Brembo PISTA D-Bobbin Semi-Floating 8mm Flange 10 Hole Mounting Disc Hardware Pack - 915503

The Brembo PISTA D-Bobbin Semi-Floating 8mm Flange 10 Hole Mounting Disc Hardware Pack (Part # 915503 / SKU: BRB915503) is a genuine Brembo replacement and upgrade hardware kit designed for semi-floating brake disc assemblies that use a 10-hole mounting configuration with an 8mm flange bobbin. Whether you're rebuilding a track-day big brake kit, replacing worn or corroded bobbins, or completing a fresh brake disc installation, this hardware pack delivers the precision engineering Brembo is known for in motorsport and performance applications.

Key Features & Benefits

• Brembo PISTA Line Quality: The PISTA designation places this hardware firmly in Brembo's performance-oriented product family — hardware engineered to work in concert with high-performance semi-floating disc assemblies, giving you confidence on track or spirited road use.
• Semi-Floating Disc Compatibility: Designed specifically for semi-floating brake disc setups. Semi-floating discs allow the friction ring to move slightly relative to the hat/bell, reducing thermal stress, minimizing disc warping, and improving braking feel — but only when the bobbin hardware is correctly spec'd. Using the right hardware pack is essential to preserving that function.
• 8mm Flange Specification: The 8mm flange dimension is a critical fitment spec. Using incorrectly sized bobbins can compromise disc float, create unwanted play, or prevent proper disc seating. This pack is purpose-built for 8mm flange applications so you're not guessing at compatibility.
• 10-Hole Mounting Configuration: Matches brake disc assemblies with a 10-hole mounting pattern. If your disc or bell uses a 10-hole layout, this is the correct hardware pack — not the 12-hole variant (915515) or the 6mm flange 10-hole variant (915502).
• Direct Replacement / Rebuild Hardware: Ideal for anyone refreshing an existing Brembo semi-floating disc rather than replacing the entire rotor assembly, potentially saving significant cost while restoring proper disc function.
• Genuine Brembo Part: Sourced from Brembo with MPN 915503, ensuring dimensional accuracy and material quality consistent with the original disc assembly specifications.

Specifications

• Brand: Brembo
• Part Number (MPN): 915503
• SKU: BRB915503
• Bobbin Type: D-Bobbin
• Disc Float Type: Semi-Floating
• Flange Size: 8mm
• Hole Count / Mounting Pattern: 10-Hole

Fitment

This hardware pack is not vehicle-specific in the traditional sense — it is a brake disc hardware component that fits Brembo semi-floating disc assemblies requiring a 10-hole mounting pattern with an 8mm flange D-bobbin. To confirm this is the correct pack for your application, you'll need to verify:

• Your Brembo disc or big brake kit uses a 10-hole disc-to-bell mounting configuration
• Your existing bobbins or hardware spec calls for an 8mm flange
• Your disc uses a D-bobbin style (as opposed to other bobbin profiles)

Do NOT order this pack if: your disc assembly uses a 12-hole pattern (see Brembo 915515), a 6mm flange (see Brembo 915502), or a different bobbin profile. If you're unsure which hardware pack your Brembo disc requires, reach out to our fitment team before ordering — it's a quick verification that prevents a return.

Why Buy from ThreePiece.us

• Free Shipping: Every order ships free — no minimums, no thresholds, no surprises at checkout.
• Affirm Financing: Split your purchase into manageable payments through Affirm, so you can get the right parts without compromising your budget.
• Expert Fitment Support: Our team has served 10,000+ customers and specializes in helping enthusiasts source the correct parts. Call us at 813-535-5801 or email sales@threepiece.us — we'll help confirm this hardware pack matches your specific disc assembly before you buy.
• In-Stock Availability: This item is a regularly stocked product, not a special order, so you won't face extended lead times.

Frequently Asked Questions

Q: How do I know if this is the right Brembo hardware pack for my disc?

A: You need to match three things: the number of holes in your disc-to-bell mounting interface (this pack is for 10-hole setups), the flange size of the bobbin (this pack is 8mm), and the bobbin profile (this pack uses a D-bobbin). If you have your existing Brembo disc part number or big brake kit documentation, our team can help cross-reference it for you — just call 813-535-5801 or email us.

Q: Is this a full disc replacement or just the hardware?

A: This is a hardware pack only — it contains the D-bobbin semi-floating mounting hardware, not the brake disc, friction ring, or bell/hat. It's intended for rebuilding or refreshing an existing semi-floating disc assembly.

Q: What's the difference between this (915503) and the other Brembo PISTA hardware packs?

A: Brembo offers multiple PISTA hardware packs with different specifications. The 915503 is the 8mm flange, 10-hole version. The 915502 is a 6mm flange, 10-hole variant, and the 915515 is an 8mm flange, 12-hole variant. Always confirm your disc's specific requirements before selecting a pack, as these are not interchangeable.

Q: Does this ship free, and can I finance it?

A: Yes on both counts. ThreePiece.us offers free shipping on every order, and Affirm financing is available at checkout if you'd like to spread the cost over time.