Passat Wagon 4Motion V6-2.8L (ATQ) (2003)
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Hydraulic Control Assembly - Antilock Brakes: Service and Repair
ABS/EDL/ASR/ESP Bosch 5.7, From M.Y. 2002
Hydraulic Unit, Brake Servo/Brake Master Cylinder, Overview
Hydraulic unit, brake servo/brake master cylinder assembly overview
1 - Tandem brake servo
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On gasoline engines the vacuum required is taken from the intake manifold.
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Vehicles with a gasoline engine and automatic transmission are equipped with a brake vacuum pump, Refer to Vacuum Pump, Brakes, Service
and Repair
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On Diesel engines, a vacuum pump is installed to produce vacuum.
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Functional check
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With engine switched off, depress brake pedal firmly several times (to exhaust the vacuum in the module).
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Depress brake pedal with average foot pressure, hold and start engine. If the servo module is working properly, the pedal will drop slightly
(servo assistance becomes effective).
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If faulty replace.
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With bonded seal
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Removing and installing, Refer to Brake Master Cylinder, Service and Repair
2 - Brake line
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Brake master cylinder/primary piston circuit to hydraulic control unit
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Marked on hydraulic unit with -HZ1-
3 - Brake line
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Brake master cylinder/secondary piston circuit to hydraulic unit
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Marked on hydraulic unit with -HZ2-
4 - Brake line
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To left-front brake caliper
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Marked on hydraulic unit with -FL-
5 - Brake line
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To right-front brake caliper
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Marked on hydraulic unit with -FR-
6 - Brake line
