Description
Main Brake Cylinder BOSCH for CITROËN C4 and PEUGEOT 307, 308
High-quality Bosch Main Brake Cylinder designed for Citroën C4 and Peugeot 307/308 models. This direct-fit replacement restores firm pedal feel and safe braking performance. Suited for both professional workshops and competent DIY enthusiasts, the unit matches OEM fitment and mounting points for straightforward installation. Commonly sought by part number, this cylinder helps eliminate symptoms such as a spongy brake pedal, internal fluid leaks, or loss of hydraulic pressure.
Technical Information
- Manufacturer: Bosch
- Model: Citroën C4; Peugeot 307; Peugeot 308
- Product Codes: 0204254242, 4601R1, 4601T2, 4601V0
- Additional Numbers: 204254242, 4601V0
Function And Application
The master brake cylinder converts pedal force into hydraulic pressure for the brake calipers and wheel cylinders. It houses pistons and seals that push brake fluid through the brake lines when the pedal is depressed. This Bosch unit is intended as a replacement for vehicles originally equipped with the corresponding Bosch/OEM master cylinder on Citroën C4 and Peugeot 307/308 platforms.
Typical Symptoms Of Failure
- Spongy Or Sinking Brake Pedal: Increased pedal travel or gradual sinking under steady pressure indicates internal seal leakage.
- External Fluid Leaks: Fluid around the cylinder body, reservoir, or brake line connections.
- Brake Imbalance Or Dragging: Uneven braking or partial application when released, caused by internal faults or contamination.
- Warning Lights/ABS Related Issues: Air or contamination in the system may affect ABS modulation; follow correct bleeding procedures.
Why The Part Fails Most Often
Failures are usually caused by age-related wear of rubber seals, contamination of brake fluid (moisture, debris), corrosion of internal cylinder surfaces, or damage from improper bleeding and maintenance. Extended exposure to high temperatures and neglected fluid changes accelerate seal degradation and internal scoring.
Installation And Fitment
Removal And Replacement Tips:
- Secure The Vehicle And Work Safely: Park on level ground, use wheel chocks and jack stands where required.
- Drain Or Extract Brake Fluid From Reservoir To Minimize Spillage; Protect Paintwork From Fluid.
- Disconnect Brake Lines Using A Flare-Nut Wrench To Avoid Rounding Fittings; Cap Lines To Prevent Contamination.
- Unbolt The Master Cylinder From The Brake Booster/Mounting Bracket And Remove Carefully.
- Install New Unit, Reconnect Lines And Reservoir Hoses, And Tighten To Manufacturer Torque Specifications.
- Fill With Fresh DOT Brake Fluid Specified By Manufacturer (Typically DOT4 For These Models) And Perform Proper Bleeding.
Bleeding: Follow The Manufacturer’s Recommended Bleeding Sequence And Procedure, Especially On Vehicles With ABS/ESP. Improper Bleeding Can Leave Air Trapped In The System And Affect Braking Or ABS Performance.
Recommendation For Installation
- Always Use Fresh, Correct-Spec Brake Fluid And Replace Fluid If Contaminated.
- Inspect Brake Lines, Hoses, Calipers, And Wheel Cylinders While Replacing The Master Cylinder; Replace Damaged Components.
- Use New Sealing Washers Or Crush Washers Where Required And Torque Fasteners To OEM Values.
- After Installation, Test Brake Pedal Feel At Low Speed In A Safe Area Before Normal Driving.
Suitable For
Direct Fit For Citroën C4 And Peugeot 307 / 308 Models Equipped With The Corresponding Bosch Master Cylinder Part Numbers. Often Searched By Part Number For Fast Identification.
Why Choose This Unit
Bosch Quality Assurance, OEM-Compatible Fitment, And Durable Materials Make This Master Cylinder A Reliable Choice For Restoring Brake System Performance. Ideal For Garages And Skilled DIYers Looking For A Straightforward Replacement That Matches Original Specifications.
