Description
Master Brake Cylinder BOSCH For Stellantis Vehicles. From A Vehicle With 33,000 Km Mileage.
This Bosch master brake cylinder is a direct-fit used replacement for a range of Stellantis group models. Intended for professional garages and skilled DIY mechanics, the unit restores reliable hydraulic pressure to the braking system and fits applications in Citroën, Peugeot, Opel and Fiat derivatives based on the same platform. The part is ideal when you experience pedal fade, internal leaks or contamination of the brake fluid that cannot be resolved by simple repairs. Keywords: Master Brake Cylinder, Bosch, Citroën Berlingo, Peugeot Partner, Peugeot Rifter, Opel Combo, Fiat Doblo, Brake System Replacement.
Function And Benefits
The master brake cylinder converts pedal force into hydraulic pressure that operates the calipers and wheel cylinders. A correctly functioning unit ensures a firm, consistent brake pedal feel and even braking distribution. This Bosch unit offers OEM-level hydraulics and compatibility with the Stellantis brake system architecture used on Berlingo/Partner/Rifter/Combo/Doblo platforms.
Typical Applications
- Citroën Berlingo III (K9)
- Peugeot Partner III
- Peugeot Rifter
- Opel Combo E (K9)
- Fiat Doblo III
How The Part Is Replaced
Replacement is straightforward for a trained technician. Typical steps:
- Park vehicle on level ground and secure it. Wear eye protection and gloves.
- Drain or siphon brake fluid from the reservoir to minimise spillage and contamination.
- Disconnect brake lines from the master cylinder using proper flare nut tools to avoid damaging fittings; cap lines to limit air ingress.
- Remove mounting bolts securing the master cylinder to the brake booster or bulkhead and extract the unit.
- Install the new master cylinder, tighten fasteners to the manufacturer’s torque specifications, and reconnect the brake lines.
- Refill the system with the correct brake fluid specification and perform a complete brake bleeding procedure (by hand, vacuum, pressure or manufacturer-recommended method) until no air remains in the circuits.
- Check for leaks, ensure pedal firmness, and road-test at low speed to verify proper operation.
Recommended Installation
- Use New Sealing Washers And Correct Flare Nut Tools To Avoid Line Damage.
- Always Replace Brake Fluid With The Manufacturer-Specified Type And Observe Correct Bleeding Sequence—ABS/ESP-equipped Vehicles May Require Special Bleeding Procedures.
- Inspect Brake Hoses, Calipers And Wheel Cylinders For Contamination Or Damage When Replacing The Master Cylinder.
- Prefer Installation By A Qualified Technician If You Are Not Experienced With Brake Systems.
Why The Part Most Commonly Fails
Master cylinders typically fail due to internal seal wear, contamination of brake fluid (moisture, debris), corrosion of internal bores, or damage from running the system with degraded fluid. Symptoms include a spongy or sinking brake pedal, external fluid leaks at the cylinder or lines, uneven braking, or illumination of brake-related warning lights. Harsh operating conditions, frequent exposure to moisture and failure to replace brake fluid at recommended intervals accelerate wear.
Technical Information
- Manufacturer: Bosch
- Model: Master Brake Cylinder For Stellantis Platforms
- Product Codes: 1616905480, 1638051480, 321372
- Additional Numbers: 1616905480 / 1638051480 / 321372
Signs That Replacement Is Needed
- Brake Pedal Feels Soft, Spongy Or Sinks To The Floor.
- Visible Brake Fluid Leak Around The Master Cylinder Or Brake Lines.
- Uneven Braking Or Increased Stopping Distances.
- Brake Warning Light Or ABS Faults Related To Hydraulic Pressure.
Service Life
Service life Depends On Vehicle Use And Maintenance. While Some Master Cylinders Last The Life Of The Vehicle, Contaminated Fluid Or Corrosive Conditions Can Cause Failures At Lower Mileages. Regular Brake Fluid Service And System Inspections Help Maximise Component Life.
Compatibility Note
Listed Applications Are Based On Common Stellantis Platform Fitments. Verify Fitment Against The Part Numbers Shown Before Installation.
