Golf L4-2.0L (AZG) (2004)
Hydraulic Control Assembly - Antilock Brakes: Service and Repair
ABS ITT Mark 20 IE
Hydraulic Unit, Brake Booster/Master Cylinder, Overview
Hydraulic unit, brake booster/master cylinder, overview
Note: Complete brake master cylinders and brake boosters can be replaced separately.
1. Brake Booster
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For gasoline engines vacuum is taken from the intake manifold
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Diesel engines have a vacuum pump to create the required vacuum
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Functional check:
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With engine switched off, depress brake pedal firmly several times (to exhaust vacuum in the unit)
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Hold brake pedal with average foot pressure in brake position and start engine. If brake booster is functioning properly, brake pedal should
give noticeably underfoot.
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If pedal does not give, replace brake booster
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Check valve (in vacuum hose)
Functional check
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Separating from brake pedal.
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Removing and installing
2. Cap
3. Brake fluid reservoir
4. Plug
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Coat with brake fluid and press into reservoir
5. Retaining pin
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Insert through brake master cylinder
6. Brake master cylinder
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Cannot be repaired. If faulty, replace as complete unit
7. Hex nut, self-locking 20 Nm (15 ft. lbs.)
8. Bolt, 8 Nm (70 inch lbs.)
9. Cap nut, 20 Nm (15 ft. lbs.)