23/01/2010
Enhancing Your Toyota GR86's Braking System
The Toyota GR86, a true driver's car, offers an engaging and exhilarating experience. While its standard braking system is competent for everyday driving, many enthusiasts seek to elevate its performance, especially when pushing the car to its limits on track days or spirited drives. Fortunately, a range of upgrades can significantly improve stopping power, feel, and fade resistance. This guide will delve into some of the most effective modifications for your GR86's brakes, focusing on practical solutions that offer a noticeable difference.
Performance Brake Pads: The First Line of Defence
For many owners, the most immediate and impactful upgrade is a set of performance brake pads. While the GR86 comes equipped with a respectable braking setup, performance pads are engineered with materials that offer a higher coefficient of friction and greater resistance to heat buildup. This translates to more assertive initial bite and improved stopping power, particularly under demanding conditions.
A popular and highly recommended option for a blend of street usability and track capability are the Hawk HP+ pads. These pads are known for their excellent performance across a wide temperature range. They offer a significant improvement in stopping distance compared to stock pads and are well-suited for occasional track use. A key advantage of the HP+ pads is their dual-purpose nature; they can be effectively used on the street, although it's worth noting that they can produce some squeal when cold. This is a common characteristic of many high-performance friction materials, and for most drivers, the benefits far outweigh this minor inconvenience.
When considering brake pads, it's crucial to understand that different compounds cater to different driving styles and environments. For pure track use, more aggressive compounds might be considered, but for a versatile upgrade that enhances both daily driving and occasional spirited sessions, the Hawk HP+ represents a fantastic middle ground.
Brake Fluid: The Unsung Hero
Brake fluid is the hydraulic medium that transmits the force from your brake pedal to the calipers. Under heavy braking, especially on a track, brake fluid can reach very high temperatures. When brake fluid overheats, it can turn to vapour, leading to a spongy brake pedal and a significant loss of braking performance, a phenomenon known as brake fade. This is where upgrading your brake fluid becomes paramount.
The standard brake fluid in most vehicles has a relatively low dry and wet boiling point. For the GR86, and indeed any performance-oriented car, using a high-temperature brake fluid is a non-negotiable upgrade if you intend to drive it hard. A fluid with a higher boiling point will resist vaporization at elevated temperatures, ensuring a firm and consistent brake pedal even under extreme stress.
Motul RBF600 is a widely respected and excellent choice for a high-performance brake fluid. It boasts a significantly higher dry boiling point than conventional DOT 3 or DOT 4 fluids. Other fluids with similar high boiling points (often referred to as 600-degree fluids, referring to their dry boiling point in Fahrenheit) are also excellent options. Regularly bleeding your brakes and replacing the fluid is also a crucial part of maintenance, especially if you frequent the track. It's advisable to bleed the brakes between track days to ensure optimal performance and safety.
Stainless Steel Braided Brake Lines: Enhancing Pedal Feel
While pads and fluid address the core performance of the braking system, the lines that carry the fluid can also be a limiting factor. Standard rubber brake lines, while adequate for normal driving, can expand slightly under pressure, especially when heated. This expansion can lead to a less precise and somewhat "squishy" brake pedal feel.
Upgrading to stainless steel braided brake lines offers a significant improvement in pedal feel and responsiveness. These lines consist of a PTFE (Teflon) inner core, surrounded by a layer of braided stainless steel, and often finished with a protective outer sleeve. The stainless steel braiding prevents the line from expanding under pressure, ensuring that the hydraulic force is transmitted directly and instantaneously from the master cylinder to the caliper. This results in a firmer, more direct, and predictable brake pedal, allowing for better modulation and control.
The installation of stainless steel brake lines is a more involved process than simply swapping pads or fluid, but the benefits in terms of pedal feel and confidence are substantial, especially for drivers who value tactile feedback from their vehicle.
Understanding Front-to-Rear Braking Balance
A critical, yet often overlooked, aspect of braking performance is the front-to-rear braking balance. For optimal stopping power and stability, the majority of a car's braking force should be applied by the front brakes, with the rear brakes providing supplementary stopping power and preventing the car from spinning.
The GR86's factory braking system is designed with a specific bias to ensure this balance. However, modifications like changing brake pads can slightly alter this bias. For instance, if you were to fit very aggressive track-focused pads only to the front, you might unsettle the car under braking. Conversely, fitting very aggressive pads only to the rear could lead to premature rear wheel lock-up.
When upgrading your brake components, it is essential to consider how these changes will affect the overall balance. Generally, using similar performance-oriented pads front and rear (like the Hawk HP+ example) helps to maintain or improve the factory balance. If you are embarking on more significant modifications, such as changing brake calipers or master cylinders, understanding and potentially adjusting the brake bias becomes even more important. For most GR86 owners, focusing on high-quality pads, fluid, and lines will naturally enhance the existing, well-engineered balance.
Maintenance and Bleeding Between Sessions
For those who regularly participate in track days or enjoy extended spirited driving sessions, proactive maintenance is key to maintaining peak braking performance and ensuring safety. If you're attending back-to-back track days, it's highly recommended to check your brake pad wear levels and, crucially, to bleed your brakes between each day, or even between sessions if you're pushing the car very hard.
Bleeding the brakes removes any air that may have entered the system and ensures that you have fresh, high-temperature fluid throughout. This simple maintenance step can prevent a sudden loss of braking performance and keep your pedal firm and responsive. Inspecting pad wear is also vital; worn pads will not only reduce braking effectiveness but can also damage rotors.
Are there GR86 Brake Kits?
While you won't find a single, universally defined "GR86 brake kit" that suits everyone, the concept of a kit often refers to a combination of compatible upgrades. For the majority of GR86 owners looking for a significant improvement in braking performance without delving into a full big brake kit (which involves larger calipers, rotors, and potentially a new master cylinder), the combination of:
- High-performance brake pads (e.g., Hawk HP+, EBC Yellowstuff, Project Mu)
- High-temperature brake fluid (e.g., Motul RBF600, Castrol SRF, StopTech STR600)
- Stainless steel braided brake lines
effectively constitutes a comprehensive and highly effective "brake kit" for enhancing the GR86's stopping capabilities. Many reputable aftermarket companies offer these components individually, allowing you to tailor your upgrade to your specific needs and budget. Some may even offer package deals on these essential items.
Frequently Asked Questions
Q1: Will upgrading my brake pads make a big difference?
A1: Yes, high-performance brake pads offer a noticeable improvement in stopping power, initial bite, and resistance to fade compared to standard pads.
Q2: Do I need high-temperature brake fluid for street driving?
A2: While not strictly necessary for normal street driving, it's a highly recommended upgrade for spirited driving and provides a safety margin. If you plan on any track or autocross use, it's essential.
Q3: How often should I bleed my brakes?
A3: For regular street use, follow your manufacturer's recommended interval (typically every 2 years). For track use, bleeding between track days is highly advisable.
Q4: Are stainless steel brake lines worth the cost?
A4: If you value a firm, precise brake pedal feel and want to eliminate pedal sponginess under load, then yes, they are a worthwhile investment.
Q5: Can I mix different brands of brake pads?
A5: It is generally not recommended to mix different brands or types of brake pads on the same axle. For optimal performance and safety, use the same pads on both front wheels and both rear wheels.
By implementing these upgrades, you can significantly enhance your Toyota GR86's braking performance, providing greater confidence and control whether you're navigating city streets or pushing the limits on the open road or track.
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