Vagbremtechnic Front Caliper Carrier Kit - Allows Fitment of Aston Martin DB9 or Reversed TTRS Calipers to OE 325mm or CSL 345mm discs - M3 E46

Transform your BMW E46 M3 front brakes with a precision adapter bracket solution that uses factory-size discs while accommodating high performance four piston callipers. This Vagbremtechnic setup enables a straightforward big brake conversion using Aston Martin DB9 calipers or reversed Audi TTRS 8J and RS3 8P units, all while retaining either OE 325 mm rotors or the CSL 345 mm disc option. Perfect for fast road and track day builds that demand dependable stopping power and sharp pedal feel.

Why choose this adapter bracket kit

• Aluminium carrier brackets with steel thread inserts and a durable black anodised finish for strength and corrosion resistance.
• Bespoke HEL Performance braided front hoses with stainless steel fittings and carbon black sheathing for a clean, OEM-plus install.
• High tensile M12x1.25 fixings paired with A2 stainless spring washers for secure mounting under hard use.

We have fitted this upgrade on customer cars and in our own builds with excellent results. Feedback has been consistently positive, especially for fast-road confidence and track consistency when paired with quality pads and fresh fluid.

Compatibility at a glance

• Vehicle: BMW E46 M3, front axle.
• Calipers: Aston Martin DB9 4 piston, or reversed Audi TTRS 8J and RS3 8P callipers.
• Discs: Standard 325 mm front rotors or E46 M3 CSL 345 mm discs.

Wheel clearance guidance

Factory 18 inch wheels require spacers:

• With 325 mm discs, minimum 16 mm per side.
• With 345 mm discs, minimum 12 mm per side. Check placement of wheel weights.

Included in the kit

• 2 x Base caliper carriers for 325 mm discs.
• 2 x Interlocking spacers for the 345 mm disc setup.
• 1 x Pair of HEL braided front brake lines, stainless fittings, carbon black sheath.
• 4 x 80 mm caliper-to-carrier bolts for 325 mm discs.
• 4 x 90 mm caliper-to-carrier bolts for 345 mm discs.
• 4 x A2 stainless spring washers for caliper-to-carrier bolts.

What else you will need to complete the conversion

• 2 x Aston Martin DB9 4 piston calipers, or reversed Audi TTRS 8J or RS3 8P calipers.
• 2 x Front discs in either 325 mm OE size or 345 mm CSL size.
• 1 x Set of front pads suited to your driving style and use case.
• Brake fluid for a full system flush during installation.

Important note on pad wear sensors

The OEM brake pad wear indicator cannot be used with this conversion. We recommend leaving the sensor plugged in to avoid a warning light, then safely securing the wiring out of the way.

Fitting and support

Professional installation is recommended. MJ Modifications in Warwickshire can supply and fit this upgrade, align clearances and bleed the system. For a fitting quote, email info@mjmodifications.co.uk.

Who is this brake upgrade for

Owners seeking a BMW E46 M3 big brake conversion that keeps OE rotor sizes while enabling a strong, reliable four piston calliper swap. Ideal for track days, spirited B-road driving and fast road builds where consistency and hardware quality matter.

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