inch) diameter piston and brake servo, removing and installing
as a unit.
2. T45 Torx(R)
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25 Nm (18 ft. lbs.)
3. Flange nut
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Always replace
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50 Nm (37 ft. lbs.)
4. 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
5. Brake fluid reservoir with brake fluid level warning switch
Functional check:
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Remove brake fluid reservoir cap and with the ignition switched on push on strainer in reservoir.
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The warning light in the instrument panel insert comes on and an audible warning signal sounds.
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Removing and installing
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Fluid couplings are on the side of the reservoir
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Pay attention to information found on the label on the reservoir before adding fluid
6. Seal
7. Brake fluid reservoir cap
8. Fluid supply hose
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From brake fluid reservoir to clutch master cylinder
9. Seal