VT Brake Booster Conversion including Master Cylinder – Suits Holden Commodore VB–VS

Serious stopping power for your early Commodore with the Lowe Fab VT Brake Booster Conversion

This Lowe Fabrication-developed kit converts your VB–VS Commodore to the later model VT–VZ style brake booster and master cylinder setup, improving braking feel, performance, and reliability.

Unlike old-school conversions that involve welding or modifying studs, this kit is bolt-in and engineer-friendly. We retain the integrity of the original genuine brake booster by modifying only the actuator rod — no hack jobs here. A professionally rebuilt and powedercoated brake booster is mated to a Lowe Fabrications billet adaptor bracket to correctly position your new upgraded booster and master in your early commodore engine bay.

At the heart of this kit is our patent-pending CNC-machined billet firewall bracket, designed in-house at Lowe Fab to ensure perfect fitment and long-term reliability for your VT Booster Conversion Kit including Master Cylinder Upgrade. Everything you need to perform the conversion is included — with optional brake line adapters available for early VB–VP vehicles.

The Lowe Fab VT Brake Booster Converison is perfect for when you’re upgrading the brakes on your early commodore to larger calipers, such as the Lowe Fab 2 Piston Front VT or 2 Piston Front VE Caliper Upgrade Kits!

Whats included?

✅ Fully reconditioned genuine brake booster – satin black powdercoat for factory look

✅ Brand new aftermarket (larger bore) brake master cylinder

✅ Lowe Fab CNC billet firewall mounting bracket (patent pending)

✅ Lowe Fab billet master cylinder to inner guard support bracket

✅ All required fasteners and hardware

Fitment Notes

The VT Brake Master Conversion Suits VB, VC, VH, VK, VL, VN, VP, VR, and VS Commodore models

If fitting to VR Series 2 or VS, do not use line adaptors

For new brake lines, we recommend flaring to suit the VT master cylinder instead of using adaptors

Please allow up to 8 weeks for dispatch due to custom assembly process

Why Upgrade with the VT Brake Booster Conversion?

The Low Fabrications VT Brake Booster Conversion has been designed to improve both brake pedal feel and travel when upgrading the brakes on your early Commodore. The original master cylinder doesn’t have enough internal volume to service the hydraulic needs of the larger, modern calipers and as such you will end up with an extrenely long pedal and have difficiculties stopping quickly.

The combination of the larger VT style master cylinder and brake booster offers the master cylinder volume you need to brake safely with the the appropriate pedal effort and feel! We have developed this kit to be a bolt on solution which facliitiates the modern caliper needs within the tight confined of the early commodore engine bay and firewall.

Why Choose Lowe Fab?

We don’t cut corners — we machine them. This kit combines OE-level engineering with real-world installer insight, delivering a kit that not only works better — but looks better too. Made by enthusiasts, for enthusiasts.