We replace the vacuum brake booster when it fails. If the vacuum booster is faulty, the force on the brake pedal increases significantly
If the force on the brake pedal increases noticeably during braking, you need to check the booster on a stationary car.
With the engine off, press the brake pedal five or six times on the brake pedal.
Holding the brake pedal down, start the engine.
The brake pedal should move forward.
If this does not happen, then the vacuum booster or the check valve of the vacuum booster does not work, and the hose of the vacuum booster may also not be tight.
Vacuum booster valve replacement
Having overcome the resistance of the clamps, we remove the check valve from the sealing sleeve of the brake booster housing.
To assess the serviceability of the check valve, its tube must be disconnected from the fitting of the engine receiver.
To do this, we compress the two retainers of the valve tube tip
And disconnect the tip of the tube from the receiver fitting
Remove the check valve with the tube.
The health of the valve can be assessed by blowing into it (for example, with your mouth) in both directions.
In the direction from the amplifier to the receiver, air must pass, in the opposite direction - no.
We replace the defective valve.
Before installing the valve, check the condition of the rubber seal of the valve tube tip
Check the condition of the rubber sealing sleeve of the valve located in the opening of the vacuum booster housing.
Replacing the vacuum brake booster
Remove the vacuum booster check valve as described above
We unscrew the two nuts securing the brake master cylinder (article - Replacing the Renault Duster brake master cylinder)
To prevent air from entering the hydraulic drive of the brake system, we do not disconnect the brake pipes.
Carefully bending the brake pipes, remove the main brake cylinder from the vacuum booster studs and set aside.
The connection between the master brake cylinder and the vacuum brake booster is sealed with a rubber ring.
In the passenger compartment, under the instrument panel, pry off two noise insulation holders with a screwdriver
Remove the split plastic retaining ring from the pusher pin to the brake pedal
Remove from the brake pedal the spring retainer of the finger of the pusher of the vacuum booster to the pedal
We remove the finger from the holes of the pedal and the pusher eye
With a 13 head, unscrew the four nuts securing the vacuum booster to the bulkhead
Two on the right side of the pedal bracket
And two on the left side
We remove the booster pusher from the hole in the bulkhead and remove the vacuum booster from the engine compartment.
Install the vacuum booster in reverse order.