Description
Main Brake Master Cylinder BOSCH for Citroën C4 and Peugeot 307
High-quality BOSCH Master Brake Cylinder designed for Citroën C4 and Peugeot 307. This direct-fit replacement restores precise hydraulic pressure transfer from the brake pedal to the calipers and drum brakes, ensuring a firm pedal feel and reliable stopping performance. Commonly searched under part numbers 0204254242, 4601R1, 4601T2 and related references, this unit is aimed at professional technicians and experienced DIY mechanics who need a dependable, OEM-grade braking component.
Technical Information
- Manufacturer: BOSCH
- Model: Citroën C4; Peugeot 307
- Product Codes: 0204254242, 4601R1, 4601T2
- Additional Numbers: 4601V0
Function And Benefits
The Master Brake Cylinder Converts Mechanical Force From The Brake Pedal Into Hydraulic Pressure That Operates The Brake Calipers And Wheel Cylinders. Key Benefits Include:
- Restores Correct Pedal Feel And Brake Response
- Precision-Machined Bore And Durable Seals For Long Service Life
- Direct Fit For Fast Replacement And Minimal Adjustment
- Compatible With Standard PSA Brake Systems Used On The Listed Models
Fitment And Replacement Overview
This Master Cylinder Fits Citroën C4 And Peugeot 307 Models Specified By The Above Codes. Typical Replacement Procedure:
- Park Vehicle On Level Ground And Securely Support It.
- Drain Or Siphon Brake Fluid From The Reservoir To Reduce Spillage.
- Disconnect Brake Lines From The Master Cylinder; Cap Lines To Prevent Contamination.
- Unbolt The Unit From The Brake Booster And Remove From The Vehicle.
- Install New Unit, Reattach Brake Lines, And Torque Fasteners To Manufacturer Specifications.
- Bench-Bleed The New Master Cylinder Before Installation To Remove Internal Air.
- After Installation, Fully Bleed The Brake System Wheel-By-Wheel Until No Air Remains; If Vehicle Has ABS, Follow The Manufacturer Bleeding Procedure.
- Top Up With Manufacturer-Specified Brake Fluid (Many PSA Models Use DOT4) And Check For Leaks.
Installation Recommendations
- Always Bench-Bleed The New Master Cylinder To Prevent Air Entrapment.
- Avoid Contaminating Brake Fluid; Use Clean Containers And Tools.
- Replace Rubber Hoses Or Seals Showing Wear To Ensure A Reliable Repair.
- Do Not Reuse Old Brake Fluid; Dispose Of Contaminated Fluid Properly.
- If The Vehicle Has ABS/ESP, Use A Scan Tool Or Follow The OEM Bleeding Sequence To Ensure Proper System Operation.
- If Unsure About Specific Torque Values Or Bleeding Procedures, Consult The Vehicle Repair Manual Or A Professional Workshop.
Why This Part Fails Most Often
- Seal Degradation Due To Age Or Contaminated Brake Fluid Leading To Internal Leaks And A Spongy Pedal.
- Corrosion Of The Bore From Moisture In Old Or Poor-Quality Brake Fluid.
- External Leaks At Line Connections Caused By Loose Fittings Or Damaged Sealing Surfaces.
- Mechanical Wear From High-Mileage Use Or Repeated Overheating Of The Brake System.
- Failure To Replace Associated Components (Hoses, Brake Booster) When Needed, Which Can Mask Or Accelerate Master Cylinder Wear.
Final Notes
When replacing the master cylinder on Citroën C4 or Peugeot 307 models, use the part numbers above to confirm fitment. Proper bench-bleeding and system bleeding are essential for safe operation. This BOSCH unit offers a reliable solution for restoring braking performance when symptoms such as a soft pedal, internal leaks, or loss of stopping efficiency appear.
