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 Mechanical Vacuum Pump Designed For Reliable Vacuum Supply To Brake Booster And Ancillary Systems. This vacuum pump is a direct-fit replacement for many Citroën and Peugeot diesel engines in the HDi/BlueHDi/e-HDi family. Ideal For Professional Garages And Skilled Do-It-Yourself Mechanics Searching By Part Number (9684786780, 456584). Restores Brake Assist Performance, Reduces Vacuum Leaks, And Helps Maintain Correct Operation Of Vacuum-Dependent Actuators.
Technical Information
- Manufacturer: Bosch
- Model: Citroën And Peugeot Vehicles With 1.4 HDi, 1.5 BlueHDi, 1.6 HDi, 1.6 BlueHDi And 1.6 e-HDi Engines
- Product Codes: 9684786780, 456584
- Additional Numbers: N/A
Function And Application
This is a mechanical vacuum pump used primarily to generate vacuum for the brake servo (brake booster) on diesel engines that do not produce sufficient intake vacuum at idle. The pump also supplies vacuum to various vacuum-operated components such as EGR/vacuum actuators and emission control devices. It Is Driven Mechanically By The Engine (Camshaft/Drive Gear) And Delivers Steady Vacuum Under Normal Operating Conditions.
Replacement Overview
Replacement Of The Vacuum Pump Is A Common Repair When Brake Assist Is Reduced Or When Vacuum Hoses Are Leaking. Typical Steps (Summary For Experienced Technicians):
- Disconnect Battery And Follow Manufacturer Safety Procedures.
- Remove Engine Covers And Any Obstructing Components (Air Intake, Heat Shields).
- Disconnect Vacuum Hoses And Any Electrical Connectors.
- Unbolt The Pump From Its Mounting; Replace Any O-Rings Or Gaskets.
- Install New Unit, Tighten Fasteners To Manufacturer Spec, Reconnect Hoses, Refit Covers.
- Start Engine, Check For Vacuum Leaks, Verify Brake Assist Function, And Perform Road Test.
Installation Recommendations
- Always Disconnect The Battery Before Starting Work And Observe Manufacturer Instructions To Avoid Damage.
- Replace Seal Rings Or Gaskets When Installing The New Pump To Ensure Leak-Free Operation.
- Inspect Vacuum Hoses And Connectors; Replace Cracked Or Hardened Hoses To Prevent Recurring Problems.
- Use Correct Fastener Torque Values From The Manufacturer; Avoid Over-Tightening.
- After Installation, Confirm Vacuum Level At Idle And Under Load; Verify Brake Booster Performance.
Why The Part Most Commonly Fails
Mechanical Vacuum Pumps Fail Most Frequently Due To Internal Wear And Contamination. Common Causes Include:
- Worn Internal Seals Or Vanes Resulting In Loss Of Vacuum.
- Oil Contamination Or Sludge Entering The Pump, Accelerating Wear.
- External Leaks From Damaged Vacuum Hoses Or Seals.
- Mechanical Damage To The Drive (Sprocket/Gear) Or Improper Installation.
Signs Of Failure
- Reduced Or Intermittent Brake Assist, Especially At Idle.
- Hissing Noises From The Engine Bay Or From Vacuum Lines.
- Visible Oil Leaks Around The Pump Or Its Mounting.
- Other Vacuum-Actuated Systems Operating Erratically.
Notes For Buyers
Search By Part Number (9684786780, 456584) To Find This Specific Unit Quickly. Suitable For Professional Installers And Experienced DIY Mechanics Who Need A Reliable Replacement Pump For Citroën And Peugeot Diesel Engines In The HDi/BlueHDi/e-HDi Range.
