02/12/2011
When it comes to vehicle safety, few components are as critical as the braking system. It's the unsung hero that ensures your car can stop reliably, whether you're navigating urban traffic or cruising on the motorway. Understanding how your brakes work, what their key components are, and how to maintain them is paramount for every driver. This article will delve into two crucial parts of your braking system: brake pads and brake calipers, shedding light on specific brands like HPS and Lockheed, and offering a wealth of information to keep you safe on the road.
The Heart of Stopping: Brake Pads Explained
Brake pads are the friction material that presses against the brake disc (rotor) to slow down or stop your vehicle. They convert kinetic energy into thermal energy through friction, a process that is vital for deceleration. Over time, this friction wears down the pads, necessitating their replacement.
What Are HPS Brake Pads?
When discussing brake pads, especially for those seeking enhanced performance without stepping into full-blown race pads, the term HPS often comes up. HPS stands for High Performance Street. These pads are designed to offer a significant upgrade over standard original equipment (OE) pads for daily driving and spirited street use. While there might not be groundbreaking 'new' developments annually, the HPS line from various manufacturers continually refines its compounds to deliver a balance of performance characteristics.
Typically, HPS pads feature a unique friction material compound that provides a higher coefficient of friction than standard pads, leading to better initial bite and more consistent performance across a wider temperature range. They are engineered to offer improved stopping power, reduced brake fade under demanding conditions, and often lower dust production compared to more aggressive track pads. For the enthusiast who enjoys a dynamic driving experience but still uses their car for daily commutes, HPS pads are an excellent choice, offering a noticeable improvement in braking feel and confidence without excessive noise or rotor wear.
Types of Brake Pad Compounds
Beyond HPS, brake pads come in various compounds, each with distinct characteristics:
- Organic Non-Asbestos (NAO) Pads: These are the quietest and produce the least dust. They are common on older vehicles or for light-duty applications. They offer good cold bite but can suffer from fade under heavy braking.
- Semi-Metallic Pads: Containing 30-65% metals like copper, iron, steel, and brass, these pads offer better heat transfer and stopping power than organic pads. They are durable but can be noisier and produce more dust.
- Ceramic Pads: Composed of ceramic fibres, fillers, and bonding agents, ceramic pads are known for their quiet operation, low dust, and excellent performance across a wide range of temperatures. They are often a premium choice, offering a good balance of performance and comfort.
- Low-Metallic NAO Pads: A hybrid approach, these pads contain a smaller amount of metal than semi-metallic, aiming to combine the best of both worlds – improved performance over organic with less noise and dust than full metallics.
Choosing the right brake pad depends heavily on your driving style, vehicle type, and budget. For general street use, a good quality ceramic or HPS-style pad often provides the best balance.
The Gripping Force: Brake Calipers Demystified
If brake pads are the 'muscle' of your braking system, then brake calipers are the 'hands' that apply that force. The caliper houses the brake pads and pistons. When you press the brake pedal, hydraulic pressure from the master cylinder forces the pistons to extend, pushing the brake pads against the rotor to create friction and slow the vehicle.
Understanding Lockheed Brake Calipers
Lockheed is a name synonymous with braking, particularly in the realm of classic and performance vehicles. With a rich history, Lockheed brakes have been a staple in automotive and motorsport applications for decades, renowned for their quality and reliability. While the specific price for a complete new Lockheed brake caliper assembly was not provided in the information given, we can look at the cost of genuine Lockheed brake components.
For instance, a Lockheed caliper Seal kit (Part #: 0795.39.805) is priced at $51.95. This kit is crucial for rebuilding and maintaining the integrity of an existing caliper, ensuring the pistons move freely and hydraulic fluid remains contained. Additionally, a Nut - Lockheed M/C For Switch (Part #: 0795.54.337) costs $24.97, and Pads - Scarab & Lockheed - EBC Organic (Part #: 0795.39.409) are available for $34.79. These prices indicate the availability of specific, high-quality replacement parts for Lockheed systems, rather than the cost of a complete new caliper unit.
The fact that individual seal kits and specific nuts are readily available speaks to the longevity and serviceability of Lockheed calipers. Many enthusiasts and classic car owners prefer to rebuild original Lockheed calipers due to their robust design and historical significance, rather than replacing them with generic alternatives. The brand's legacy is built on precision engineering and dependable performance, making them a sought-after component for restoration projects and performance upgrades.
Types of Brake Calipers
Brake calipers generally fall into two main categories:
- Floating (or Sliding) Calipers: These are the most common type found on modern passenger vehicles. They have one or two pistons on the inboard side of the rotor. When pressure is applied, these pistons push the inboard pad against the rotor, and the caliper then slides on pins, pulling the outboard pad against the rotor. They are cost-effective to manufacture and maintain.
- Fixed Calipers: These calipers are rigidly mounted and do not move. They have pistons on both sides of the rotor, typically in pairs (2, 4, 6, or even 8 pistons). When pressure is applied, all pistons simultaneously push the pads directly against the rotor. Fixed calipers offer superior braking force, better pedal feel, and more even pad wear, making them common in high-performance and racing applications.
The choice between floating and fixed calipers often comes down to the vehicle's intended use and performance requirements. For most daily drivers, floating calipers are more than adequate, while performance cars and track machines benefit from the enhanced power and feel of fixed calipers.
Maintaining Your Braking System: A Crucial Task
Regular inspection and maintenance are vital for the longevity and effectiveness of your braking system. Ignoring brake issues can lead to dangerous situations and more costly repairs down the line.
Signs You Need New Brake Pads or Calipers
- Squealing or Grinding Noises: A high-pitched squeal often indicates worn pads activating a wear indicator. A grinding noise usually means the pads are completely worn, and metal is rubbing against metal, damaging the rotor.
- Vibrations: Pulsating or vibrating through the brake pedal or steering wheel can indicate warped brake rotors, often caused by excessive heat or uneven pad wear, but can also be a symptom of a sticking caliper.
- Spongy or Soft Brake Pedal: This can be a sign of air in the hydraulic lines, a failing master cylinder, or a leaking caliper.
- Vehicle Pulling to One Side: If your car pulls to one side when braking, it could indicate a seized or sticking caliper on one side, or unevenly worn pads.
- Visible Wear: Visually inspect your brake pads. Most pads have a minimum thickness recommendation (typically around 3mm). If they look thin, it's time for replacement.
- Fluid Leaks: Any visible brake fluid leaks around the calipers or brake lines are an immediate cause for concern and require professional attention.
General Maintenance Tips
- Regular Inspections: Have your brakes inspected during every service. This includes checking pad thickness, rotor condition, caliper function, and brake fluid level and condition.
- Brake Fluid Flushes: Brake fluid is hygroscopic, meaning it absorbs moisture over time. This can lead to a lower boiling point and corrosion within the system. Most manufacturers recommend flushing the brake fluid every 2-3 years.
- Clean Caliper Slide Pins: For floating calipers, ensure the slide pins are clean and well-lubricated to allow smooth movement.
- Bleed Brakes: If you notice a spongy pedal, bleeding the brakes can remove air from the lines, restoring pedal firmness.
Comparative Table: Brake Pad Types
| Pad Type | Pros | Cons | Typical Use |
|---|---|---|---|
| Organic (NAO) | Quiet, low dust, easy on rotors | Lower heat tolerance, prone to fade, shorter lifespan | Light duty, older vehicles |
| Semi-Metallic | Good stopping power, high heat tolerance, durable | Noisier, more dust, can be harder on rotors | Everyday driving, heavy vehicles, some performance |
| Ceramic | Quiet, very low dust, good performance across temperatures | More expensive, may require more pedal pressure when cold | Premium daily driving, light performance |
| HPS (High Performance Street) | Enhanced stopping power, good cold bite, reduced fade, relatively low dust/noise for performance | More expensive than OE, can be slightly noisier than ceramic | Spirited street driving, enthusiast vehicles |
Frequently Asked Questions About Brakes
- How often should I replace my brake pads?
- It varies greatly depending on driving style, vehicle, and pad material, but typically between 20,000 to 70,000 miles. Always check your car's manual and have them inspected regularly.
- Can I replace just the brake pads, or do I need to replace the rotors too?
- While it's possible to replace just pads, it's generally recommended to replace or machine (skim) the rotors at the same time. This ensures an even surface for the new pads to bed into, preventing pulsations and optimising braking performance. If rotors are below minimum thickness, they must be replaced.
- Why are my new brakes squealing?
- New pads sometimes squeal during the 'bedding-in' process as the pad material transfers to the rotor surface. If the noise persists, it could be due to improper installation, a lack of anti-squeal grease, or a manufacturing defect. High-performance pads, like some HPS compounds, can also be inherently noisier.
- What is brake fade?
- Brake fade is the reduction in stopping power caused by overheating of the brake components. When pads and rotors get too hot, their coefficient of friction decreases, leading to a noticeable loss of braking effectiveness. HPS pads are designed to resist fade better than standard pads.
- How much does a full brake job (pads and rotors) cost?
- Costs vary widely based on vehicle make/model, parts quality (OE vs. aftermarket performance), and labour rates. For a typical family car, you might expect to pay anywhere from £200 to £600 per axle. High-performance vehicles or those requiring specialist parts like Lockheed components could be significantly more.
In conclusion, your vehicle's braking system is a complex yet critical assembly that demands attention. Whether you're considering an upgrade to HPS brake pads for improved street performance or looking to maintain the classic integrity of a vehicle with Lockheed components, understanding these parts is key. Regular maintenance, prompt attention to warning signs, and choosing the right components for your driving needs will ensure your car stops safely and reliably, every time you press that pedal.
If you want to read more articles similar to Braking Brilliance: Pads, Calipers & More, you can visit the Brakes category.