Description
Bosch Master Brake Cylinder For Citroën And Peugeot Vehicles
This used Bosch master brake cylinder (OE numbers 0204123596, 22472579, 4601L2) is a direct-fit replacement for a range of Citroën and Peugeot models. Designed for professional workshops and DIY mechanics, the unit restores reliable hydraulic pressure to the braking system, improves pedal feel and helps maintain safe stopping performance. Customers frequently find this part by searching the product codes 0204123596, 22472579 or 4601L2.
Technical Information
- Manufacturer: Bosch
- Model: Citroën, Peugeot (Examples: Citroën C4, Peugeot 307, Peugeot 308)
- Product Codes: 0204123596, 22472579, 4601L2
- Other Numbers: Stellantis
Compatibility
Compatible with selected Citroën and Peugeot vehicles using the above part numbers. Many technicians search by OE number when sourcing a replacement master cylinder. Ensure the part numbers match the unit removed from the vehicle to guarantee correct fitment and hydraulic connections.
How To Replace
- Park the vehicle on a level surface and secure it. Remove the engine cover or components as needed to access the brake master cylinder and reservoir.
- Drain or extract brake fluid from the reservoir to reduce spillage when disconnecting brake lines.
- Carefully disconnect the hydraulic lines from the master cylinder. Use appropriate line wrenches and be prepared to catch fluid—avoid introducing air or dirt into the system.
- Unbolt the master cylinder from the brake booster or mounting bracket and remove the unit from the vehicle.
- Bench-bleed the replacement master cylinder before installation to remove trapped air.
- Mount the master cylinder, reconnect hydraulic lines using new sealing washers if applicable, refill the reservoir with the correct specification DOT brake fluid and perform a full brake bleed (system bleed) to remove air from the circuit.
- Check for leaks and verify pedal firmness at low speed before returning the vehicle to service. Dispose of used brake fluid according to local regulations.
Installation Recommendations
- Always bench-bleed the new unit before installation to avoid prolonged bleeding on the vehicle.
- Use new copper crush washers or sealing rings on hydraulic fittings where required to prevent leaks.
- Keep all openings clean and protected from dust and moisture during the replacement process to prevent contamination of the brake system.
- Use the correct DOT-spec brake fluid as recommended by the vehicle manufacturer and complete a full hydraulic system bleed after installation.
- If the vehicle is equipped with ABS/ESP, follow the manufacturer’s bleeding procedure; some systems require a diagnostic tool to cycle the ABS pump during bleeding.
- If unsure about procedures or special steps for a specific model, have the replacement performed by a trained technician.
Why This Part Most Commonly Fails
- Seal Deterioration: Rubber seals and pistons wear over time, causing internal leaks and loss of pressure.
- Corrosion: Water-contaminated brake fluid accelerates internal corrosion and pitting of the bore.
- Contamination: Dirt or degraded fluid can score internal surfaces and damage sealing elements.
- Mechanical Damage: Impact or improper handling during service can deform ports or threads, causing leaks.
- Age And Maintenance: Master cylinders can last many years, but neglected fluid changes and harsh operating conditions shorten service life.
Search by part numbers 0204123596, 22472579 or 4601L2 to find this Bosch master brake cylinder quickly. Suitable for professional repair shops and experienced DIY mechanics who demand correct fit and reliable braking performance.
