Contents: Arrangement of elements ⇩ Vacuum elements ⇩
Arrangement of elements
NOTE: Left hand drive version shown, same for right hand drive version.
| Pos. | Spare part number | Name |
| A | - | Brake Booster Component Locations - i6 Engine |
| B | - | Brake Booster Component Locations - TD4 Engine |
| 1 | - | Vacuum Pipe - i6 Engine |
| 2 | - | Vacuum pump - i6 engine |
| 3 | - | Vacuum tube - TD4 engine (up to 2010 MY) |
| 4 | - | Vacuum pump - TD4 engine |
| 5 | - | Check valve |
| 6 | - | Vacuum brake booster |
The operation of the brake system is supported by an inactive type vacuum booster.
The brake booster is a compact unit, it takes up less space than a conventional brake booster and improves the vehicle's performance in a collision. The unit is equipped with jointly acting tandem diaphragms with a diameter of 203.20 mm and 228.60 mm.
The unit is located in the engine compartment on the driver's side, hermetically sealed against the engine compartment bulkhead with a gasket and secured with four studs and nuts. The brake booster pushrod is connected to the brake pedal by means of a pin. The output pushrod of the booster is located in the main piston of the master brake cylinder. For additional information, refer to the chapter: Brake Hydraulic Drive (206-06 Brake Hydraulic Drive, Description and Operating Principle).
Vacuum elements
On both the i6 petrol engine and the TD4 diesel engine, the vacuum required to operate the brake booster is generated by a vacuum pump mounted at the rear of the cylinder head. The vacuum pump is driven by the intake camshaft.
A rigid plastic pipe connects the vacuum pump to the check valve, which is mounted on the front chamber of the brake booster. The length and layout of this pipe differs between left-hand and right-hand drive models.
The check valve maintains the vacuum required for the brake booster to operate and does not allow air to enter the front chamber.
Vehicles equipped with the Stop/Start system - starting from 2010 MY
| Pos. | Spare part number | Name |
| 1 | - | Brake booster vacuum sensor |
Brake booster vacuum sensor
The brake vacuum sensor, found on vehicles with Stop/Start, monitors the vacuum level in the brake servo. The vacuum sensor is mounted in a vacuum tube and is wired to the ECM. For more information, refer to: Starting System (303-06C Starting System - 2.2L Duratorq - Td4, Vehicles Built Since 03/2009, Description and Operation).
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