Audi TT & TTS Brakes: Discs, Pads & Upgrades

Welcome to the exhilarating world of the Audi TTS, and congratulations on your upgrade from the MK2 to the MK3! It's fantastic to hear you're already enjoying the distinct driving experience of your new 2016 model. As you rightly point out, understanding the nuances of your vehicle's braking system is paramount, not just for performance but, more importantly, for safety. You've hit on a crucial topic, as brake components often differ significantly even within the same model range, let alone between generations and performance variants like the TT and TTS.

It's a common misconception that brake components are interchangeable across similar models. However, Audi, like many premium manufacturers, tailors its braking systems to match the specific power outputs, weight distributions, and intended performance characteristics of each variant. This article will delve into the precise differences in brake disc sizes between the MK3 TT and TTS, clarify the implications for brake pads, and provide robust recommendations for your upcoming front pad replacement. We'll also address the historical challenge of aftermarket availability and guide you towards making an informed choice for your high-performance machine.

Understanding Audi TT & TTS Brake Disc Sizes

Your question regarding brake disc sizes for the MK3 TT and TTS is excellent, as this is where the most significant distinctions lie. You're spot on recalling your MK2 TTS had a robust setup of 340mm front and 310mm rear discs. The MK3 generation (8S chassis code) continues this trend of varying brake specifications based on the model's performance tier.

MK3 Audi TT (Standard Models)

For the standard MK3 Audi TT models, such as those with the 1.8 TFSI or 2.0 TFSI engines (without Quattro or specific sport packages), the brake disc sizes are generally smaller than what you'd find on a TTS. Typically, these models come equipped with:

• Front Discs: Approximately 312mm in diameter.
• Rear Discs: Approximately 272mm in diameter.

These sizes are perfectly adequate for the standard TT's power output and intended use, providing confident stopping power for daily driving and spirited road use.

MK3 Audi TT (Quattro & Sport Models)

Some higher-spec MK3 TT models, particularly those with Quattro all-wheel drive or optional sport packages, receive a more substantial braking system to cope with the increased grip and performance potential. These can often feature discs closer in size to the previous generation TTS:

• Front Discs: Around 338mm in diameter.
• Rear Discs: Around 310mm in diameter.

This setup offers a noticeable upgrade in thermal capacity and fade resistance compared to the base TT brakes, bridging the gap towards the TTS's capabilities.

MK3 Audi TTS (Your 2016 Model)

Now, let's talk about your 2016 MK3 TTS. As a performance-oriented model, the TTS naturally comes with a more aggressive braking system designed to handle its higher power output and dynamic capabilities. The standard brake setup for the MK3 TTS is generally as follows:

• Front Discs: Typically 338mm or 340mm in diameter.
• Rear Discs: Typically 310mm in diameter.

These sizes are very similar to what you had on your MK2 TTS, indicating that Audi maintains a consistent performance threshold for its TTS variants. However, it's crucial to note that Audi sometimes offered optional larger brake systems, particularly with certain performance packages. For instance, some MK3 TTS models could be specified with the Audi Sport brake system, which features even larger 370mm front discs and more substantial calipers. To be absolutely certain of your specific disc sizes, especially if considering an upgrade or precise OEM replacement, it's always best to check your vehicle's build sheet, the owner's manual, or physically measure the discs.

Here's a quick comparison table for clarity:

Brake Pad Differences: TT vs. TTS

Beyond the physical disc sizes, the brake pads themselves are engineered differently to complement the varying performance characteristics of the TT and TTS. It's not just about fitting the right shape; it's about the compound, the backing plate, and the overall design that dictates how the pad performs under different conditions.

OEM Pads for Audi TT

Original Equipment Manufacturer (OEM) pads for the standard Audi TT are typically designed for a balance of characteristics: low noise, minimal dust, good cold bite, and reasonable longevity for everyday driving. The compound is generally a non-asbestos organic (NAO) or ceramic-based material, chosen to provide comfortable braking in urban and motorway environments without excessive wear on the discs.

OEM Pads for Audi TTS

The TTS, being a performance model, demands pads that can withstand higher temperatures and provide consistent braking under more aggressive driving. OEM TTS pads often feature a more aggressive friction compound, possibly with higher metallic content or a specific blend of ceramic and metallic fibres. This results in:

• Improved Fade Resistance: Better performance during repeated hard braking.
• Stronger Initial Bite: A more immediate and decisive response when you first press the pedal.
• Higher Thermal Capacity: Able to dissipate heat more effectively without losing braking power.

These characteristics often come with trade-offs, such as potentially more brake dust, slightly more noise (especially when cold), and possibly faster wear compared to standard TT pads. The backing plates and shims on TTS pads might also be designed differently to manage heat and vibration more effectively.

Crucially, you cannot simply put TTS pads onto a standard TT brake calliper if the discs are different sizes, as the pad shape and size must match the calliper it's designed for. Even if the calliper is the same, the pad compound will be different. Always ensure you purchase pads specifically designed for your vehicle's exact make, model, and brake system configuration.

Recommendations for Your MK3 TTS Front Brake Pads

Your observation about early posts suggesting limited aftermarket options for the MK3 TTS brake pads is quite accurate for the initial years of a new model's release. Manufacturers like Audi often have exclusive supply agreements for a period, and it takes time for aftermarket companies to reverse-engineer, test, and produce suitable alternatives. However, by 2016 and certainly now, there are many more reputable aftermarket options available that offer varying performance characteristics. When choosing, consider your driving style and priorities:

1. Original Equipment Manufacturer (OEM) Pads

Why choose them? If you were happy with the braking performance, noise levels, and dust output of your factory pads, sticking with OEM (genuine Audi parts) is always a safe bet. They are engineered specifically for your TTS's braking system, ensuring optimal performance, longevity, and compatibility. You're guaranteed the same balance of performance, comfort, and noise control that Audi intended.

Where to get them? Your local Audi dealership or a reputable Audi specialist parts supplier.

2. Performance-Oriented Aftermarket Pads

If you're looking for an upgrade in braking performance, particularly for spirited driving, track days, or simply desire more bite and fade resistance, several reputable brands offer excellent options. These pads typically feature more aggressive compounds.

• EBC Brakes (Redstuff/Yellowstuff): EBC is a very popular choice in the UK. Redstuff pads are low-dust, good for fast road use, offering improved stopping power over OEM without excessive noise. Yellowstuff are more aggressive, suitable for track days and heavier spirited driving, with higher temperature resistance but potentially more dust and noise.
• Ferodo (DS2500): A fantastic hybrid pad that performs well on both road and occasional track use. Known for excellent bite from cold, good modulation, and strong fade resistance. They can be a bit dustier and noisier than OEM, but the performance gain is significant.
• Pagid (RS series for track, or standard replacement for road): Pagid is a premium brand, often supplying OEM pads for high-performance vehicles. Their aftermarket offerings range from high-quality standard replacements to serious track pads.
• Brembo (OE Replacement or Sport pads): Brembo offers a range of pads from direct OEM replacements to their 'Sport' series, which provide enhanced performance for more demanding drivers.
• Textar / Jurid / ATE: These are often OEM suppliers to Audi for standard pads. They offer high-quality, reliable replacement pads that match or exceed OEM specifications for general road use. They are usually a more cost-effective alternative to genuine Audi parts while maintaining excellent quality.

3. Low-Dust / Ceramic Pads

If brake dust is a significant concern for you, especially with those lovely TTS wheels, consider ceramic-based pads. Brands like Akebono (Euro Ceramic) or certain EBC Redstuff applications are known for producing very little dust while still offering good performance for road use. The trade-off can sometimes be a slightly less aggressive initial bite compared to more metallic compounds, but they are excellent for maintaining wheel cleanliness.

Important Considerations When Choosing Pads:

• Driving Style: Be honest about how you drive. If it's mostly daily commuting, aggressive track pads will be noisy, dusty, and potentially wear out discs faster. If you regularly push the car hard, a performance pad is essential.
• Noise and Dust: More aggressive compounds generally mean more noise (squeal, groan) and dust. There's usually a compromise between performance and comfort.
• Bedding-In Process: Regardless of which pads you choose, a proper bedding-in procedure is crucial. This process transfers a layer of friction material from the pad to the disc, optimising performance and preventing judder. Follow the pad manufacturer's specific instructions, but generally, it involves a series of progressively harder stops from moderate speeds, allowing the brakes to cool between cycles.
• Brake Fluid: Don't forget your brake fluid! It's hygroscopic (absorbs moisture) and should be flushed and replaced every two years, regardless of mileage. Fresh fluid ensures optimal pedal feel and prevents boiling during hard braking.
• Brake Wear Sensors: Your MK3 TTS will have wear sensors on the pads. Ensure any aftermarket pads you purchase are compatible and include the necessary sensor lead, or that you can transfer your existing one if applicable.

Signs Your Brake Pads Need Changing

You mentioned your front pads will need changing in a few months. Here are the key indicators:

• Warning Light: The most obvious sign is the brake pad wear indicator light illuminating on your dashboard. This is triggered by a sensor embedded in the pad touching the disc as the pad wears thin.
• Audible Squeal/Grind: Many pads have a metal tab (wear indicator) that scrapes against the rotor when the pad material is low, producing a high-pitched squeal. If you hear a grinding noise, it means the pad material is completely gone, and you're metal-on-metal, which will rapidly damage your discs.
• Visual Inspection: You can often visually inspect the pads through the wheel spokes. Look at the thickness of the friction material. Generally, if it's less than 3-4mm, it's time for replacement.
• Reduced Braking Performance: A spongy pedal, longer stopping distances, or a need to press the pedal harder than usual can indicate worn pads or other brake system issues.
• Vibration or Pulsation: While often a sign of warped discs, uneven pad wear can also contribute to this.

Frequently Asked Questions (FAQ)

Q1: Can I upgrade my MK3 TT brakes to TTS specification?

A: Potentially, yes, but it's not a simple bolt-on affair. To genuinely upgrade a standard MK3 TT to TTS brake specification, you would typically need to replace the entire brake system components: larger discs, compatible calipers (which are often different in design and piston count), and matching brake pads. You might also need to consider dust shields and potentially even hub carriers if the caliper mounting points differ significantly. This can be a costly endeavour, often requiring professional installation and coding (if your car's ECU needs to be aware of the larger brakes). It's generally more cost-effective to upgrade to higher-performance pads and perhaps slotted or drilled discs within your existing caliper setup if you want improved performance without a full system overhaul.

Q2: Do I need to replace brake discs every time I change pads?

A: Not necessarily every time, but it's highly recommended if the discs are nearing their minimum thickness limit, show signs of severe scoring, cracking, or significant warping (which causes judder). Discs have a minimum thickness stamped on their edge, and if they've worn past this, they must be replaced for safety. Even if not at the minimum, installing new pads on heavily worn or uneven discs can lead to poor braking performance, noise, and premature wear of the new pads. A good rule of thumb is to replace discs every two pad changes, or if they are significantly grooved or lip-edged. For performance cars like the TTS, replacing discs with every pad change can often be a good investment for optimal performance and longevity.

Q3: What's the difference between drilled, slotted, and plain brake discs?

A: Each design has specific benefits:

• Plain Discs: These are standard and most common. They offer consistent friction and noise characteristics, and are generally the most affordable.
• Drilled Discs: Feature holes drilled through the rotor surface. Originally designed to vent gas and heat, they primarily aid in dissipating heat and reducing fade in older pad compounds. They can look sporty but may be prone to cracking under extreme thermal stress, especially in track use.
• Slotted Discs: Have grooves or slots machined into the rotor surface. These slots help to wipe away gas, dust, and water from between the pad and rotor, ensuring a cleaner pad surface and consistent bite. They offer improved performance over plain discs, especially in wet conditions or under heavy braking, without the cracking risk of drilled discs. They can be a bit noisier and wear pads slightly faster.

For your TTS, high-quality plain or slotted discs from a reputable manufacturer (like Brembo, Zimmermann, or Textar) are generally excellent choices. Drilled discs are more about aesthetics unless they are high-quality, factory-drilled units designed for extreme performance.

Q4: How important is the 'bedding-in' process for new brake pads?

A: The bedding-in process is absolutely critical for new brake pads and discs. It's not just a recommendation; it's a fundamental step to ensure optimal braking performance, longevity, and to prevent common issues like brake judder or noise. During bedding-in, a thin, even layer of friction material from the new pads is transferred onto the brake disc. This creates a compatible friction surface, allowing the pad and disc to work together efficiently. Skipping this process can lead to uneven pad material deposits, which manifest as pedal pulsation or judder, reduced braking efficiency, and increased noise. Always follow the specific bedding-in instructions provided by the brake pad manufacturer.

Conclusion

Your MK3 Audi TTS is a fantastic machine, and maintaining its braking system to the highest standard is key to enjoying its performance safely. You've correctly identified that disc sizes vary significantly across the TT and TTS range, with your 2016 TTS likely sporting 338mm or 340mm front discs and 310mm rears as standard, possibly even larger if equipped with the optional Audi Sport brakes. When it comes to replacing your front brake pads, you now have a far wider array of high-quality aftermarket options than were available years ago. Whether you choose to stick with the proven performance of OEM pads or opt for a performance-oriented alternative like EBC Yellowstuff or Ferodo DS2500, ensure the pads are specifically designed for your TTS's braking system.

Always prioritise safety and performance when it comes to brakes. Don't compromise on quality, and remember that proper installation, including the crucial bedding-in process, is just as important as the components themselves. Enjoy your new TTS, and may your stops be as confident as your acceleration!

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