1 - Vacuum hose
2 — the Brake pipeline
3 — the Main brake cylinder
4 - Brake fluid reservoir
The pressure of the driver's foot on the brake pedal is amplified by the brake booster by exploiting the vacuum created in the engine intake piping. In a diesel engine, the vacuum required for this purpose is created by a vacuum pump mounted on the engine flange. The operation of the brake booster must be checked if excessive force is required on the brake pedal to brake the vehicle.
1. Press the brake pedal with the vehicle not running at least five times. Then, with the pedal depressed, start the engine. In this case, the pedal should move noticeably under the driver's foot.
2. Otherwise, open the hood and remove the cover on the driver's side above the brake booster. The brake booster is located in the engine compartment directly on the bulkhead.
3. Disconnect the vacuum hose (1) at the brake booster. Start the engine. Place your finger on the end of the vacuum hose and check for vacuum.
Diesel engine: Disconnect the vacuum hose from the vacuum pump and check the vacuum at the hose connection point.
4. If there is no vacuum, check the tightness of the hose and the presence of damage, if necessary, replace the hose.
5. If there is a vacuum, measure its value, if necessary, replace the amplifier (service station work).