If the vacuum booster fails, the force on the brake pedal increases significantly, which negatively affects driving.
If the effort on the pedals during braking has noticeably increased compared to normal, check the brake booster with the vehicle stationary.
1. With the engine off, press the brake pedal five or six times with an interval of about 5 seconds; while holding the brake pedal down, start the engine - the brake pedal should move forward. If it doesn't, check..
2.... the integrity and reliability of the connection of the vacuum booster hose with the fitting on the engine intake pipe..
3.... and with an amplifier.
Note. The battery and its mounting shelf have been removed for clarity.
4. Remove the battery (see Removing and installing the battery) …
5.... and a shelf for its fastening (see Removal and installation of the shelf of fastening of the rechargeable battery).
6. To check the operation of the check valve, disconnect the block of the wiring harness from it by pressing on its spring clip.
7. Loosen the clamp securing the hose valve to the inlet pipe, squeezing its bent ears with pliers..
8.... slide the clamp along the hose..
9.... and disconnect the hose from the valve fitting.
10. Remove the hose to the vacuum pump from the holder..
11.... and a valve from the hole in the sealing sleeve of the vacuum brake booster.
12. Insert the spout of the pear firmly into the check valve and squeeze it. The air from the pear should exit through the valve.
Note. For clarity, shown on the removed hose.
13. Release the pear. If it remains in a compressed state, then the valve is working. In the absence of a pear, you can purge the valve with your mouth.
14. If the check valve lets air through in both directions, replace the vacuum hose assembly with the valve, for which..
15.... squeeze the clamps securing the vacuum hose to the inlet pipe fitting, disconnect the hose from the fitting..
16.... and remove the vacuum hose assembly with the check valve.
17. Install the parts in the reverse order of removal.
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