15/11/2021
For any high-performance vehicle like the Subaru WRX, the braking system is just as crucial as the engine's power. It's not merely about going fast; it's about stopping efficiently and safely. Understanding the types of brake pads your WRX uses, when to upgrade, and how to maintain them is paramount for both performance enthusiasts and daily drivers. This comprehensive guide will delve into the specifics of WRX brake pads, helping you make informed decisions to keep your iconic Subaru stopping on a sixpence.
Understanding WRX Brake Pads: Types and Applications
When it comes to the Subaru WRX, especially models fitted with single-piston rear brake calipers, the choice of brake pad significantly impacts overall braking performance. While the provided information specifically mentions pads suitable for these single-piston rear calipers, it's important to understand the broader categories of brake pads available and their characteristics.
Common Brake Pad Types
Generally, brake pads fall into a few main categories, each with distinct properties:
- Organic Non-Asbestos (NAO) Pads: These are typically quieter and produce less dust. They are made from a mix of fibres, fillers, and resins. While good for everyday driving, their friction material may not withstand the high temperatures generated during aggressive driving or track use in a performance car like the WRX.
- Semi-Metallic Pads: Comprising 30-65% metal (copper, iron, steel, etc.) mixed with organic and inorganic fillers, these pads offer excellent heat transfer and strong braking performance. They are a popular choice for performance vehicles due to their durability and stopping power, though they can be noisier and produce more brake dust than NAO pads.
- Ceramic Pads: Made from ceramic fibres, fillers, and bonding agents, ceramic pads offer a great balance of performance, noise reduction, and low dust. They are known for their clean operation and consistent performance across a wide range of temperatures. For a WRX, high-quality ceramic pads, such as the Brembo Ceramic brake pads mentioned in upgrade kits, can provide excellent street performance with minimal fuss.
For WRX owners, the choice often boils down to a balance between daily driving comfort and spirited performance. While standard pads might suffice for everyday commutes, those who push their WRX hard, whether on B-roads or occasional track days, will benefit from more performance-oriented options like semi-metallic or high-quality ceramic pads.
WRX Brake Upgrade Kits: Elevating Stopping Power
For older WRX models, particularly the 2002-2005 generation, a significant braking improvement can be achieved through dedicated upgrade kits. These kits transform the braking system from stock to a more robust, performance-oriented setup, mimicking later model WRX capabilities.
What a Full WRX Brake Upgrade Kit Includes
A comprehensive Subaru WRX Full Brake Upgrade typically includes:
- Front Calipers: Often four-piston fixed calipers, commonly supplied in a distinctive red finish. These offer superior clamping force and more even pad wear compared to the stock floating calipers.
- Rear Calipers: Two-piston fixed calipers, also in red, to balance the braking force across the vehicle.
- Rotors: Upgraded KNS/DBA rotors for both front and rear. While front rotors may retain the stock WRX size, rear rotors are often upgraded to larger 290mm units, similar to those found on 2006-2007 WRX or 2005-2009 Legacy GT models, enhancing rear braking efficiency.
- Brake Pads: High-quality performance pads, such as Brembo Ceramic brake pads, are included all around to complement the upgraded calipers and rotors.
- Caliper Mounting Brackets: Essential for installing the new rear calipers onto the older chassis.
It's worth noting that front calipers are typically made of steel, while rear calipers are aluminium. This material difference can lead to a slight variation in the red colour finish between the front and rear calipers. However, once installed on the vehicle, this minor aesthetic difference is usually imperceptible to most observers.
Kit Variants and Considerations
These upgrade kits are often available in full front-and-rear sets, or as separate front-only or rear-only kits, allowing owners to tailor the upgrade to their specific needs and budget. For instance, a front-only kit would include front KNS/DBA rotors, front calipers, and Brembo Ceramic pads.
An important consideration for owners of 2002-2005 WRX models is wheel clearance. The larger brake calipers in these upgrade kits require adequate space. Stock 16-inch wheels from this era will NOT fit over the upgraded calipers, meaning a wheel upgrade to larger diameter wheels (typically 17-inch or larger) is often a necessary additional expense.
Cost of Subaru WRX Brake Pads and Replacements
The cost of brake pads for a Subaru WRX can vary significantly based on the type of pad, brand, and whether you're purchasing parts only or including installation labour. While specific figures for the WRX were limited, information regarding the Subaru Impreza provides a useful benchmark, as many components and principles are similar.
Brake pads themselves, without installation, typically range from £50 to £100 per axle for standard replacement pads. For a set of higher-performance or luxury-grade brake pads, prices can range from £150 to £250 per axle. It's common for brake pads to be sold in sets of two (for one axle) since wear usually occurs at a similar rate on both sides of the vehicle.
Installation Costs
When factoring in labour, a full brake pad replacement (parts and labour) can cost anywhere between £150 and £300 per axle. This cost can fluctuate depending on your location, the mechanic's hourly rate, and the extent of any additional damage found (e.g., worn rotors).
It's essential to remember that if your brake pads are severely worn down, they can cause damage to other braking components, most notably the rotors. If rotors are also significantly worn or warped, they will need replacement, adding to the overall cost. Many garages offer free multi-point inspections, which can help diagnose the full extent of wear before commencing work.
| Component/Service | Estimated Cost Range (GBP) | Notes |
|---|---|---|
| Standard Brake Pads (Parts Only) | £50 - £100 | Per axle (e.g., front pair or rear pair) |
| Performance/Luxury Brake Pads (Parts Only) | £150 - £250 | Per axle, for enhanced stopping power |
| Brake Pad Replacement (Parts & Labour) | £150 - £300 | Per axle, includes fitting |
| Brake Pad & Rotor Replacement (Parts & Labour) | £300 - £600+ | Per axle, if rotors are also worn |
Brake Pad Inspection and Lifespan
Regular inspection of your Subaru WRX's brake pads is crucial for safety and maintaining optimal performance. Brake pads are wear items, meaning their friction material gradually diminishes with use. Ignoring worn pads can lead to significantly longer stopping distances and potential damage to other braking components.
How Often Should Brake Pads Be Inspected?
It's highly recommended to have your brakes inspected every time you take your WRX in for service, or at least annually. Many service centres offer free multi-point inspections that include checking brake pad wear. Your owner's manual will also provide specific maintenance intervals and recommendations tailored to your vehicle model.
How Long Do WRX Brake Pads Last?
The lifespan of Subaru WRX brake pads typically ranges between 30,000 and 70,000 miles. However, this figure is heavily influenced by your driving habits. If you frequently drive in heavy traffic, engage in spirited driving, or often use your brakes aggressively, your pads will wear down faster and require more frequent inspection and replacement.
Signs You Need New Brake Pads
Your WRX will often provide clear warning signs when its brake pads are nearing the end of their life:
- Squealing or Screeching: This is often the first sign, caused by a small metal indicator tab built into the brake pad designed to make noise when the friction material is low.
- Grinding Noise: A more severe sound, indicating that the friction material is completely worn away, and the metal backing plate of the pad is grinding against the brake rotor. This requires immediate attention as it can quickly damage your rotors.
- Vibrations or Pulsation: If you feel a pulsation or vibration through the brake pedal or steering wheel when braking, it could indicate warped rotors, often caused by excessively worn pads or overheating.
- Burning Smell: A distinct burning odour can be a sign of overheated brakes or, in severe cases, the friction material completely wearing down and the metal components generating excessive heat.
- Increased Stopping Distances: If your car takes noticeably longer to stop than usual, or the brake pedal feels spongy or low, it's a critical safety concern requiring immediate inspection.
- Brake System Warning Light: Modern vehicles often have sensors that trigger a warning light on the dashboard when brake pad wear reaches a critical level.
If you experience any of these symptoms, it is always advised to have a qualified mechanic inspect your braking system at your earliest convenience. When it comes to brakes, it's always better to err on the side of safety.
Can You Put New Brake Pads on Old Rotors?
The short answer is yes, in some cases. Brake components typically wear down at different rates, with brake pads usually being the first to require replacement before the rotors. If your rotors are still within their minimum thickness specification and show no signs of warping, deep grooves, or excessive scoring, it may be acceptable to install new brake pads on old rotors.
However, it is crucial to properly prepare the old rotors before installing new pads. This usually involves 'resurfacing' or 'machining' the rotors to ensure a perfectly flat and smooth surface for the new pads to bed into. This process removes minor imperfections and ensures optimal contact, preventing uneven wear and potential noise issues.
It's important to keep in mind that if your brake pads have been severely degraded and not replaced promptly, they can cause significant wear and damage to your brake rotors. In such cases, replacing both the pads and rotors simultaneously is essential not only for safety reasons but also to maintain the integrity and longevity of your entire braking system. Always consult your mechanic for a professional assessment, as they can accurately measure rotor thickness and assess their condition.
Frequently Asked Questions About WRX Brake Pads
Here are some common questions WRX owners have regarding their brake pads:
What are the best brake pads for a Subaru WRX?
The "best" brake pads depend on your driving style. For daily driving with occasional spirited use, high-quality ceramic pads (like Brembo Ceramic) offer a good balance of low noise, low dust, and consistent performance. For more aggressive driving or track days, semi-metallic or dedicated performance pads might be more suitable due to their higher friction and heat resistance. Genuine Subaru brake pads are always a safe bet, designed specifically for your vehicle's specifications.
Do front and rear brake pads wear at the same rate on a WRX?
Generally, front brake pads tend to wear faster than rear brake pads in most vehicles, including the WRX, because the front brakes perform a larger percentage of the stopping work (due to weight transfer under braking). However, specific driving habits and brake bias can influence this. It's common practice to inspect both front and rear pads during service.
Why is my WRX making a grinding noise when I brake?
A grinding noise typically indicates that the friction material on your brake pads has completely worn away, and the metal backing plate of the pad is now contacting the brake rotor directly. This is a severe issue that requires immediate attention as it can quickly damage your rotors and significantly compromise your braking ability. Stop driving your car and have it inspected immediately.
What is the typical lifespan of WRX brake pads?
Subaru WRX brake pads usually last between 30,000 and 70,000 miles. However, this can vary greatly depending on driving conditions (e.g., heavy city traffic vs. open motorway driving) and your personal driving style. Aggressive braking will naturally reduce their lifespan.
Should I replace my brake pads myself or have a mechanic do it?
Replacing brake pads requires specific tools and a good understanding of braking systems to ensure safety. While parts can be ordered online for DIY enthusiasts, if you're not confident in your mechanical abilities, it's always safer to have a qualified mechanic perform the replacement. Incorrect installation can lead to dangerous braking performance.
Maintaining the braking system of your Subaru WRX is non-negotiable for both performance and safety. Regular inspections, timely replacements, and choosing the right brake pads for your driving style will ensure your WRX continues to deliver exhilarating drives with the confidence of reliable stopping power. Don't overlook the importance of your brakes; they are arguably the most critical safety system in your vehicle.
If you want to read more articles similar to WRX Brake Pads: Your Ultimate UK Guide, you can visit the Brakes category.