Description
Bosch Vacuum Pump for Citroën and Peugeot Vehicles with 1.6 HDi and 1.6 e-HDi Engines.
High-quality Bosch vacuum pump designed for PSA Group diesel engines 1.6 HDi / 1.6 e-HDi. This vacuum pump supplies the brake servo and other vacuum-operated systems with steady vacuum even under high-load conditions. It is a common direct-replacement part for many Citroën and Peugeot models equipped with the 1.6 HDi family of engines and is often referenced by product codes 9684786780 and 456584.
Why Choose This Vacuum Pump
Built by Bosch, a leading supplier of automotive vacuum systems, this unit delivers reliable vacuum generation and consistent performance. It helps restore proper brake assist and engine vacuum-dependent functions, improving safety and drivability. The pump is suitable for professional workshops and competent DIY mechanics who are familiar with diesel engine service.
Typical Compatibility
- Fits many PSA models equipped with 1.6 HDi / 1.6 e-HDi engines.
- Common examples: Citroën C3, C4, C5, Berlingo; Peugeot 207, 307, 308, 3008, Partner (1.6 HDi / e-HDi variants).
- Searchable by part numbers: 9684786780, 456584.
Technical Information
- Manufacturer: Bosch
- Model: Vehicles with 1.6 HDi / 1.6 e-HDi Engines (Citroën, Peugeot)
- Product Codes: 9684786780
- Additional Numbers: 456584
Function And Symptoms Of Failure
The vacuum pump generates negative pressure required by the brake servo and some emission or turbo control actuators. When the pump loses efficiency or fails, typical symptoms include:
- Harder brake pedal and increased stopping distance.
- Intermittent or permanent illumination of dashboard warning lights related to braking or engine management.
- Rough idle or loss of vacuum-dependent functions.
Why The Part Commonly Fails
- Internal Wear: Vanes and internal surfaces wear over time, reducing vacuum output.
- Oil Contamination: Contaminated engine oil or carbon deposits accelerate wear and cause scoring.
- Seal Or Bearing Failure: Seals can leak and bearings can wear, leading to reduced performance or noise.
- Long Service Intervals Or Neglected Maintenance: Extended oil change intervals or use of incorrect oil can shorten pump life.
Replacement Interval
There is no strict mileage interval for vacuum pump replacement. In practice, pumps are commonly replaced when symptoms appear or during major engine work. Typical life expectancy varies with maintenance and driving conditions; many units remain serviceable beyond 100,000 km, while others may require replacement between approximately 120,000–200,000 km depending on usage and oil care.
Installation Recommendation
Replacement should be performed by a qualified mechanic or an experienced DIYer with adequate tools. General installation guidance:
- Park the vehicle on a level surface and follow basic safety procedures.
- Remove any engine covers, intake ducts, or accessory components that obstruct access to the pump.
- Inspect and, if required, replace sealing elements (O-rings/gaskets) and any retaining hardware.
- Observe correct torque settings for mounting bolts and ensure proper alignment of drive interfaces.
- After installation, check for vacuum leaks, secure hose connections, and verify normal brake operation before road use.
Recommended Workshop Practices
- Replace associated seals and hardware during installation to ensure a reliable repair.
- Inspect engine oil condition and change oil if contaminated, as poor oil quality accelerates pump wear.
- Test vacuum level and brake assist performance after fitting the new unit.
- Use OEM or equivalent quality parts and follow vehicle manufacturer procedures where available.
Additional Notes
This Bosch vacuum pump is a direct-fit solution for many PSA 1.6 diesel engines and is commonly sought under the listed product codes. It restores proper vacuum supply to braking and vacuum-controlled systems, contributing to vehicle safety and driveability.
