VTT E9/8X Rear Drag Brake Conversion Kit

Description

BMW E8X / E9X

VTT is proud to introduce our Ultimate Rear 15” Brake Conversion Kit for the E8X/E9X platform.

We took what already exists on the market and made it more complete, more performance-oriented, and purpose-built for drag applications — while maintaining clearance for 15” wheels.

This system replaces your factory rear rotor and single-piston caliper setup with lightweight VTT 4-piston calipers and 15” conversion rotors — dropping up to 20+ lbs of unsprung weight off the rear of the vehicle.

Less weight.
More clearance.
Improved weight transfer.
Better straight-line performance.

Fitment Notes

• Direct bolt-on for specified E8X/E9X chassis.

• Designed to clear many 15” wheel setups.

• We have confirmed fitment with Weld RTS 15×10 wheels.

• Due to wheel offset and design variations, we cannot guarantee clearance with every 15” wheel configuration.

Required Modification:
Rear brake dust shields must be removed for installation.

Calipers (with pads)

Factory Rear Caliper:
11.5 lbs each

VTT 4-Piston Caliper:
4.5 lbs each

✔ 7–7.5 lbs savings per side
✔ 14–15 lbs total savings (calipers alone)

Rotors

Factory Rotor:
18.2 lbs each

15” Slotted Conversion Rotor:
13.5 lbs each
✔ 4.7 lbs savings per side

15” Plain Conversion Rotor:
14.4 lbs each

✔ 9.4 lbs total savings (rotors vs factory, slotted option)

Total Rear Weight Comparison

Factory Rear Brakes:
~56 lbs total

VTT 15” Plain Rotor Setup:
37.3–37.8 lbs
✔ 18–19 lbs total savings

VTT 15” Slotted Setup:
35–36 lbs
✔ 20–21 lbs total savings

Important Disclaimer

This kit is designed for street use and drag racing only.

It is NOT designed for:

• Auto-X

• Road Racing

• Track use with repeated heavy braking

Always operate the vehicle within your limits.

Bedding Procedure – CRITICAL

Brake pads must be properly bedded to achieve full braking performance.

Failure to bed pads correctly may result in:

• 30–50% braking effectiveness

• Pad glazing

If glazing occurs:

• Remove rotors

• Sand pads

• Re-bed properly

Your kit includes a bedding instruction card. Follow it exactly.

What's Included

• (2) Rear Rotors

  • Plain: Centric 125 Series

  • Slotted: Genuine StopTech

• (2) VTT 4-Piston Rear Calipers

• (1) Set VTT High-Performance Brake Pads (Street or Race)

  • Optional: Order without pads to use your own compound

• All required hardware (brackets, bolts, adapter fittings)

• Optional Stainless Steel Rear Brake Lines

Pad compatibility:

• 4-Piston Dynapro Pad Style 7812

• 6-Piston Dynapro Pad Style 6712
  (Multiple aggressive compounds available from various manufacturers.)

Compatibility

Please make sure this part matches your vehicle before ordering.

Compatibility Check

To ensure the part(s) you have ordered fits your vehicle, we run a compatibility check prior to dispatch. We can do this either using your registration number (UK) or the last 7 digits of your VIN. Simply enter your car details prior to checkout.

Part Number

VTT-BRAKE-E9X

More Information

Manufactured by

VTT - Vargas Turbocharger Technologies