Buy Used and Reconditioned Brake Caliper parts at Breakeryard

What Is a Brake Caliper and What Does It Do?

The brake caliper is a key component of a vehicle’s disc braking system, designed to apply the necessary pressure that slows and stops your car. 

Positioned just behind the wheel and straddling the brake disc (rotor), the caliper houses the brake pads and a hydraulic piston that presses the pads against the disc when the brake pedal is engaged.

Whether it’s a front brake caliper or rear brake caliper, this part plays a vital role in converting hydraulic brake pressure into mechanical force, ensuring consistent and safe braking performance.

Some vehicles also feature a handbrake mechanism integrated into the rear caliper, while others use a separate drum brake within the disc hub.

Getting Into the Details of Brake Calipers

How Does a Brake Caliper Work?

When the brake pedal is pressed, brake fluid is forced through the hydraulic system into the caliper’s cylinder, pushing the piston(s) outward. This motion squeezes the brake pads against the rotating disc, generating friction that slows down or stops the wheel.

In vehicles where the handbrake (parking brake) uses the same caliper, a cable or motorised pushrod activates an additional mechanism inside the caliper to hold the pads in place without hydraulic pressure.

Types of Brake Calipers

There are several types of calipers used across different car makes and models:

• Floating calipers – the most common type, with one or two pistons on one side. The caliper moves slightly to apply even pressure on both sides of the disc.
• Fixed calipers – typically found on high-performance vehicles, these have pistons on both sides and remain stationary, offering more even and powerful braking.
• Electromechanical calipers – used in electric parking brake systems, especially in modern cars.
• Rear calipers with integrated handbrake – dual-function units used in many everyday cars.

What Are Brake Callipers Made Of?

Brake calipers are built to withstand high heat and repeated mechanical stress. Common materials include:

• Cast iron – durable and heavy, often used in rear brake calipers
• Aluminium alloy – lightweight and corrosion-resistant, used for front brake calipers or performance applications
• Stainless steel – sometimes used for pistons and hardware due to its resistance to rust

Quality callipers will include heat-resistant seals, corrosion-protected pistons, and durable slide pins or guide bolts.

Common Brake Caliper Issues

Although brake calipers typically outlast other brake components like pads and discs, they are still subject to wear, damage, or failure—especially in high-mileage or poorly maintained vehicles.

Signs of caliper failure include:

• Fluid leaks from the piston seal
• Seized pistons causing uneven braking or pulling to one side
• Reduced braking efficiency or increased stopping distance
• Vibrations, clunking noises, or dragging wheels
• Visual signs of rust, corrosion, or cracked housing

Neglecting a faulty caliper can lead to premature brake pad wear, reduced control, and even brake system failure.

When to Replace a Brake Caliper

Brake calipers should be inspected regularly, particularly if your vehicle shows any braking issues. Replacement is typically required if:

• The piston is seized or leaking
• The caliper is physically cracked, dented, or corroded
• Slide pins are seized and cannot be freed
• The handbrake function is no longer working properly
• You're upgrading your cars braking system for improved performance

While front calipers tend to wear out 2–3 times more frequently than rear ones, always check both when servicing your brakes.

Buying a Replacement Brake Caliper

When purchasing a replacement brake caliper, it’s essential to select a unit that matches the make, model, and year of your car. Many vehicles require vehicle-specific calipers, especially those with integrated parking brakes or unique mounting setups.

We stock genuine and OEM-compatible brake calipers for all major manufacturers.

Whether you're looking for a cheap rear brake caliper online, front brake calipers for top car models, or genuine manufacturer parts, our range offers excellent value and quality.