Jetta Sedan L4-2.0L (BBW) (2005)
Hydraulic Control Assembly - Antilock Brakes: Service and Repair
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.