BTCC Brakes Rotor 368mm x 36mm with Bobbins replacement kit XC3 Engineering

Ex-BTCC 368mm x 36mm Brake Rotor & AP Racing Bobbin Replacement Kit

Refresh your compatible BTCC-style braking setup with this complete replacement package, combining two lightly used ex-BTCC 368mm x 36mm brake rotors with two sets of AP Racing floating disc bobbins.

Designed for vehicles already running compatible 368x36mm ex-BTCC rotor setups, this kit provides the key consumable components needed for a rotor change in one package — saving time sourcing rotors and replacement bobbin hardware separately.

The rotors are sourced directly from current BTCC teams and offer a highly cost-effective replacement option for track-day, clubsport and motorsport braking systems.

Why choose the complete replacement kit?

One of the biggest advantages of this package is convenience.

Rather than sourcing used BTCC rotors and the correct floating disc hardware separately, the kit combines both into one replacement solution.

This is particularly useful for track-focused cars where brake consumables are replaced more frequently and reliable access to the correct hardware is important.

The package includes:

• 2x lightly used ex-BTCC 368mm x 36mm brake rotors
• 2x sets of AP Racing floating disc bobbins

For compatible setups, this provides the main components required to refresh both front rotor assemblies.

Genuine Ex-BTCC 368mm x 36mm Rotors

The brake rotors are sourced directly from current British Touring Car Championship teams.

These are used motorsport components and will show signs of previous heat cycles and competition use.

Each pair is supplied in lightly used, serviceable condition and provides a cost-effective alternative to purchasing equivalent new motorsport friction rings.

For cars that consume brake rotors regularly through track use, this can significantly reduce ongoing maintenance costs.

368mm x 36mm Motorsport Specification

The large 368mm diameter and 36mm thickness make these rotors well suited to demanding high-performance braking applications.

Their substantial size provides:

• Large braking surface area
• High thermal capacity
• Increased resistance to repeated heat loading
• Suitability for powerful track cars
• Compatibility with selected AP Racing CP9660-based brake systems

This rotor specification is used within several XC3 Engineering BTCC big brake kit applications.

AP Racing Floating Disc Bobbins Included

The kit includes two complete sets of AP Racing floating disc bobbins.

The bobbins connect the rotor friction ring to the separate alloy bell while allowing a controlled degree of movement between the two components.

This floating arrangement allows the rotor to expand as temperatures increase under heavy braking, helping manage the stresses generated by repeated heating and cooling cycles.

Why Replace the Bobbins?

For track-focused vehicles, replacing the bobbins at the same time as the brake rotors is recommended.

The bobbin hardware is subjected to:

• Repeated high temperatures
• Thermal expansion and contraction
• Heavy braking loads
• Multiple heat cycles
• Mechanical movement between the rotor and bell

Over time, these stresses can contribute to wear in the floating hardware.

Installing fresh bobbins alongside replacement rotors gives the disc assembly new hardware at the same time as the friction rings are renewed.

Road Cars & Bobbin Reuse

Vehicles that see predominantly road use and relatively little track driving may be able to reuse existing bobbins depending on their condition.

However, this should be assessed by the installer or vehicle owner.

Reusing existing bobbins is ultimately at the user's discretion, and all components should be inspected carefully before being returned to service.

For heavily tracked vehicles, replacing the bobbins during each rotor change is the preferred approach.

Cost-Effective Motorsport Brake Maintenance

One of the key benefits of the ex-BTCC rotor system is replacement cost.

Motorsport brake consumables can become expensive, particularly on powerful cars running high-grip tyres and frequent circuit sessions.

Using lightly used BTCC rotors provides access to genuine high-performance braking hardware at a fraction of the price of equivalent new friction rings.

Combining the rotors with new AP Racing bobbin hardware makes this kit a convenient maintenance solution for compatible brake conversions.

Save Time Sourcing Replacement Components

Finding the correct motorsport brake components individually can be time consuming.

This package brings together the main replacement parts required for a compatible 368x36mm floating disc setup.

Instead of separately sourcing:

• Replacement rotors
• Correct bobbins
• Compatible floating hardware

the kit provides everything together in one place.

For track-day and motorsport customers, this can make routine brake servicing significantly simpler.

Compatible XC3 Engineering Big Brake Kits

These replacement rotors and bobbins are used with compatible XC3 Engineering BTCC Big Brake Kits, including applications for:

BMW M3 E9X – Compatible with applicable XC3 Engineering BTCC Big Brake Kits for the E90/E92 M3 platform.

BMW M2 / M3 / M4 F8X – Compatible with applicable XC3 Engineering BTCC Big Brake Kits for the F80 M3, F82/F83 M4 and F87 M2 platforms.

Please confirm the exact brake kit specification before ordering.

Compatibility

This replacement kit is intended for vehicles already using compatible ex-BTCC 368mm x 36mm floating brake rotor assemblies.

Compatibility depends on factors including:

• Rotor diameter and thickness
• Rotor bell design
• Bobbin specification
• Caliper position
• Pad annulus
• Existing brake kit configuration

A vehicle using a 368mm brake disc does not automatically mean these friction rings will fit.

If you're unsure whether this kit is compatible with your current setup, please contact us before ordering.

Used Motorsport Rotor Information

Please be aware that the supplied brake rotors are used ex-BTCC components.

They have previously been used in motorsport and will therefore show signs of heat cycling, surface marking and normal competition use.

The exact cosmetic appearance of each pair may vary.

These should not be expected to arrive with the appearance of brand-new brake discs.

The main benefit is access to usable motorsport friction rings at a significantly reduced replacement cost.

Ideal for Track & Motorsport Builds

This replacement kit is particularly well suited to:

• XC3 Engineering BTCC Big Brake Kits
• AP Racing CP9660-based braking systems
• Track-day cars
• Clubsport builds
• Time Attack cars
• Motorsport vehicles
• High-powered performance cars
• Cars running semi-slick or slick tyres
• Drivers looking to reduce ongoing brake consumable costs

Professional Installation

Professional installation is recommended.

The brake rotor assembly should be correctly built using the replacement bobbins and existing compatible rotor bells.

Installation should include:

• Inspection of the rotor bells
• Inspection of mounting hardware
• Correct bobbin installation
• Correct torque procedures
• Rotor runout checks where appropriate
• Brake pad inspection
• Final braking system inspection

Braking components are safety-critical and should only be installed by a competent technician.

Kit Contents

This complete replacement package includes:

• 2x lightly used ex-BTCC 368mm x 36mm brake rotors
• 2x sets of AP Racing floating disc bobbins

Rotor bells, calipers, brake pads and other brake system components are not included unless specifically stated.

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