VT Front Brake Upgrade for your Early Commodore! If you’re building an early Commodore—whether it’s a clean street car, tough cruiser, or something with serious power—brakes are one of the first areas that start to show their age.

The factory VB–VP setup was fine for its time… but compared to modern standards, it’s undersized, prone to fade, and lacks the confidence you want when the car starts making real power.

That’s exactly where the Lowe Fabrication VT–VZ brake upgrade comes in—and why it’s becoming popular again.

Why Upgrade Early Commodore Brakes?

Early Commodores (VB, VC, VH, VK, VL, VN, VP) share a similar limitation:

• Smaller rotor diameters
• Narrow pad surface area
• Ageing Single piston calipers
• Limited heat capacity

Once you start pushing the car—bigger wheels, more grip, more power—the braking system becomes the weak link.

The result:

• Longer stopping distances
• Brake fade under repeated use
• Poor pedal feel
• Reduced driver confidence

The VT Front Brake Upgrade to suit VB-VP Commodore Explained

The VT Commodore was released in 1999 by Holden and while there was a lot of commonality with the earlier Commodores, there was a lot that was new and improved. With a higher curb weight came a few upgrades such as the factory fitted twin piston front brake calipers and a step up to 296mm front rotors. This brake combination provided an improvement in braking performance and driver confidence even in larger and heavier VT vehicles and it wasn’t long before people were experimenting with caliper changes and realised the bolt spacing for the calipers was shared with the earlier cars. That’s where the parts bin special of the upgrade ended however as the rotor backspacing and hub-centric ID of the rotors didn’t make for a simple upgrade without custom parts.

Back when the VB Commodore was introduced in 1978 the front Macpherson front end featured a single piece strut including stub axle. The hubs were installed over fairly traditional wheel bearing setup and the hub dictated the back spacing of the rotor etc. To facilitate the fitment of VT specification rotors and calipers to the early VB-VP strut assemblies, a custom hub is required. The Lowe Fabrications VT Brake Conversion Hubs to suit VB-VP Commodore are the trick here being a high quality steel hub replacement which adapts and uses traditional VB-VP stub axle dimensions and bearings but honours the requirements, backspacing and dimensions of the VT-VZ brake setup allowing the use of Factory, or factory replacement VT-VZ Calipers and Rotors to the front of all VB through the VP Commodores. The VR and VS models are a slightly different architecture in the front so require a different solution – Lowe Fabrications also have the upgrade kit for these cars available aswell.

The last peice of the puzzle under the guard is the brake lines. The VT Commodore introduced a change on in the fittings for the front calipers meaning simply screwing your early original lines to the new VT Calipers was not an option. Lowe Fabrications again has the solution here with conversion lines which are designed to work with the early commodore hard lines on the car and adapt to the newer generation Twin Piston VT Calipers. As part of the Lowe Fabrications Front Brake Upgrade Kit Suit Commodore VB-VP, you’ll have all the gear to get your early girl back on the road.

The Fitment of VT-VZ Calipers onto the smaller and earlier VB-VP Commodores provides the hardware which performs far better and with greater consistency and driver feedback than any standard commodore before it. This change is also the preferred requirement of most engineers when converting early commodores to the LS platform as even the VT SS was factory fitted with the same twin caliper, 296mm rotors setup as featured on the V6 models. The only downside is you’re going to need to use a 15 inch wheel minimum to clear your new brakes.

The VT Booster Upgrade to suit VB-VP Commodore Explained

Now you have the bigger front calipers you’re good to go right? Sorry, you’re close but not quite there. Much of the improvement offered by the VT Twin Piston Calipers are those fairly large twin pistons spreading force over large pads and rotors. To move those pistons however you need more fluid and that is the first giveaway when you hit the brakes with your new front calipers fitted: A very long pedal. The reason is because even the largest master cylinder fitted to a pre VT commodore is still much smaller than the VT size and ability to move brake fluid and without the matching master cylinder, you need to push your foot further down the pedal to get the right amount of fluid onto the calipers to pull you up.

The solution, is the VT Specification Booster and Master Cylinder Conversion. With the increased bore size of the VT spec master cylinder there is more pedal effort required and the best way to offset this and get your brake pedal feeling right is to use the same sort of booster that is also fitted to the VT. Holden put a load of effort into making sure the pedal ratio, booster assist and master cylinder were right in ther new generation Commdore so there is no reason to reinvent the wheel – Just get with the program! Unfortunately, it just doesn’t fit!

Enter the Lowe Fabrications Brake Booster Conversion Kit including Billet Front and Rear Adapter Brackets – Designed to provide a direct bolt in upgrade to VT specification booster and master cylinder without any of the custom fabrication or guesswork previously required. These Kits allow the larger and VT Booster and Master Cylinder combo to be fitted to your early VB-VP Commodore with ease including the correct pedal ratio for driver feel, fluid capacity and stroke. Now you’re stopping better than any VT Commodore from your classic VB through to VP.

The VT Rear Brake Upgrade Explained

The Front of your Commodore does around 70-80% of your braking – Generally speaking the front brakes on a Holden Commodore do most of the work in physically stopping you and for good reason. They’re bigger and biased however the weight of the car will shift towards the front under braking forces and that also means less weight on the back, so you get away with less braking force as too much brake bias and you will lock your rear wheels due to the reduced axle weight with the dynamic weigh shift. It is this weight shift that will dictate the total amount of braking available to you.

But that’s not the only consideration…

Rear Caliper Piston Volume – With the increase in front piston volume moving to the new VT twin piston calipers and upgrade VT spec master cylinder you will be very close to having it just how the GM engineers intended. But not quite. If you want to nail the brake blance, you’re now looking at the rear brakes and don’t they just look underwhelming. In reality you’ve probably got 85-90% of the braking sorted but those last few percent is worth it! Ugrading the VT specification rear calipers means your master, front and rear caliper volumes along with pedal feel and brake bias are all spot on.

Looks can be everything – The other aspect of rear brakes you’ll quickly notice if you’re that way inclined is the underwhelming appearance of the factory early rears once you step back and appreciate the new VT spec fronts behind your wheels. The hub line is smaller as the early cars use a smaller handbrake shoe as are the the calipers and the rotors – All now small compated to the front. The solution? VT Rears.

The solution to getting VT Rear Brakes onto your early Commodore is the Lowe Fabrications conversion backing plates. These backing plates are a bolt on upgrade to your original backing plates and allow the rear rotors and calipers of a VT-VZ Commodore to be used on your VB-VP solid axle equipped Commodore. These backing plate kits include a change to the larger handbrake assembly to suit the VT – VZ rear rotors and brake new hand brake cables to suit. The brackets allow the fitment of VT rear calipers and rotors as a bolt on solution so you can have the entire bracking package matched and feeling like the GM Engineers intended.

VT Braking Architecture means any brake kits or component designed to suit the VT-VZ Commodore will also fit your VB-VP once you’ve fitted all the relevant conversion harware – So if you want something more substantial like the Harrop 4 Pot or even bigger muli piston brake setups which were more commonly available for the VT-VZ Commodores, these conversion parts will get your early VB-VP Commodore into the zone and open up a world of possibilities.