Mk3 Focus 355mm Big Brake Kit: Fitment & Power

When it comes to upgrading your Ford Focus Mk3, whether it's the potent ST250 or the formidable RS Mk3, one of the most impactful enhancements you can make is to its braking system. The question often arises: does a 355mm big brake kit fit a Mk3 Focus? The resounding answer is yes, it absolutely can, and with the right kit, you'll experience a transformation in stopping power that truly redefines your driving experience. This article delves into the specifics of fitting a high-performance 355mm brake kit, focusing on the impressive Pumaspeed Racing offering, and what you need to know to achieve ultimate braking confidence.

For any performance vehicle, the ability to shed speed quickly and consistently is as crucial as the power it generates. Stock braking systems, while adequate for daily driving, can often be overwhelmed under spirited driving conditions or on track days. This is where a big brake kit, such as the 355mm option, becomes indispensable. It’s not just about reducing stopping distances; it’s about enhanced fade resistance, superior modulation, and a significant boost in overall safety.

The Pumaspeed Racing 355mm Big Brake Kit: An Overview

Pumaspeed has engineered their Racing 355mm Big Brake Kit specifically for all Mk3 Focus models, including the ST250 and RS Mk3, to be a comprehensive, bolt-on solution. This kit is designed to provide 'monster' 355mm stopping power, directly addressing the limitations of factory brakes. It's a complete package, meaning everything required for installation is included, ensuring a straightforward upgrade process, though professional fitting is always recommended for such critical components.

Unpacking the Core Components

The Pumaspeed kit comprises several high-quality components, each meticulously designed to work in harmony for optimal performance:

• Lightweight 6-Piston Calipers: At the heart of this kit are the substantial 6-piston calipers. Unlike standard single or twin-piston calipers, these multi-piston units distribute braking force more evenly across the brake pad, leading to more consistent and powerful braking. Their lightweight design also contributes to reduced unsprung mass, which can subtly improve handling and suspension response. These calipers are embossed with the Pumaspeed logo, adding a touch of bespoke styling, and are available in a vibrant array of colours: Race Red, Nitrous Blue, Performance Orange, Ultimate Green, Bright Yellow, or Panther Black. This allows for significant personalisation to match or complement your vehicle's aesthetic.
• 355mm 2-Piece J-Hook Discs: The sheer size of these 355mm discs is a major contributor to the kit's stopping prowess. Larger discs provide a greater surface area for the brake pads to grip, increasing the leverage for braking torque. The discs are a 2-piece floating design, which helps manage thermal expansion more effectively, reducing the likelihood of disc warp under extreme heat. Furthermore, they feature a distinctive J-Hook groove pattern. This design is highly effective at dissipating heat and evacuating brake dust and gases, maintaining consistent braking performance even during prolonged, hard use. The discs are also Black Phosphate Coated, offering excellent protection against corrosion and enhancing their durability.
• Track Spec Brake Pads: The kit comes supplied with high-performance track-spec brake pads. However, Pumaspeed understands that different drivers have different needs. Consequently, a vast range of alternative pad compounds from leading manufacturers like Mintex and Ferodo are available. This flexibility allows you to tailor your braking performance precisely, whether your Focus is predominantly a road car, a dedicated track machine, or something in between.
• Full Fitting Kit: Crucially, the kit includes all necessary caliper mounting brackets and hardware, ensuring a direct fitment to your Mk3 Focus. This attention to detail simplifies the installation process, making it a truly comprehensive upgrade package.

Brake Pad Options and Their Applications

Choosing the right brake pad compound is vital for optimising your braking performance. The Pumaspeed kit offers a wide selection beyond the included track-spec pads:

It’s important to select pads that match your driving style and intended use to maximise the effectiveness of your big brake kit.

Crucial Fitment Considerations for Your Mk3 Focus

While the Pumaspeed Racing 355mm Big Brake Kit is designed for direct fitment on the Mk3 Focus, there are critical considerations regarding wheel clearance that must be addressed before purchase and installation. Ignoring these could lead to serious issues or render the kit unusable.

Minimum Wheel Size Requirement

The most fundamental requirement is that you will need 18-inch wheels as a minimum to accommodate the substantial 355mm discs and large 6-piston calipers. Attempting to fit this kit behind smaller wheels is simply not possible due to the physical dimensions of the components.

The Spacer Dilemma

Even with 18-inch wheels, clearance can still be an issue, particularly with stock Ford wheels. Pumaspeed explicitly states that most stock Ford wheels require 20mm spacers per side to ensure adequate clearance between the caliper and the inside of the wheel spokes. This is a crucial detail that cannot be overlooked. The precise clearance needed can vary slightly depending on the specific design and offset of your aftermarket wheels too. Pumaspeed offers their own high-quality spacers in 15mm or 20mm thicknesses, providing a convenient solution if you find your wheels require the additional clearance.

It is paramount to verify fitment before ordering, or certainly before attempting installation. Once the brake kit has been test fitted or fully installed, it typically cannot be returned. This underscores the importance of thorough checks and, if in doubt, consulting with technical advisors.

The Investment: Pricing and Value

A big brake kit is a significant investment in your vehicle's performance and safety. The Pumaspeed Racing 355mm Big Brake Kit, with an RRP of £989.00 (inc. VAT) and an 'Our Price' of £959.80 (inc. VAT), represents excellent value for the level of performance and engineering provided. For those who prefer a professional installation, a fully fitted option is available at £1,267.60 (inc. VAT).

Considering the components included – lightweight 6-pot calipers, 2-piece J-Hook discs, track-spec pads, and a full fitting kit – this price point offers a compelling argument for upgrading. When factoring in the enhanced safety, improved track performance, and the sheer confidence that superior braking provides, the investment becomes even more justified. The popularity of the kit, with 32 units already sold, further attests to its reputation and effectiveness among Focus enthusiasts.

Optional Enhancements

Beyond the core kit, there are optional extras to further fine-tune your setup:

• Additional Brake Pad Compounds: As detailed previously, a range of Mintex and Ferodo pads are available at an additional cost, allowing you to match your driving needs perfectly.
• Pumaspeed Spacers: If your wheels require them, 15mm or 20mm spacers are available for £78.00 (inc. VAT) per pair.
• Millers Motorsport Brake Fluid 320 PLUS: Upgrading your brake fluid is highly recommended when installing a big brake kit, especially for track use. This high-performance fluid offers a higher boiling point, crucial for maintaining pedal feel under extreme heat. A 2x 500ml pack is available for £44.40 (inc. VAT).

Frequently Asked Questions (FAQs)

Q1: Will this 355mm brake kit fit my specific Mk3 Focus model?

Yes, the Pumaspeed Racing 355mm Big Brake Kit is designed to fit all Mk3 Focus models, including the ST250 and RS Mk3. However, always double-check the wheel clearance requirements.

Q2: Do I need to buy new wheels to fit this kit?

You will need wheels that are a minimum of 18 inches in diameter. While your existing 18-inch wheels might fit, most stock Ford 18-inch wheels will require 20mm spacers to ensure adequate caliper clearance.

Q3: Are spacers always necessary?

Not always, but very often, especially with stock Ford wheels. It depends on the specific design and offset of your wheels. It's crucial to check your wheel clearance before fitting. Pumaspeed offers suitable spacers if needed.

Q4: What brake pads are included with the kit?

The kit comes supplied with track-spec brake pads. However, you have the option to upgrade or switch to various Mintex or Ferodo compounds to better suit your driving style (road, track, or race).

Q5: Is professional installation recommended?

For such a critical safety component, professional installation by a qualified mechanic or specialist is highly recommended. This ensures correct fitment, bleeding, and initial bedding-in procedures are followed, optimising performance and safety.

Q6: Can I return the kit if it doesn't fit?

Please note that these brake kits cannot be returned once test fitted or fully fitted to your car. It is absolutely essential to ensure fitment prior to ordering and attempting any installation. If you have any doubts, contact the supplier's technical advisors.

Q7: What are the benefits of 2-piece J-Hook discs?

2-piece discs offer better heat dissipation and reduce unsprung weight compared to single-piece discs. The J-Hook grooves help clean the pad surface, dissipate heat, and evacuate gases more effectively, leading to consistent braking performance and reduced fade.

Conclusion

Upgrading to a 355mm big brake kit on your Ford Focus Mk3 is a significant step towards unlocking its full performance potential and enhancing safety. The Pumaspeed Racing 355mm Big Brake Kit offers a comprehensive, high-performance solution, providing immense stopping power, superior heat management, and a wide range of customisation options for brake pads and caliper colours. While the initial question of fitment is a clear 'yes', it comes with the important caveat of requiring at least 18-inch wheels and, for most stock setups, the addition of spacers. By understanding these requirements and choosing the right setup, you can transform your Mk3 Focus into a vehicle with truly exceptional braking capabilities, giving you the confidence to push its limits on the road or track.

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