How Popular 4×4 Modifications Can Affect Braking Performance.

Bull bars, bigger tyres and suspension lifts can improve a 4WD’s touring ability, but Bendix says owners should also consider what those upgrades do to braking performance.

Australians love modifying their 4x4s. Whether it is for remote-area touring, towing, serious off-road work or simply giving the vehicle a tougher stance, many four-wheel drives on our roads have been upgraded well beyond their factory specification.

But while a well-chosen 4×4 modification can improve capability, load-carrying ability or off-road confidence, Bendix says owners should also think carefully about how these changes affect braking performance.

The reason is simple enough: every extra kilogram, every larger tyre and every change in ride height alters the way a vehicle behaves when it has to stop. That can mean longer stopping distances, extra brake wear and a greater workload for the brake pads, rotors, drums and other braking components.

Here are three common 4×4 modifications that can affect braking.

Bull bars

A steel bull bar is one of the most common additions to a touring 4×4, particularly for vehicles used in regional and remote areas where animal strikes are a real concern.

However, a steel bull bar can add around 60 to 80 kilograms to the very front of a vehicle. Add a winch, driving lights and other accessories, and that weight increases further.

That extra mass means the brakes have to work harder to slow the vehicle. The result can be increased stopping distances, along with greater wear and tear on brake pads and rotors.

It is not a reason to avoid fitting a bull bar where one is needed, but it is a reminder that adding weight to the front of a 4WD changes the braking equation.

Larger tyres

Larger tyres are often one of the first modifications owners make to a 4×4. They can improve ground clearance, allow the use of more aggressive tread patterns and give the vehicle better off-road ability in many conditions.

The trade-off is that larger tyres, particularly when matched with heavier wheels and aggressive tread patterns, add weight and increase rotational mass.

Rotational mass refers to the components that rotate with the wheel assembly, including tyres, wheels and wheel nuts. The further that mass sits from the centre of rotation, the more energy is needed to get it moving and, importantly, to slow it down again.

For braking, that can mean longer stopping distances and reduced durability from key braking components. In simple terms, the bigger and heavier the tyre and wheel package, the harder the brakes have to work.

Suspension lifts

Suspension lifts are another popular 4×4 modification, especially for owners who want to fit larger tyres without fouling the wheel arches or who need better clearance and articulation over rough terrain.

For touring and towing, a suspension lift can also help maintain a more level ride height, particularly when the vehicle is carrying accessories, camping gear, tools or payload. It can also reduce the risk of bottoming out on rough tracks.

However, extra ride height also raises the vehicle’s centre of gravity. That affects handling and braking, particularly during hard stops when weight transfers forward onto the front tyres.

Bendix says this increased weight transfer can contribute to longer stopping distances and increased brake wear, particularly on modified 4x4s that are also used for towing or long-distance touring.

Bendix braking solutions for modified 4x4s

To help address these issues, Bendix offers a wide range of braking upgrades for many popular four-wheel-drive models.

The company says its 4WD braking upgrade products are designed to restore, and in many cases exceed, original equipment braking performance, even on vehicles that have been modified with bull bars, larger tyres, suspension lifts and additional touring equipment.

Disc brake pads

Upgrading brake pads is one of the easiest and most affordable ways to improve 4×4 braking performance.

Bendix Ultimate 4WD™ Disc Brake Pads are engineered for extreme conditions and hardworking 4WD applications. They feature a high-tech ceramic formulation designed to provide low dust and low noise.

They also include Bendix’s Mechanical Retention System, known as MRS, which improves pad attachment strength.

Disc rotor and brake drum upgrades

A disc rotor or brake drum upgrade is the next logical step for owners looking to improve braking performance on a modified 4×4.

Bendix Ultimate 4WD™ Disc Brake Rotors use four-wheel-drive specific metallurgy, which is designed to increase rotor strength at elevated temperatures while also providing high wear resistance.

The rotors also feature high-efficiency cooling pillars that channel cool air into the rotor and expel hot air faster. This helps increase resistance to thermal cracking.

Additional performance comes from Bendix’s Diamond Tip Slot technology, which helps expel gases, dirt and water more efficiently from the rotor surface.

For vehicles fitted with rear drum brakes, Bendix also offers the Ultimate 4WD™ Brake Drum Upgrade Kit. This kit features High Carbon Metallurgy, SwiftFit protective zinc coating and an epoxy-coated hub, which Bendix says provide greater stopping power and improved durability.

Complete Bendix brake upgrade kits

For owners who want a more complete braking solution, Bendix offers upgrade kits that combine the benefits of several individual components with added convenience and cost effectiveness.

The Bendix Ultimate 4WD™ Brake Upgrade Kit includes brake pads, rotors, braided brake hoses, brake fluid, Ceramasil lubricant, rotor wipes and other components required for the upgrade.

For more demanding applications, Bendix also offers the Ultimate 4WD™ Big Brake Upgrade Kit. This is the company’s premium 4WD braking package and includes larger Diamond Tip Slot front rotors, powerful six-piston front calipers in the front kit, and a rear drum-to-disc conversion in the rear kit.

The Big Brake Upgrade Kit also includes Ultimate 4WD™ Brake Pads, braided brake hoses and the ancillary products found in the standard Ultimate 4WD™ Upgrade Kit.

Brake booster upgrade

For owners seeking even stronger braking performance, Bendix also offers its ADR-approved Ultimate 4WD™ Brake Booster Upgrade for selected models.

According to Bendix, the dual-diaphragm design can deliver up to 30 per cent greater stopping power by significantly reducing pedal effort.

Braking should be part of the modification plan

Bull bars, larger tyres, suspension lifts and touring accessories all have their place in building a more capable 4×4. But Bendix says owners should remember that these upgrades can affect braking performance and general vehicle dynamics.

For that reason, Bendix recommends using a reputable workshop when modifying a 4×4 and strongly considering suitable braking upgrades as part of the overall build.

After all, it is one thing to make a 4WD go further into the scrub. It is just as important to make sure it can stop properly when the track, traffic or wildlife suddenly has other ideas.