Ford Focus Mk2 ST Brake Caliper Housing Front Left N/S 4N51-2B302-AC

Ford Focus Mk2 ST Brake Caliper Housing Front Left N/S is an original brake system component designed for the petrol version, ensuring stable pad guidance and reliable transfer of braking force to the disc. Thanks to the factory Ford design, this brake caliper with carrier guarantees a proper fit to the hub and steering knuckle, as well as correct operation with other system components.

Specifications and technical data

• SKU: 4N51-2B302-AC
• Mark: Ford
• Condition: Used
• OEM Part Number: 4N51-2B302-AC
• Substitutable numbers: 4N51-2B302-AC, 4N512B302AC, 1477830
• Location on the vehicle: Front, Left
• Fuel type: Petrol
• Part type: Brake Caliper
• Category: Calipers & Brackets

Purpose and vehicle placement

The presented caliper is designed for the front left side, which is crucial for the correct distribution of braking forces in a petrol-powered Ford Focus Mk2 ST. The design, adapted to the specific axle and side of the vehicle, allows for maintaining the correct system geometry, proper bleeding, and brake line routing in accordance with the manufacturer's design.

Being dedicated to the petrol version of the Focus ST means that the caliper's operating parameters – such as the working pressure range or the characteristics of interaction with the disc and pads – are matched to the performance of this model. This is important during dynamic driving, where the braking system operates at elevated temperatures and under higher loads.

Construction and function of the brake caliper

As an item from the Brake calipers and carriers category, this model is responsible for the precise guidance of the pads relative to the disc and their even pressure during braking. The caliper housing has been designed to:

• ensure stable mounting to the steering knuckle on the front left axle,
• maintain the correct position of the pads relative to the disc,
• enable efficient operation of the piston and guide elements,
• maintain adequate rigidity during repeated braking cycles.

Thanks to the factory Ford geometry, the caliper works with original discs and pads, which promotes even wear of the linings and predictable braking characteristics. This is particularly important in a car with a sporty character, such as the Focus Mk2 ST.

Benefits of using an original used caliper

Choosing a used, original brake caliper for the Ford Focus Mk2 ST is a solution that allows you to combine factory fitment with reasonable service costs. The OEM component maintains compliance with the manufacturer's design, which minimizes the risk of problems with installation, play, or incorrect alignment relative to the disc.

The main advantages of such a solution include:

• maintaining the original braking characteristics intended for the ST version,
• secure fit to the mounts on the front left axle,
• easier diagnostics and service thanks to the familiar Ford design,
• the possibility of economical brake system repair while retaining OEM components.

A used caliper can be a good choice for post-accident repairs, replacement after a seized piston, or during a comprehensive renovation of the braking system in a car used dynamically.

Professional selection and safety of use

To fully utilize the potential of this component, it is worth ensuring proper installation and checking the cooperating parts – discs, pads, and brake lines. When replacing the caliper, it is recommended to:

• check the condition of the disc and pads on the left and right sides to maintain braking symmetry,
• inspect the brake line for corrosion and cracks,
• thoroughly bleed the system after installation,
• verify the operation of the piston and guides after the first few kilometers.

For users who want to take a conscious approach to purchasing second-hand parts, a guide describing how to assess the condition of used brake components will be useful. Detailed tips can be found in the article Second-hand braking system: how to safely choose discs, calipers, and ABS?, where the process of selecting and checking such parts is discussed step by step.

Expanding the braking system in a Ford

If you are planning a comprehensive repair or upgrade of the braking zone in your Ford and need other elements from the same group, such as additional calipers, mounting carriers, or brackets, check the available parts in the Ford Brake calipers and carriers category.

By using original components from the same brand, you can maintain the structural consistency of the entire system, which translates into predictable car behavior during braking, both in everyday city driving and during more dynamic use characteristic of the ST version.