When increasing the force on the brake pedal, it is necessary to check the performance of the vacuum booster

Depress the brake pedal to the stop several times with the engine off and, keeping the pedal depressed, start the engine

At the same time, due to the pressure drop in the cavities of the booster, the brake pedal should move forward.

If this does not happen, check the tightness of the vacuum booster hose connections and, if necessary, eliminate air leakage. If this does not give a positive result, then the amplifier is faulty and must be replaced.

To check the tightness of the vacuum booster, open the hood and start the engine for 1 minute.

Approximately 30 seconds after the engine has been turned off, press the brake pedal 2 times, while a characteristic hiss of air entering the amplifier should be heard.

Otherwise, replace the amplifier.

Blow out the hose with check valve at both ends.

Air must only pass through the side of the non-return valve. Otherwise, replace the non-return valve.

Replacing the vacuum brake booster

Remove the master brake cylinder without disconnecting the brake pipes from it How to remove and install the master brake cylinder of a Gazelle car

Replacing the vacuum brake booster of a Gazelle car Replacing the vacuum brake booster of a Gazelle car

Loosen the clamp with a screwdriver

Remove the vacuum supply hose from the fitting.

Replacement of the vacuum brake booster of the Gazelle car Replacing the vacuum brake booster of a Gazelle car

The hose can also be removed with the fitting.

Remove the lock washer from the cabin side with a screwdriver.

Replacing the vacuum brake booster of the Gazelle car Replacing the vacuum brake booster of a Gazelle car

Holding the pusher eye bolt with the “19” key, unscrew the nut with the “17” key

Remove the bolt from the pusher eye.

Replacing the vacuum brake booster of the Gazelle car Replacing the vacuum brake booster of a Gazelle car

Remove two plastic bushings from the pusher eye

Using a “13” head with an extension from the cab, unscrew the four nuts securing the amplifier to the partition of the engine compartment

Replacement of vacuum brake booster for GazelleReplacing the vacuum brake booster of a Gazelle car

Remove the amplifier.

Remove the paronite gasket.

Replacing the vacuum brake booster of the Gazelle car Replacing the vacuum brake booster of a Gazelle car

We install the new vacuum booster in the reverse order, while for the correct operation of the brakes, the position of the adjusting bolt should be adjusted.

To do this, holding the pusher with the “8” key, unscrew the lock nut with the “10” key.

Then, with the “8” key, unscrewing or wrapping the bolt

Replacement of vacuum brake booster for GazelleReplacing the vacuum brake booster of the Gazelle car Replacing the vacuum brake booster of a Gazelle car

We achieve such a position in which the gap between the mating plane of the amplifier and the bolt head is within 1.35–1.65 mm.

After that, while holding the bolt, tighten the locknut.

Having lubricated the plastic bushings, we install the booster, after which we adjust the stroke of the brake pedal.

To do this, while holding the pusher of the amplifier with the “8” key (for clarity, it is shown on the removed amplifier), unscrew the locknut with the “14” key

By rotating the pusher eye, we set the distance between the center of its hole and the mating surface of the vacuum booster housing - 131–133 mm. Installing the master brake cylinder.

The free travel of the brake pedal with the engine off should be 3–5 mm.