TRW Automotive AfterMarket DF4406 Brake Disc

TRW Automotive AfterMarket DF4406 Brake Disc

The TRW DF4406 is a high‑performance brake disc designed specifically for the rear axle of Mazda MX‑5 models, including the Mk II and Miata variants. It delivers reliable stopping power while maintaining durability under demanding driving conditions.

Key Features & Design Characteristics

• Diameter: 276 mm – a size that matches the original equipment for optimal fitment.
• Thickness: 10 mm – engineered to provide sufficient material for heat dissipation without adding excessive weight.
• Material Composition: High‑grade cast iron with a black finish, offering excellent thermal conductivity and resistance to corrosion.
• Ventilation: The disc features a single‑layer vented design that promotes airflow, reducing the risk of brake fade during prolonged use.
• Surface Finish: Smooth, factory‑polished surface ensures consistent contact with brake pads and reduces noise.
• Weight: Approximately 3.5 kg per disc – a balance between strength and lightweight construction for improved handling.

Compatibility & Fitment

The DF4406 is engineered to fit the following Mazda MX‑5 models:

• Mazda MX‑5 II (1998–2005)
• Mazda MX‑5 Mk II (2005–2015)
• All variants that use the standard rear brake assembly, including Miata II and Roadster II.

Installation requires the standard mounting hardware supplied with the vehicle. The disc’s dimensions match OEM specifications, ensuring a seamless fit without modification to the caliper or wheel hub.

Performance Benefits

• Consistent Stopping Power: The cast‑iron construction provides predictable braking performance across a wide range of temperatures.
• Heat Management: Ventilation channels allow heat to escape efficiently, reducing the likelihood of brake fade during spirited driving or heavy traffic.
• Durability: Resistant to wear and corrosion, the disc maintains its structural integrity over thousands of miles.
• Noise Reduction: The smooth surface finish minimizes squeal and chatter when paired with compatible brake pads.

Installation Guide

1. Remove the wheel: Use a lug wrench or impact driver to loosen the lug nuts, then lift the vehicle with a jack and secure it on jack stands.
2. Detach the brake caliper: Unbolt the caliper from the mounting bracket. Carefully slide the caliper away from the disc, supporting it with a wire hanger or caliper stand to avoid strain on the brake hose.
3. Remove the old disc: Unscrew the retaining bolts that secure the disc to the hub. Slide the disc off the wheel hub.
4. Install the DF4406: Place the new disc onto the hub, aligning it with the mounting holes. Re‑attach the retaining bolts and torque them to the manufacturer’s specification.
5. Reinstall the caliper: Position the caliper over the new disc and secure it with the original bolts. Ensure the brake hose is not kinked.
6. Check brake fluid level: Verify that the reservoir contains the correct amount of fluid, topping up if necessary.
7. Reattach the wheel: Place the wheel back onto the hub, hand‑tighten the lug nuts, lower the vehicle, and then torque the lug nuts in a star pattern to the specified value.

Maintenance Tips

• Brake Pad Inspection: Replace brake pads when pad wear indicators show contact with the disc surface. Worn pads can cause uneven wear or damage.
• Regular Cleaning: Use a non‑abrasive cleaner to remove brake dust and debris, preventing contamination of the braking system.
• Check for Surface Damage: Inspect the disc for cracks, scoring, or excessive glazing. Any irregularities may compromise braking performance.
• Avoid Overheating: During extended hard driving sessions, allow the brakes to cool between bursts of heavy use to prevent thermal stress on the disc.

Why Choose TRW DF4406?

The TRW DF4406 combines proven engineering with a design that respects the original specifications of Mazda MX‑5 models. Its cast‑iron construction, vented architecture, and precise dimensions make it an ideal choice for drivers seeking dependable braking without sacrificing performance or style.

Technical Specifications Summary

Final Thoughts

For Mazda MX‑5 owners who demand reliable, high‑quality braking components, the TRW DF4406 Brake Disc offers a blend of durability, performance, and ease of installation. Its design aligns with OEM standards while delivering the robustness required for spirited driving or everyday use.