Description
BOSCH Vacuum Pump For Citroën And Peugeot Vehicles With 1.4 HDi, 1.5 BlueHDi, 1.6 HDi, 1.6 BlueHDi And 1.6 e‑HDi Engines. Mechanical Vacuum Pump.
High‑quality Bosch vacuum pump designed for PSA Group diesel engines, delivering reliable vacuum supply for brake servo and engine systems. Ideal for professional workshops and DIY mechanics looking for a direct replacement part by part number (9684786780 / 456584). Robust construction and OEM fitment ensure accurate installation, stable vacuum performance and long service life under normal operating conditions.
Compatibility
Fits Citroën and Peugeot vehicles equipped with the following engines: 1.4 HDi, 1.5 BlueHDi, 1.6 HDi, 1.6 BlueHDi and 1.6 e‑HDi. Common applications include a range of PSA models such as C3, C4, Berlingo, Partner, 207, 208 and 308, and other vehicles using the listed engines. Customers often search by product codes: 9684786780 and 456584.
Technical Information
- Manufacturer: Bosch
- Model: Citroën / Peugeot – Engines: 1.4 HDi, 1.5 BlueHDi, 1.6 HDi, 1.6 BlueHDi, 1.6 e‑HDi
- Product Codes: 9684786780, 456584
- Other Numbers: No additional numbers provided
Function And Application
This mechanical vacuum pump generates the vacuum required by the brake servo (power brake booster) and other vacuum‑dependent systems on diesel PSA engines. It is typically mounted on the cylinder head or engine block and driven mechanically by the engine. A correctly functioning vacuum pump is essential for consistent brake assist, stable idle and proper operation of auxiliary systems that rely on vacuum.
Installation Recommendations
- Work Safely: Park the vehicle on a level surface, engage the handbrake and wear appropriate protective equipment.
- Preparation: Disconnect the negative battery terminal before starting work to avoid electrical incidents and clear any stored faults after installation if required.
- Removal: Remove intake ducts, vacuum hoses and any obstructing components to access the pump. Note the routing of vacuum lines and electrical connectors; photograph connections if needed.
- Gasket And Seals: Always replace mounting gasket/seal and any related O‑rings to prevent vacuum leaks.
- Fastening: Tighten bolts to the manufacturer’s torque specifications. If torque values are not available, consult the vehicle service manual.
- Post‑Installation Checks: Inspect all vacuum hoses and connections for leaks, verify brake booster vacuum and perform a test drive to confirm proper brake assist and engine behavior. Clear diagnostic trouble codes if any appear.
- Professional Tools: Use a vacuum gauge to confirm pump output where possible. If you lack specific tools or experience, have the replacement carried out by a qualified technician.
Reasons For Failure
Vacuum pumps most commonly fail due to internal wear of moving parts (vanes or bearings), oil contamination, degradation of seals, or damage to vacuum lines and fittings. High mileage, lack of maintenance, contaminated engine oil and blocked vacuum hoses accelerate wear. External damage from debris or improper installation can also cause premature failure. When the pump loses efficiency, drivers typically notice reduced brake assist, harder brake pedal feel or engine management faults related to vacuum‑dependent systems.
Why Buy This Part
Buying a Bosch vacuum pump with the correct product codes (9684786780 / 456584) ensures OEM‑level fitment and performance for PSA diesel engines. The part is a practical choice for workshops and competent DIY mechanics who need a reliable replacement to restore brake assist and vacuum‑dependent functions quickly.
