Description
Primary Brake Master Cylinder with Brake Fluid Reservoir for PEUGEOT 407 and CITROËN C5 X7
Overview
This replacement primary brake master cylinder with integrated brake fluid reservoir is designed for use on Peugeot 407 and Citroën C5 X7 models. It restores reliable hydraulic pressure generation for the braking system, ensures proper pedal feel and supports safe operation of ABS-equipped systems when installed and bled correctly. Commonly searched by OEM and reference numbers, the part is suitable for workshops and experienced DIY mechanics who maintain PSA group vehicles.
Key Features And Benefits
- Direct Fit For Peugeot 407 And Citroën C5 X7 — Simplifies Installation.
- Integrated Reservoir — Ready To Fill And Bleed, Minimizes Additional Assembly.
- Restores Firm Pedal Feel — Eliminates Spongy Or Sinking Brake Pedal Symptoms.
- OE Reference Numbers Included — Easier Identification And Searchability.
- Suitable For Professional And Competent DIY Installation — Saves Workshop Time.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Peugeot 407; Citroën C5 X7
- Product Codes: 9646980980, 4601Y7, 4635F7
- Additional Numbers: 9646980980, 4601Y7, 4635F7
- Brake Fluid Type: Typically DOT4 — Verify In Vehicle Manual Before Refill
Installation Recommendations
Follow safe workshop practice when replacing the master cylinder. Before starting, secure the vehicle on level ground and use appropriate support stands. Drain or siphon old brake fluid from the reservoir to reduce spillage. Disconnect brake lines carefully and cap them to prevent contamination. When fitting the new unit, tighten mounting bolts to the manufacturer’s specification and reconnect lines without twisting. After installation, perform a complete bleeding procedure for all circuits; ABS modules may require pressure or diagnostic-assisted bleeding to remove trapped air. Replace brake fluid with the correct specification and dispose of old fluid responsibly. Avoid spilling brake fluid on paintwork and wear appropriate protective equipment.
Why This Part Commonly Fails
- Seal Deterioration And Internal Wear — Over Time Seals Harden Or Leak Causing Pedal Softness Or Fluid Loss.
- Corrosion From Contaminated Or Moisture-Laden Brake Fluid — Water In Fluid Accelerates Internal Corrosion And Seal Damage.
- External Leakage — Faulty Connections Or Cracked Reservoir Can Lead To Visible Leaks.
- Contamination And Debris — Particles In The System Can Damage Seals And Pistons.
- Age And High Mileage — Components Wear With Time; Symptoms Often Appear As Increased Pedal Travel Or Reduced Braking Efficiency.
How To Replace
- Prepare Vehicle: Park On Level Surface, Chock Wheels, And Support Vehicle Securely If Needed.
- Remove Old Fluid: Siphon Brake Fluid From Reservoir To Minimize Spillage.
- Disconnect Brake Lines: Loosen Fittings And Immediately Cap Or Plug Lines To Prevent Air Ingress.
- Unbolt Unit: Remove Retaining Bolts And Extract Master Cylinder From Brake Booster Assembly.
- Install New Unit: Position New Cylinder, Secure Fasteners To Specified Torque, And Reconnect Brake Lines Cleanly.
- Refill And Bleed: Fill Reservoir With Correct Brake Fluid And Perform Full System Bleed. Use Diagnostic-Assisted Bleeding For ABS/EBD Systems If Required.
- Final Checks: Inspect For Leaks, Confirm Pedal Feel, And Test Drive Carefully At Low Speed To Verify Braking Performance.
Additional Notes
Replacement master cylinders are critical safety components. If the vehicle is equipped with an ABS unit, bleeding must remove all air from the system; some vehicles require specific procedures or diagnostic tools to cycle the ABS valves during bleeding. Always consult the vehicle repair manual for torque values and manufacturer-specific instructions. If in doubt, have installation and bleeding performed by a qualified technician.
