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This guide is for vehicle owners seeking reliable front brake replacement. The key benefit is enhanced braking performance and durability due to high-carbon, coated, vented discs meeting ECE-R90 standards. A caveat is the need to verify exact vehicle compatibility before purchase. This product includes a pair of 2x vented brake discs for the front axle, featuring a 300mm outer diameter, 28mm thickness, and a 5-bolt pattern. They are ECE-R90 certified and offer a high-carbon, coated finish for longevity.
| Model Part Number | 0986479D38 |
|---|---|
| Brand | Bosch |
While these discs meet ECE-R90 standards for road use and offer good heat management, they are primarily designed for everyday driving and moderate use. For dedicated track use, specialized high-temperature brake components may be required.
High-carbon discs generally offer improved thermal stability, meaning they resist heat-related wear and warping better than standard grey cast iron discs. They also tend to provide a more consistent friction coefficient and can reduce noise.
You must verify the exact specifications (outer diameter, thickness, bolt pattern, centering diameter) against your vehicle's requirements, often found in the owner's manual. Cross-reference part numbers with known brands like ATE, Brembo, or Delphi if your vehicle uses those.
It is highly recommended to replace brake pads whenever you replace brake discs. New pads paired with new discs ensure optimal performance and prevent premature wear or damage to the new components.
The ECE-R90 norm is a European regulation that certifies that aftermarket brake discs and pads meet or exceed the performance characteristics (like braking efficiency, fade resistance, and wear rate) of the original equipment parts.
The coating is primarily for protection during storage and transport. It will wear off during the initial bedding-in process and the first few applications of the brakes. Its main purpose is to prevent corrosion before installation.
This can be caused by uneven pad material transfer, heat spots, or warped discs. Ensure proper bedding-in procedure was followed. If persistent, check for disc runout and consider replacing discs and pads.
Often related to brake pads. Ensure correct pads are used and that they are compatible with the high-carbon discs. Check for debris or wear indicators on the pads. Replacement of pads may be necessary.
Check brake fluid level and condition. Inspect pads for wear. Ensure the discs are not glazed or excessively worn. Verify that the brake system is not leaking.
A light layer of surface rust on new, coated discs is normal before installation. This should be removed during the first few stops. Excessive or deep rust might indicate improper storage.
Compatibility Verification: Before installation, it is critical to verify that these brake discs (300mm outer diameter, 28mm thickness, 5x108mm bolt circle, 63.55mm centering diameter) are the correct fit for your specific vehicle's front axle. Consult your vehicle's owner manual or a professional mechanic, and use the provided cross-references (APEC, ATE, BENDIX, BREMBO, DELPHI, FERODO) to confirm.
Installation: Installation should always be performed by a qualified mechanic. This typically involves removing the front wheel, caliper, and old brake disc, then installing the new disc, ensuring it is properly seated. It is highly recommended to replace brake pads simultaneously and to have the brake system bled.
Bedding-In: After installation, a proper bedding-in procedure is essential for optimal performance and longevity. This usually involves a series of moderate stops from moderate speeds without coming to a complete halt, allowing the pads and discs to mate evenly. Consult your mechanic or the brake pad manufacturer's instructions for the specific bedding-in process.
Care: Keep the brake discs clean from excessive dirt and debris. Regular visual inspection for any signs of damage, warping, or excessive wear is recommended during routine maintenance checks.
