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The TTSPORT Circuit Racing TR41 is a rear-axle 4-piston big brake kit built for circuit work, time attack, and endurance use. A monoblock forged caliper, two-piece floating-or-fixed rotors, and a track-tuned pad window give you a predictable pedal lap after lap, with serviceable hardware designed for a real pit workflow.
Rear brake torque controls rotation, trail-braking attitude, and ABS/electronic stability behavior. The TR41 rear caliper uses a 31.8 mm / 36 mm staggered piston layout (4-piston, 36.12 cm² per caliper) so initial bite stays linear and the rear axle does not over-grab as pads heat up. Paired with a front BBK or OE setup, it lets you tune front-to-rear bias through pad compound and rotor diameter rather than fighting the hardware.
Two-piece rotors in Ø330 or Ø345 × 28 mm internally vented construction shed heat between corners. Choose standard heat-treated high-carbon iron with a 0–600 °C pad window for sprint and HPDE work, or step up to racing-grade iron with a 0–750 °C pad (avg μ 0.45) for endurance and back-to-back sessions where rear pad temperatures climb. Left/right specific directional vanes pump air through the rotor for consistent recovery.
| Group | Specification | Detail |
|---|---|---|
| Caliper | Series | Racing Series — Circuit |
| Model / Application | TR41 | |
| Axle Position | Rear | |
| Piston Count | 4-piston | |
| Piston Type | Racing pistons, no dust boots | |
| Piston Diameter | 31.8 mm × 2, 36 mm × 2 | |
| Total Piston Area | 36.12 cm² per caliper | |
| Caliper Dimensions | 284 × 152.8 × 75 mm | |
| Construction | Monoblock forged aluminum | |
| Net Weight | 2.50 kg per caliper (without pads) | |
| Fitment | Wheel Clearance | 17 in or larger |
| Recommended Rotor Size | Ø330–345 mm × 28 mm | |
| Rotors | Material (Standard) | Heat-treated high-carbon cast iron |
| Material (Option B) | Racing-grade heat-treated high-carbon cast iron | |
| Dimensions | Ø330 / 345 mm × 28 mm | |
| Construction | Two-piece, internally vented | |
| Mounting | Fixed or floating (size & application dependent) | |
| Face Pattern | Curved Slot / Grain Slot / Wave Slot / Drilled & Slotted (Option B: Wave Slot) | |
| Pads | Compatible Rotors | Iron / steel only |
| Operating Temp Range | 0–600 °C (Standard) / 0–750 °C (Option B) | |
| Average μ | 0.38 (Standard) / 0.45 (Option B) | |
| Brake Lines | Construction | Three-layer reinforced |
| Material | PTFE liner / SUS304 braid / PVC sheath | |
| Mounting | Caliper Mount | Radial, with vehicle-specific brackets |
| Service | Bedding-In | Required before track use |
| Rotor Material | Rotor Size | Pad Window | Best Use |
|---|---|---|---|
| Steel (HC heat-treated) | 330 × 28 mm | 0–600 °C, μ 0.38 | HPDE, sprint, club race |
| Steel (HC heat-treated) | 345 × 28 mm | 0–600 °C, μ 0.38 | Heavier chassis, longer sessions |
| Racing Steel | 330 × 28 mm | 0–750 °C, μ 0.45 | Time attack, endurance heat soak |
| Racing Steel | 345 × 28 mm | 0–750 °C, μ 0.45 | Endurance, heavy GT, back-to-back stints |
Caliper finish: Nickel-plated. Custom color is not available on this caliper.
Rear pads on a circuit car typically see lower energy than fronts but require predictable release for trail-braking and rotation. The standard 0–600 °C compound (avg μ 0.38) is the right pick for most rear-axle setups behind a hot front BBK — it keeps rear bias stable as fronts climb in temperature. Move to the 0–750 °C / μ 0.45 Option B when running long stints, heavy chassis, or aggressive front pads where rear thermal load and bias shift are higher.
TR41 rear kits ship with vehicle-specific radial brackets and brake-line fittings. If your chassis is not a standard catalog application — custom subframe, swapped rear knuckles, motorsport hub conversion, or non-OE rotor offset — send your hub face, rotor mounting, and wheel clearance details to our engineering team. We will validate bracket geometry and line routing before production.
The TR41 in this listing is a rear-axle 4-piston caliper, sized and valved for rear brake balance on a balanced race car. It is intended to pair with a matching front BBK or a properly biased OE front setup.
The TR41 rear caliper accepts Ø330 mm or Ø345 mm × 28 mm two-piece rotors and requires a 17-inch or larger wheel. Final clearance depends on wheel barrel and spoke profile.
For HPDE, sprint, and most club racing, the standard 0–600 °C compound (avg μ 0.38) gives a stable rear bias. For endurance, time attack, or heavy chassis where rear pads see higher heat, choose the 0–750 °C Option B compound (avg μ 0.45).
No. The TR41 ships in a nickel-plated finish only. Custom color is not offered on this caliper.
The kit uses radial-mount brackets and brake-line fittings made for each application. Confirm your exact chassis with us before ordering — for non-catalog or custom builds, our engineering team will validate bracket geometry and line routing.
Yes. A proper bedding-in procedure is required before track use to transfer pad material evenly to the rotor and stabilize friction. Follow the included procedure before your first hot session.
Need help speccing rear bias, pad compound, or a custom bracket for the TR41?
You’re here because you’re passionate about your ride, and so are we. We want your TTSPORT brake upgrade to be a total win. Here’s some straight talk to make sure everything goes smoothly, from fitment to bedding in.
Look, we know you get it. Your brake kit is custom-made for your specific car. That means once it's built, it's yours. We can only accept returns if there’s a genuine quality defect from our side.
Sometimes, aftermarket wheels can be tricky. Depending on the design, you might need spacers for clearance. We’ll do our best to help you figure it out, but issues related to wheel spacers don't qualify for a return.
To get this right the first time, we need your help. Before you order, please give us the following info:
We’ll likely ask you to confirm some measurements and send a few photos of your wheels. Please double-check everything you send us. TTSPORT isn't responsible for fitment issues if the specs you provided were off.
We check every single part before it leaves our shop. When your kit arrives, give it a good look-over. If you spot any potential quality issues, let us know within 24 hours.
This is key to awesome performance. Don't skip it.
We build our kits to last, and we stand by our work. Here’s the breakdown:
Recommended Service Intervals:
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