Understanding Race Brake Pads & Track Braking

Taking a car onto a racetrack puts very different demands on the braking system compared with normal road driving.

Choosing the correct brake setup isn't simply about fitting the most aggressive pad available. The brake pads, fluid, hoses, rotors, tyres, vehicle and driver all work together.

The goal is a braking system that remains strong, predictable and consistent as temperatures rise.

Race Pads vs Street Pads

Street brake pads are designed around everyday priorities such as:

• Low noise
• Low dust
• Good cold performance
• Long service life
• Comfortable pedal feel

Competition pads have different priorities.

They are designed to maintain consistent friction at temperatures where a normal street pad may begin to fade.

The trade-offs normally include more brake dust, more noise and increased pad and rotor wear.

That doesn't mean something is wrong with the pad. These are normal compromises when moving from a street compound to a motorsport friction material.

More Friction Isn't Always Better

Brake pads are often compared using their coefficient of friction, which helps describe how much braking torque the pad can generate.

Higher friction can provide stronger braking, but the highest number isn't automatically the best choice.

A good race pad needs enough friction for the vehicle while remaining predictable as temperatures change.

Similarly, strong initial bite does not necessarily mean an “on/off” brake pad.

Initial bite describes how strongly the brakes respond when the pedal is first applied.

Modulation describes how easily the driver can control braking force as pedal pressure is increased or released.

A race pad can therefore have very strong initial bite while still being smooth and controllable.

Temperature Is Everything

Repeated hard braking generates enormous amounts of heat.

If a brake pad exceeds its intended temperature range, friction can begin to fall away and the driver experiences brake fade.

However, automatically choosing the highest-temperature compound available isn't necessarily better either.

A lightweight car doing short Time Attack sessions may require a very different compound from a heavy, high-powered car completing long circuit sessions.

The driver matters too.

Two drivers in identical cars can generate very different brake temperatures depending on how late, hard and frequently they brake.

The objective is simple:

Use enough brake pad for the application, with an appropriate safety margin.

Brake Fluid Is Just as Important

Race pads are only one part of the equation.

The hydraulic system uses brake fluid to transmit pedal pressure to the calipers. As the brakes become extremely hot, that heat is eventually transferred into the caliper and brake fluid.

If the fluid becomes hot enough to boil, vapour can form inside the hydraulic system.

Unlike brake fluid, vapour is compressible.

The result can be a soft or sinking brake pedal even though the brake pads themselves may still be capable of working at that temperature.

This is why upgrading brake fluid is one of the most important preparations for a car that will see regular track use.

DOT 3, DOT 4 and DOT 5.1

The DOT rating establishes minimum performance requirements including boiling point and viscosity.

DOT 3
Common in many older and everyday road vehicles. Perfectly suitable when specified by the manufacturer, but conventional DOT 3 fluids generally offer less temperature capability than performance-oriented fluids.

DOT 4
Has higher minimum boiling-point requirements than DOT 3 and is extremely common in performance applications.

Many dedicated racing brake fluids are actually DOT 4 fluids with boiling points far beyond the minimum DOT 4 requirement.

DOT 5.1
Like DOT 3 and DOT 4, DOT 5.1 is normally glycol-based. It combines high boiling-point requirements with tighter low-temperature viscosity requirements, making it particularly useful in certain modern ABS and stability-control systems.

A higher DOT number therefore does not automatically mean a better racing fluid.

A high-quality racing DOT 4 can have a considerably higher boiling point than an ordinary DOT 5.1 fluid.

Important: DOT 5.1 should not be confused with DOT 5. DOT 5 is silicone-based and is a fundamentally different type of brake fluid.

Always use a fluid that is compatible with the vehicle's braking system.

Dry vs Wet Boiling Point

Performance brake fluids normally list both a dry and wet boiling point.

The dry boiling point represents fresh brake fluid.

The wet boiling point represents the fluid after it has absorbed moisture.

DOT 3, DOT 4 and DOT 5.1 fluids are hygroscopic, meaning they gradually absorb moisture from the atmosphere. As moisture content increases, the fluid's boiling point decreases.

For a track car, this means simply buying expensive racing fluid isn't enough.

Fluid condition matters too.

Vehicles subjected to repeated track use generally require more frequent brake-fluid changes or bleeding than ordinary road vehicles.

What About Stainless Steel Brake Lines?

Most production vehicles use flexible rubber brake hoses between the chassis and the moving brake caliper.

Under hydraulic pressure, these hoses can expand slightly.

Quality stainless-steel braided brake hoses use reinforcement around the flexible hose to reduce expansion.

The most noticeable benefit is normally a firmer and more consistent brake-pedal feel, particularly during repeated hard braking.

However, stainless lines should be understood correctly.

They do not magically increase the coefficient of friction of the brake pads or give the brakes more thermal capacity.

If the pads overheat, they can still fade.

If the brake fluid boils, the pedal can still become soft.

The braided line simply helps the hydraulic system transmit pedal pressure with less hose expansion.

Quality, correct fitment and proper routing are therefore much more important than simply buying a hose because it says “stainless steel.”

Brake Pad Materials & Brake Dust

Modern race pads can contain combinations of:

• Metallic materials
• Ceramic materials
• Carbon
• Fibres such as Kevlar
• Resins and friction modifiers

Because the formulations are different, not all brake dust behaves the same way.

Some competition compounds can produce hot metallic debris that becomes difficult to remove from wheels and, if allowed to remain, may stain or damage certain painted or coated finishes.

Other compounds may still produce significant visible dust but produce residue that is considerably easier to clean.

This is why the type of brake dust can matter just as much as the amount of dust produced.

Track wheels should always be cleaned regularly rather than allowing brake residue to remain on the finish.

What About Rotor Wear?

All race pads and rotors are consumable items.

However, high friction does not automatically mean extreme rotor wear.

Rotor wear is influenced by:

• Pad formulation
• Operating temperature
• Rotor material
• Vehicle weight
• Brake pressure
• Cooling
• Driving style

Two pads offering similar braking performance can therefore behave very differently in terms of rotor life.

Where G-LOC Fits In

G-LOC offers multiple competition compounds rather than one universal race pad.

Their motorsport friction materials use combinations of carbon, ceramic, Kevlar, metallic components and other friction modifiers, with different compounds intended for different levels of braking torque and temperature.

An R6, R10 and R16 are therefore not simply progressively “better” brake pads.

They are intended for different applications and levels of thermal demand.

G-LOC also places emphasis on characteristics such as modulation, smooth release, rotor friendliness and non-corrosive brake dust within its competition range.

Race compounds will still produce dust — sometimes a lot of it — but the behaviour of that dust can differ significantly between friction-material formulations.

For a breakdown of the individual compounds and their intended applications, see our G-LOC Brake Pad Compound Guide..

Front and Rear Compounds Don't Always Need to Match

The front brakes usually perform considerably more work than the rear brakes.

For that reason, fitting the same compound on all four wheels isn't always necessary.

Depending on the vehicle, a higher-torque front compound combined with a slightly lower rear compound can create a more balanced and controllable braking system.

Again, the objective isn't to install the most aggressive pad possible.

The objective is to build a balanced braking system that gives the car and driver the braking torque, temperature capacity and control they actually need.

The Bottom Line

Preparing a car for track use means looking at the braking system as a whole.

A good setup combines:

The correct race pad + suitable brake fluid + a healthy hydraulic system + good rotors + appropriate tyres.

Stainless-steel brake hoses can further improve pedal consistency and feel, while high-temperature brake fluid provides additional protection against fluid boiling during repeated heavy braking.

Race pads will naturally involve compromises in noise, dust and wear.

But describing every competition brake pad simply as “aggressive” doesn't tell the full story.

The best brake setup isn't necessarily the most extreme one available.

It's the one that continues to provide strong, predictable and consistent braking for the way the vehicle is actually being used.

For help selecting a G-LOC compound for your vehicle and intended use, contact DRL Performance Auto or view our G-LOC Brake Pad Compound Guide.