11.2. Service of the vacuum amplifier (servo-driver) of brakes
Removal and installation
Removal
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- Remove GTTs from the car.
- Disconnect vacuum hoses from the block of the vacuum amplifier.
- Remove a fixing clip, unbend uvulas of the plastic limiter, remove a fixing finger and disconnect a pusher from a brake pedal.
- Give nuts of fastening of the vacuum amplifier and, having taken aside a basic arm of the control valve, remove the amplifier from the car.
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Installation
Installation is made upside-down.
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- Check correctness of adjustment of a pusher of the vacuum amplifier, in case of need make adjustment. Check installation of height of situation and size of a free wheeling of a pedal of a brake, in case of need adjust the listed parameters.
- Tighten fixing nuts with the required effort.
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Functioning check
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- At the killed engine squeeze out several times a brake pedal for dumping of depression of the vacuum amplifier.
- Slightly squeeze out a pedal and hold it in this situation.
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- Start the engine. The pedal has to fail considerably down. Otherwise it is necessary to check serviceability of giving of depression to the block (see an accompanying illustration):
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- Check vacuum hoses for existence of signs of aging of material and other damages. Replace defective.
- Disconnect a vacuum hose from the block of the vacuum amplifier and at the engine working at single turns check existence in it of depression, having stopped up the end of a hose with a thumb.
- Disconnect vacuum hoses, release a fixing collar and remove the control valve from the block of the vacuum amplifier.
- Blow in the valve from the vacuum amplifier. Air has to pass freely.
- Try to prososat air through the same opening of the valve. This time the valve has to be closed. At identification of deviations replace the control valve.
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Adjustment of a pusher
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- Remove the block of the vacuum amplifier from the car.
- Connect to the hose union on the block the manual vacuum pump equipped with the vacuum gage.
- Create depression of 500 mm of mercury in depth in a vacuum tube of the amplifier. also measure the size of a vystupaniye of a pusher And over landing GTTs surface (see an accompanying illustration). Nominal size makes And = 10.275 ÷ 10.525 mm.
- In case of need adjust pusher length, trying to obtain the required size of its vystupaniye.
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