Functional check
2. Without starting the engine, depress the foot brake pedal several times. Check that there is no change in pedal back travel (distance between pedal and floor).
3. Keeping the pedal depressed, start the engine. If immediately after starting the pedal is noticeably «fails», therefore, the vacuum brake booster is working properly. Otherwise, on gasoline models, disconnect the vacuum hose from the brake booster and, with the engine running, place your finger on the hose opening - check if a vacuum is created in the hose. On diesel models, disconnect the hose from the vacuum pump and check the vacuum at the pump connection.
Note: On diesel models, too much depressing the brake pedal at low engine speeds (for example, at stops, traffic jams, etc.) leads to a decrease in the depth of discharge and a deterioration in brake control. This is not a malfunction - be careful.
4. If there is no vacuum, check the tightness of the hose and the quality of the tightening of all clamps, if necessary, replace the hose. At a service station, you can check the amount of vacuum created using a special device. If all indicators are normal and the hose is tight, replace the amplifier.
Removal and installation
5. To remove the vacuum pump assembly, it is necessary to provide access to it and its fasteners both from the side of the engine compartment and from the side of the driver's footwell. To do this, depending on the layout, it may be necessary to dismantle the expansion tank, battery with a pallet, fuse mounting block, foot brake pedal, GTZ and some other components - see the relevant sections of the Manual.
6. Remove the mounting bolts and remove the pump assembly from the rear bulkhead of the engine compartment. The amplifier cannot be repaired and must be replaced in case of failure.
7. Installation is carried out in the reverse order.
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