3CX, 4CX
Selected models
The master cylinder is a key component that converts the force from the pedal into hydraulic pressure. In machines with a servo, its failure is indicated by the need to apply excessive force to the brake pedal, a delayed response, a "soft" pedal, or fluid leaks. This fault not only reduces comfort but also drastically increases stopping distance, posing a huge threat on the job site.
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Restored Braking Power
Firm pedal and immediate response
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Effortless Operation
Light and precise pedal feel
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Guaranteed Sealing
No leaks and stable pressure
A new cylinder working with the servo restores the light pedal feel, which reduces operator fatigue and increases braking precision.
High-quality internal seals prevent brake fluid leaks and ensure proper pressure is maintained in the system.
Designed as a direct replacement, ensuring a hassle-free and quick installation without any modifications.
This master cylinder is exclusively for machines with servo-assisted brakes. It will not fit older models without this system.
When replacing the cylinder, always use fresh, manufacturer-recommended brake fluid dedicated for JCB machines. Old fluid loses its properties and can damage the new cylinder.
After installing the new cylinder, the entire brake system must be thoroughly bled according to the service manual. This is crucial to achieve full braking power.
Answer: No, this model (15/920389) is exclusively for machines with a servo-assisted brake system. A different master cylinder is dedicated for non-servo machines.
Question: Why is my brake pedal still "soft" after replacing the cylinder?Answer: The most common cause is improper bleeding of the brake system. Another possibility is a leak further down the system (e.g., in the hoses or calipers).
If you are unsure whether the selected product is suitable for your machine, contact us and we will help you choose the right part and provide practical advice in minutes.
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JCB 3CX, 4CX

















