A4 Quattro Wagon V6-2.8L (AHA) (1998)
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Hydraulic Control Assembly - Antilock Brakes: Description and Operation
Anti-Lock Brake System (ABS), Bosch 5.3
A traction control system (TCS/ASR) is available as optional equipment for front-wheel-drive models.
The brake system of the ABS is split diagonally. The brake servo assistance is provided pneumatically by a vacuum brake servo unit.
Hydraulic unit -a- and ABS control module -b form a single unit. The combination of these two components is termed the hydraulic control unit.
Sources of malfunctions are reduced as a result of the direct link between the two components.