Servo (VW Golf 2)

To remove the servo you need to:

1. Remove the brake cylinder as described in paragraph 5 of this section.

2. Disconnect the low pressure flexible hose from the servo and, if necessary, the shut-off valve.

3. Remove the lower instrument panel housing from the driver's side.

4. Remove the safety catch from the kingpin securing the servo pusher 15 and remove the kingpin.

5. Unscrew the 4 nuts securing the servo body to bracket 7. Remove the servo.

Installation

6. Assembly is performed in the reverse order of disassembly. Before installation, both kingpins must be coated with a small amount of grease. Defective nuts securing the servo must be replaced with new ones.

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7. Damage to the servo valve can cause so-called by-pass air to be sucked into the intake manifold. This is indicated by a change in engine idle speed after pressing the brake pedal. If damage is suspected, the valve must be replaced with a new one.

Low pressure pump

In diesel engines, the reduced pressure in the supply manifold required for the servo to operate does not exist. The reduced pressure is created by a vacuum pump (photo 8.2). The vacuum pump is driven by an intermediate shaft with a vane (photo 8.3).





The drive fin is offset from the shaft axis, so during assembly it is necessary to accurately position the cutout in the pump shaft in relation to the drive fin.



To check the operation of the vacuum pump, you must:

1. Remove the elastic hose from the pump nipple.

2. Start the engine.

3. Cover the nipple hole. Check whether a vacuum is created. If the pump does not create a vacuum, you can remove the pump cover, marking its position in relation to the body (photo 8.4).



4. The pump condition must be checked at an authorized service station.