Description
Bosch Master Brake Cylinder For Citroën C4, C4 II And Peugeot 307, 308
High-quality Bosch master brake cylinder designed as a direct replacement for a range of Citroën and Peugeot models. This unit restores correct hydraulic pressure to the braking system, improving pedal feel and stopping performance. Ideal for workshops and experienced DIYers looking for a reliable OEM-compatible replacement part. Common reference numbers associated with this unit are often used when searching for compatibility or ordering spare parts.
Technical Information
- Manufacturer: Bosch
- Model: Citroën C4, Citroën C4 II, Peugeot 307, Peugeot 308
- Product Codes: 0204254242
- Additional Numbers: 4601R1, 4601T2, 4601V1, 4601V0
Function And Benefits
The master brake cylinder converts driver pedal force into hydraulic pressure that is distributed to the wheel brakes. A correctly functioning master cylinder ensures a firm, predictable brake pedal, even pressure distribution to the ABS and calipers, and reliable brake system performance under different loads. Replacing a worn or leaking master cylinder restores braking response and safety.
How To Replace
- Park Vehicle On Level Surface And Secure With Wheel Chocks.
- Drain Or Extract Brake Fluid From The Reservoir To Reduce Spillage.
- Disconnect Brake Lines From Master Cylinder Carefully; Cap Lines To Prevent Air Ingress And Contamination.
- Remove Mounting Bolts Securing The Unit To The Brake Booster And Carefully Withdraw The Cylinder.
- Fit New Unit With New Sealing Washers/O-Rings Where Applicable And Reattach Brake Lines.
- Refill Brake Fluid Using The Manufacturer-Specified Type (Commonly DOT4) And Bleed The System Thoroughly, Starting From The Furthest Wheel.
- Check For Leaks, Verify Pedal Feel And Perform A Low-Speed Brake Test Before Normal Use.
Installation Recommendations
- Use New Copper Crush Washers Or Seals When Reconnecting Steel Brake Lines.
- Always Bleed The Brake System Completely After Installation To Remove Air And Prevent Soft Pedal.
- Use Brake Fluid Specified By The Vehicle Manufacturer (Commonly DOT4 For PSA Vehicles) And Replace Fluid If Contaminated Or Overdue.
- Torque Mounting Fasteners To Manufacturer Specifications; If Unsure, Refer To Service Manual.
- Wear Eye Protection And Gloves; Avoid Skin Contact With Brake Fluid. Dispose Of Used Fluid Responsibly.
Most Common Failure Causes
- Internal Seal Wear Causing Internal Or External Leaks And Loss Of Hydraulic Pressure.
- Contaminated Or Moisture-Laden Brake Fluid Leading To Corrosion And Seal Deterioration.
- External Damage Or Scoring Of The Piston Bore From Debris Or Corrosion.
- Age-Related Degradation Of Rubber Components Resulting In Intermittent Or Permanent Loss Of Performance.
- Symptoms Include Spongy Or Sinking Brake Pedal, Visible Fluid Leaks, And Illumination Of Brake Warning Lights.
Lifespan And Maintenance
There Is No Fixed Replacement Interval For The Master Cylinder; Lifespan Depends On Driving Conditions, Maintenance And Brake Fluid Care. Regular Brake Fluid Service (Typically Every 1–2 Years According To Many Manufacturers) Reduces The Risk Of Premature Failure. Replace The Master Cylinder Immediately If You Observe Leaks, Persistent Pedal Softness Or Reduced Braking Performance.
Compatibility
Designed For Use On Citroën C4, Citroën C4 II, Peugeot 307 And Peugeot 308 Models. Use The Product Codes Listed Above When Verifying Fitment With Parts Catalogues Or Workshop Databases.
Order This Bosch Master Brake Cylinder To Restore Safe, Predictable Braking Performance. Suitable For Professional Garages And Competent DIY Mechanics Who Follow Correct Safety And Bleeding Procedures.
