Replacing the brake master cylinder and vacuum booster

In case of damage to the master cylinder it needs to be replaced. When assembling the brake cylinder must be carefully monitor the cleanliness of the workplace and assembled parts.

In preparation for replacement:

- Switch off the ignition;

- Disconnect the negative battery cable;

- Clean the engine compartment area around the brake master cylinder, and overlaid them with rags;

- Repeatedly press the brake pedal, to get rid of the negative pressure in the system;

- Drain the brake fluid reservoir: a car with a manual gear change, disconnect the supply hose to the brake fluid to the clutch, shut his hole;

- Disconnect the brake fluid level in the reservoir;

- Remove the cover of the connector;

- Disconnect the vacuum hose from the vacuum brake booster;

- Remove the fuse box and set it aside (Fig. 6.20, b);

- Loosen and remove the air pump from the holder (Fig. 6.20, a).

Replacing the brake master cylinder and vacuum cylinder includes a number of works which should be carried out in this order:

1) Remove the master cylinder:

- Disconnect brake lines 1 and 2 from the master cylinder, muffle opening;

- Remove the bolts fastening the pressure reducing valve 4 to the bracket;

- 3 Remove the nuts securing the cylinder to the vacuum amplifier;

- Remove the bracket relief valve and master cylinder with O-ring;

2) Remove the vacuum brake booster:

- Remove from the interior dashboard, the retaining bracket, a washer and a pin with a pusher, remove the four screws of the vacuum brake booster;

- Remove from the engine compartment, and the brake servo seal;

3) Install the brake servo:

- Clean the vacuum brake booster and the torpedo bulkhead;

- Put in the engine compartment of the new gasket brake servo and brake servo at bulkhead dashboard, making sure that the brake pedal is properly rose in the plunger;

- Put the salon four nuts (tighten to 25 N ?� m), pin, washer and a retaining spring clip on the plunger, pribotnuyu panel;

- Check the brake light switch;

- Connect the vacuum hose to the vacuum brake booster; place holder for a pressure reducing valve;

4) set the master cylinder:

- Put a new O-ring on the master cylinder;

- Adjust the position of the master cylinder: the brake servo pushrod should properly stand in the master cylinder;

- Connect the brake pipes to the master cylinder and the bracket bolt and tighten the throttle valve with your fingers;

- Tighten the master cylinder nuts and bolt of a pressure reducing valve, tighten them to 25 Nm;

- Connect the level sensor in the brake fluid reservoir.

- Connect to the master cylinder reservoir hose brake fluid in the clutch (for vehicles with manual transmission);

5) Fill the tank with brake fluid, tighten the brake pipe, if it starts to leak brake fluid. Tighten 14 N ?� m;

6) Replace the removed items:

- Preheating a hose;

- The cover of the connector;

- The air pump into the holder, tightening torque 10 Nm;

- The fuse box tightening torque of 10 Nm.

7) Check the pressure in the brake and clutch systems, if necessary, bleed them.