Brembo 40mm Dust Boot - 20487246

The Brembo 40mm Dust Boot (Part # 20487246) is a genuine OEM-spec caliper dust boot designed for Brembo brake calipers equipped with 40mm pistons. Whether you're rebuilding a track-day caliper, replacing a heat-damaged boot on a high-performance street car, or restoring a set of Brembo brakes on a classic like a 2003 Nissan 350Z, this is the direct-replacement part that keeps your caliper pistons protected from dirt, moisture, and road debris. Sold individually, it's the exact component Brembo specifies for 40mm piston bore applications.

Key Features & Benefits

• Genuine Brembo Part: Manufactured to Brembo's own specifications under OEM part number 20487246, ensuring a precise fit in Brembo calipers designed for 40mm pistons — no fitment guesswork or aftermarket compromise.
• Protects Your Caliper Investment: The dust boot acts as the first line of defense for your caliper piston, sealing out road grime, moisture, and debris that can cause corrosion, piston seizure, or accelerated seal wear.
• Sold Individually: Buy exactly what you need — one boot per order — whether you're replacing a single damaged boot or stocking up for a full caliper rebuild.
• Hard-to-Find Replacement: Verified buyers have noted that this specific Brembo dust boot is difficult to source locally (not typically stocked at big-box auto parts stores), making direct-order availability especially valuable for a timely repair.
• Suitable for Street and Track Use: Brembo OEM-spec rebuild components are used by enthusiasts who track their vehicles and need to replace heat-damaged or worn boots as part of a proper caliper service.

Specifications

• Brand: Brembo
• Manufacturer Part Number (MPN): 20487246
• Piston Size: 40mm
• Part Type: Caliper Dust Boot (Hardware / Brake Caliper Rebuild Component)
• Condition: New
• Quantity: Sold individually (one boot per unit)

Fitment

This dust boot fits Brembo brake calipers with 40mm pistons. It is not vehicle-specific in the traditional sense — compatibility is determined by your caliper's piston diameter, not by year/make/model alone. Verified applications include Brembo calipers found on vehicles such as the 2003 Nissan 350Z (confirmed by a verified buyer). Because many different vehicles from various manufacturers use Brembo calipers with 40mm pistons across model years, the most reliable way to confirm fitment is to measure your caliper piston diameter before ordering. If your piston measures 40mm, this boot is the correct size.

Important Note: Dust boots and pressure seals are non-returnable once purchased. Please verify your piston measurement before placing your order. If you need help confirming fitment, contact ThreePiece.us before buying.

What's in the Box

• 1x Brembo 40mm Caliper Dust Boot (Part # 20487246)

Why Buy from ThreePiece.us

ThreePiece.us has served over 10,000 customers with expert fitment guidance across performance brake components, wheels, tires, and suspension. Our team is here to help you verify that this boot matches your specific Brembo caliper before you order — reach out via phone at 813-535-5801 or email at sales@threepiece.us.

• Free Shipping on every order — no minimum required.
• Affirm Financing available — split your purchase into manageable payments at checkout.
• Expert Fitment Support — real specialists who understand Brembo brake systems and can help confirm your caliper's piston size.
• In-Stock Availability — this item is a regularly stocked product, ready to ship.

Frequently Asked Questions

Q: How do I know if this dust boot fits my car?

A: Fitment is determined by your Brembo caliper's piston diameter, not by vehicle year or model alone. You need to physically measure your caliper piston — if it measures 40mm, this boot is the correct fit. Do not order based on vehicle make/model alone without verifying the piston size.

Q: Is this sold as a single boot or as a kit?

A: This listing is for one (1) individual dust boot. If you are servicing multiple pistons or both calipers on an axle, order the quantity you need.

Q: Can I return this boot if it doesn't fit?

A: Dust boots and pressure seals are non-returnable. This is an industry-standard policy for caliper sealing components. Please measure your pistons carefully and contact our team to confirm fitment before ordering.

Q: Is this a genuine Brembo part?

A: Yes. This is listed and sold as a new Brembo part under manufacturer part number 20487246, the same part number used across multiple Brembo-authorized sellers.