Upgrade your E46 M3 brakes

We offer the E46 M3 Megane RS Trophy-R BBK retrofit kit as a brake upgrade for your S54. The kit features large pistons, stainless steel lines, custom caliper bracket, brake pad hardware, and all other hardware necessary for the kit install. The kit uses OEM Competition/CSL/ZCP 345×28 rotors. Rotors and pads are not included with this kit, but they are very common.

If you need help selecting brake fluid, please take a look at our Ultimate Brake Fluid Comparison Guide where we have a table sorted by boiling points. The higher the better.

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Megane RS Trophy-R

For E46 M3

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Parts List

  • (2) Brembo Megane RS Trophy-R Calipers
  • (2) Buildjournal Caliper Adapters + Hardware
  • (2) Porterfield Custom Stainless Steel Brake Lines
  • (2) Brake Pad Hardware
  • (1) Loctite 263 Threadlocker

Supporting Parts List

Tools Required

  • 5mm hex
  • 10mm hex
  • 12mm hex
  • 11m wrench (brake line)
  • 14mm socket
  • 16mm socket
  • 17mm socket
  • 16mm wrench
  • Torque Wrench
  • Angle grinder/Dremel
  • Safety googles
  • Hammer
  • Jack + Stands





BBK Retrofit Install Directions

Disclaimer: This DIY does require you to lift your car so please use proper tools and follow all safety procedures if you choose to attempt. This guide is for your reference only. We are not liable for any damages or injuries that result from this guide.

1. Jack up the fronts and remove your front wheels.

2. Remove OEM calipers

2.1 Remove the brake line rubber grommet and brake line wire sensor. Take note of the factory line/wire routing.

2.2 Remove the two 16mm bolts that attaches the caliper to the spindle.

2.3 Suspend or place the caliper so that there is no tension on the brake line. Do not remove your OEM brake line from the hard line just yet.

3. Remove OEM rotor

3.1 Use a 5mm hex to remove the two caliper retaining bolts. It is highly recommended to use new bolts. They’re super easy to strip and they’re cheap enough. See below for part links.

Tip: It might be easier to remove caliper if you loosen the 5mm hex bolts first before you remove the calipers, step 2.

OEM Rotor Screw – 34111123072

OEM Rotor Screw (Stainless Steel) – ES#2550873

4. Trim OEM heat shield

4.1 Use a dremel or cutter to trim a few inches to make clearance for the caliper bracket and caliper.

5. Install caliper bracket

5.1 Apply a small amount of Loctite to the bottom of the (silver) bolt threads and install the caliper bracket to the knuckle. Make sure to use supplied washer.

5.2 Torque to 50 ft lbs using a 10mm hex.

6. Install new rotor

6.1 It is recommend to clean hub with wire brush before putting the new rotor on.

6.2 Install the two 5mm hex bolts to secure rotor to hub.

7. Install brake line on back of caliper

7.1 Make sure you use two crush washers (supplied) on each end of the banjo fitting. Torque to 15 ft lbs using a 14mm socket.

8. Remove OEM brake line using 11mm wrench

8.1 Get ready to swap brake lines with the new stainless steel fitting. Grab a towel to catch the brake fluid from dripping on the ground. Some very important things to note here:

  • The new stainless steel lines come with an adapter fitting so you must tighten both.
  • Once the new line is installed, make sure the hard line is not touching anything.
  • Lastly make sure you're not sandwiching the OEM brake line holder bracket with the fittings.

Optional: If you want to keep the brake line connection factory-style, you can bore out the factory star pattern slot that holds the OEM brake line. You can then slot the new stainless steel line through the bottom side of the factory bracket and use the OEM metal retainer clip to hold the line in place.

9. Install the two (black) bolts to the caliper and bracket

9.1 Use a little bit of Loctite on the bottom of the threads and torque to 50 ft lbs using a 12mm hex. Make sure to use supplied washer. Caliper bleeder nipples should be facing upwards.

9.2 Install new brake line grommet to factory bracket. Follow same brake line routing as factory.

10. Install brake pads

11. Install brake pad retainer clip and pins

12. You’re done! Repeat for other side and check for immediate brake fluid leaks.

12.1 Now you need to bleed your brake system. Please follow proper procedure to bleed calipers. Zeckhausen Racing has a good brake bleed article.

12.2 Follow brake pad break-in procedure if necessary.

12.3 Monitor your brake system for the next few days and check for any leaks, line contact, etc.

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