Rear-Axle Bias Control
Designed to pair with a front BBK or OE setup while letting you tune front-to-rear bias through pad compound and rotor diameter.
Email: sales@ttsport-racing.com
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Product Detail
xRacing Series · Circuit · Rear Axle · 4-Piston
TR41 Circuit Racing Rear 4-Piston Big Brake Kit
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.
Why Builders Choose the TR41
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 architecture, and 36.12 cm² piston area per caliper so initial bite stays linear and the rear axle does not over-grab as pads heat up.
Monoblock Forged Caliper
Monoblock forged aluminum body gives high stiffness and low pedal compliance under repeated heavy braking.
Racing Piston Package
Racing pistons without dust boots are designed for high pad and caliper temperatures plus quick teardown service.
Two-Piece Rotor Platform
Two-piece rotors in Ø330 or Ø345 mm × 28 mm internally vented construction help shed heat between corners.
Track Pad Windows
Choose 0–600 °C standard pads for sprint and HPDE work, or 0–750 °C Option B pads for endurance and back-to-back sessions.
Pit-Friendly Serviceability
Open-back pad access, replaceable friction rings, stainless braided lines, and required bedding-in support a real pit workflow.
Technical Specifications & Kit Options
| Brake 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 mm × 152.8 mm × 75 mm | |||
| Construction | Monoblock forged aluminum | |||
| Net Weight | 2.50 kg per caliper, without pads | |||
| Finish | Nickel-plated | |||
| Custom Color | Not available on this caliper | |||
| Caliper Mount | Radial mount with vehicle-specific caliper brackets | |||
| Recommended Wheel Size | 17 in or larger | |||
| Recommended Rotor Size | Ø330–345 mm × 28 mm | |||
| Brake Rotor Options | ||||
| Configuration | Standard 330 mm | Standard 345 mm | Option B 330 mm | Option B 345 mm |
| Rotor Material | Heat-treated high-carbon cast iron | Heat-treated high-carbon cast iron | Racing-grade heat-treated high-carbon cast iron | Racing-grade heat-treated high-carbon cast iron |
| Rotor Dimensions | Ø330 mm × 28 mm | Ø345 mm × 28 mm | Ø330 mm × 28 mm | Ø345 mm × 28 mm |
| Construction | Two-piece, internally vented | Two-piece, internally vented | Two-piece, internally vented | Two-piece, internally vented |
| Rotor Hat | Application-specific alloy hat | Application-specific alloy hat | Application-specific alloy hat | Application-specific alloy hat |
| Mounting | Fixed or floating, size and application dependent | Fixed or floating, size and application dependent | Fixed or floating, size and application dependent | Fixed or floating, size and application dependent |
| Directional Design | Left/right specific | Left/right specific | Left/right specific | Left/right specific |
| Face Pattern | Curved Slot / Grain Slot / Wave Slot / Drilled & Slotted | Curved Slot / Grain Slot / Wave Slot / Drilled & Slotted | Wave Slot | Wave Slot |
| Best Use | HPDE, sprint, club race | Heavier chassis, longer sessions | Time attack, endurance heat soak | Endurance, heavy GT, back-to-back stints |
| Brake Pad Options | ||||
| Pad Option | Standard | Option B | ||
| Compatible Rotors | Iron / steel only | Iron / steel only | ||
| Operating Temperature Range | 0–600 °C | 0–750 °C | ||
| Average Friction Coefficient | μ ≈ 0.38 | μ ≈ 0.45 | ||
| Recommended Use | HPDE, sprint, club racing, rear-axle setups behind a hot front BBK | Endurance, time attack, heavy chassis, aggressive front pad combinations | ||
| Lines, Brackets & Service | ||||
| Brake Line Construction | Three-layer reinforced | |||
| Brake Line Material | PTFE liner / SUS304 braid / PVC sheath | |||
| Caliper Brackets | Vehicle-specific radial caliper brackets | |||
| Rotor Hats | Application-specific alloy rotor hats | |||
| Wheel Clearance | 17 in or larger wheel; final clearance depends on wheel barrel and spoke profile | |||
| Bedding-In Procedure | Required before track use | |||
Caliper finish: Nickel-plated. Custom color is not available on this caliper. Final clearance depends on wheel barrel, spoke profile, rear knuckle, hub location, rotor hat offset, and bracket geometry.
Package List
Calipers ×2
2 × TR41 rear monoblock forged 4-piston calipers, nickel-plated finish.
Brake Pads
Brake pads for both rear calipers, selected from standard 0–600 °C or Option B 0–750 °C pad window.
Brake Rotors ×2
2 × two-piece internally vented rear rotors, Ø330 or Ø345 mm × 28 mm, left/right specific.
Caliper Brackets ×2
Vehicle-specific radial caliper brackets for correct rear caliper alignment on the supported rear knuckle.
Rotor Hats ×2
Application-specific alloy rotor hats matched to rear hub location and rotor offset.
Brake Hoses ×2
Stainless braided rear brake lines with PTFE liner, SUS304 braid, and PVC sheath.
The Bespoke Engineering Process
Every TR41 rear circuit racing system is engineered around the vehicle’s rear knuckle, hub location, rotor hat offset, wheel barrel, spoke clearance, brake line routing, and rear brake bias target. The goal is not a generic universal fit; the goal is a rear brake package that works with your chassis geometry and gives the driver repeatable pedal behavior lap after lap.
1. Technical Consultation
We review the chassis, rear suspension and knuckle setup, competition use, target rear brake behavior, wheel package, tire package, front brake pairing, ABS / electronic stability behavior, and whether the car uses OEM or custom rear uprights.
2. Data Submission
For OEM knuckles, provide vehicle information and detailed wheel specifications. For custom knuckles, provide CAD files, technical drawings, hub-face data, rotor mounting information, or accurate mounting-point measurements so the bracket and rotor-hat package can be evaluated correctly.
3. Engineering Review & Approval
TTSPORT reviews the submitted data, confirms the vehicle-specific radial caliper bracket, rotor hat offset, brake line approach, and required fitment details for approval before manufacturing begins.
If you are unsure whether your wheel, rear knuckle, rotor offset, or brake line layout is suitable, Contact us before ordering so the engineering team can review the build details.
Installation & Break-In
- TR41 rear kits ship with vehicle-specific radial caliper brackets and brake-line fittings.
- If your chassis is not a standard catalog application, send hub face, rotor mounting, wheel clearance, rear knuckle, and line-routing details to the engineering team before production.
- For custom subframes, swapped rear knuckles, motorsport hub conversions, or non-OE rotor offsets, bracket geometry and line routing must be validated before manufacturing.
- Open-back pad access allows pad changes without removing the caliper.
- Two-piece rotor design allows friction ring replacement while retaining the alloy hat.
- Bedding-in procedure is required before first hot lap or track use.
Frequently Asked Questions
Is the TR41 a front or rear caliper?
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.
What rotor size and wheel size do I need?
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.
Which pad compound should I run?
For HPDE, sprint, and most club racing, the standard 0–600 °C compound with average 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 with average μ 0.45.
Can I change the caliper color?
No. The TR41 ships in a nickel-plated finish only. Custom color is not offered on this caliper.
Does it fit my car out of the box?
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.
Is bedding-in required?
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.
Ready to spec your TR41 rear racing system?
Need help speccing rear bias, pad compound, rotor size, rotor hat offset, or a custom bracket for the TR41?
Care Guide
xBrake Kits · Fitment · Installation · Care Guide
Brake Kit Care Guide
A brake kit is not just a pair of larger calipers. Calipers, rotors, pads, hoses, brackets, rotor hats, mounting hardware, brake fluid, wheel clearance, and bedding procedure all work together as one system.
This guide explains how to confirm the right TTSPORT brake kit before ordering, what to check before installation, and how to care for the system after installation.
1. Before Ordering: Confirm the Full Vehicle Setup
Do not order a brake kit by vehicle name alone. The correct kit depends on the vehicle, axle position, wheel package, driving use, and brake system layout.
- Vehicle year, make, model, trim, market version, and chassis code if available
- Front or rear axle position
- Current brake rotor diameter, thickness, and caliper type if known
- Wheel diameter, width, offset, spoke shape, and inner barrel clearance
- Tire size and vehicle weight changes from armor, cargo, towing equipment, or track setup
- Driving use: daily street, towing, mountain driving, off-road, HPDE, rally, drift, track, or competition
- Whether the vehicle uses electronic parking brake, brake pad wear sensors, ABS / ESC systems, or special hydraulic routing
Brake kits are application-specific. A visually similar kit can still have the wrong rotor offset, bracket geometry, hose fitting, caliper position, or wheel clearance requirement.
2. Understand What Type of Brake Kit You Are Ordering
Different TTSPORT brake kit series use different hardware layouts. Always confirm what the kit includes before purchase.
Direct-Mount Kits
Use direct-mount calipers and one-piece rotors where specified. These kits do not use rotor hats or caliper brackets unless the final product page clearly states otherwise.
Two-Piece Rotor Kits
Use separate friction rings and rotor hats. Hat offset, ring bolt pattern, hardware style, and rotor direction must be matched correctly.
Racing / Custom Kits
May require bespoke brackets, rotor hats, brake lines, and engineering confirmation based on knuckle, hub, wheel, and competition use.
Off-Road / Heavy Vehicle Kits
Require extra attention to wheel clearance, tire size, vehicle load, descent control, hose routing, and dust / water exposure.
Do not assume every brake kit includes the same parts. Package contents vary by product series, vehicle application, and final order configuration.
3. Confirm the Kit Specification Before Payment
Before finalizing the order, review the kit specification carefully. Confirm the brake kit is matched to your vehicle and wheel setup, not only to the model name.
- Confirm vehicle application and axle position
- Confirm caliper model, piston count, and caliper color if applicable
- Confirm rotor diameter, rotor thickness, rotor construction, and left / right direction if applicable
- Confirm brake pad compound and intended use
- Confirm brake hose fitting type and routing compatibility
- Confirm whether caliper brackets, rotor hats, mounting hardware, wear sensors, or brake fluid are included
- Confirm minimum wheel diameter and spoke clearance requirement
- Confirm lead time, shipping method, and final invoice details
If any part is not listed in the final order or product page, do not assume it is included.
4. Before Installation: Inspect the Complete Kit
Inspect every component before installation. Do not modify, grind, drill, stretch, force, or space brake kit components to make them fit.
- Check all received parts against the order confirmation
- Inspect calipers, rotors, brackets, hats, hoses, pads, and hardware for shipping damage
- Confirm left / right caliper and rotor orientation where applicable
- Confirm rotor size, pad shape, hose fittings, bracket layout, and hardware style before installation
- Clean all mounting faces before assembly
- Confirm torque values, bedding procedure, fluid type, and bleeding procedure before starting work
- Use a qualified brake technician for installation
Safety: Brake kits affect braking force, hydraulic sealing, heat control, wheel clearance, and vehicle stability. Do not install the kit if fitment, torque, direction, clearance, or compatibility is unclear.
5. Installation Checks
Correct installation is as important as the brake kit itself. A properly engineered kit can still perform poorly if installed with dirty mounting faces, incorrect torque, poor hose routing, or trapped air in the hydraulic system.
Caliper Position
Verify caliper centering over the rotor and confirm even pad sweep across the friction surface.
Rotor Orientation
Confirm left / right rotor direction if the rotor uses directional vanes or directional face pattern.
Brake Hose Routing
Check brake hose length and routing at full steering lock and full suspension travel. No twisting, rubbing, stretching, or kinking.
Wheel Clearance
Check caliper-to-spoke and caliper-to-barrel clearance before road use. Wheel diameter alone is not enough.
Brake Fluid & Bleeding
Use the correct brake fluid type and bleed the system until pedal feel is firm and consistent.
Hardware Security
Torque all brake hardware to the specified value. Do not reuse damaged, unknown, stretched, or corroded safety-critical fasteners.
6. Bedding and First Heat Cycle
Brake pads and rotors need a controlled bedding process before full performance is available. Bedding helps create an even transfer layer on the rotor surface, improving bite, pedal consistency, and vibration resistance.
- Follow the bedding procedure supplied with the exact pad and rotor compound
- Use moderate heat first unless the supplied procedure requires otherwise
- Do not start with emergency stops on a fresh pad / rotor setup
- Avoid holding the brake pedal while stopped on very hot pads and rotors
- Allow the brakes to cool after bedding
- After the first heat cycle, inspect pad contact, rotor surface, hose routing, hardware security, and fluid leaks
Street pads, race pads, iron rotors, two-piece rotors, and carbon ceramic rotors may require different bedding procedures. Use the procedure supplied with the specific kit.
7. Initial Break-In Period
After installation and bedding, give the system a short break-in period before aggressive use. Pedal feel, pad contact, dust output, and noise may continue to settle after the first drives.
- Avoid repeated emergency stops unless required for safety
- Avoid hard track use until bedding and inspection are complete
- Monitor pedal feel, vibration, noise, smell, and rotor surface appearance
- Recheck for fluid leaks after the first road test
- Recheck torque where the kit instructions require post-heat-cycle inspection
- Contact TTSPORT if brake feel changes suddenly after installation
8. Routine Care and Inspection
Brake kits need regular inspection, especially after track use, off-road use, towing, mountain driving, winter salt exposure, or any brake service.
- Inspect brake pads for uneven wear, taper, glazing, cracking, or backing-plate damage
- Inspect rotors for cracks, heavy scoring, hot spots, minimum thickness, and runout
- Inspect calipers for fluid seepage, piston movement, dust boot damage, and uneven pad retraction
- Inspect brake hoses for rubbing, cuts, swelling, leaks, and fitting corrosion
- Inspect brackets, rotor hats, and mounting hardware for cracks, fretting, corrosion, or loosening
- Check brake fluid level, color, service age, and boiling-point suitability for your driving use
- Clean brake dust from wheels and calipers regularly, especially after wet, salty, or track conditions
9. Care by Use Case
Daily Street
Inspect pads, rotors, fluid level, and hose condition during normal service intervals. Prioritize quiet operation, smooth pedal feel, and even wear.
Towing & Mountain Roads
Check pad thickness, rotor surface condition, and fluid condition more often. Long descents create sustained heat even without track use.
Off-Road
Inspect for mud, sand, stone impact, hose abrasion, dust boot damage, and caliper contamination after trail use.
Track / HPDE
Inspect pads, rotors, fluid, and hardware before and after every event. Track heat shortens service intervals.
Drift / Competition
Check rear brake temperature, hydraulic handbrake behavior, pad wear, rotor cracking, and hardware condition frequently.
Carbon Ceramic
Use only compatible pads and approved bedding procedures. Inspect rotor surface condition carefully and avoid incompatible friction materials.
10. Stop Driving If You Notice These Symptoms
Do not continue driving if the brake system shows any of the following symptoms. Inspect the system or contact a qualified brake technician before using the vehicle again.
- Soft pedal, sinking pedal, or sudden increase in pedal travel
- Brake fluid leak or wetness near a line, caliper, fitting, or master cylinder
- Grinding, scraping, severe vibration, or heavy brake judder
- Vehicle pulling strongly to one side under braking
- Burning smell after light driving
- Loose wheel, rotor, caliper, bracket, or hardware noise
- Brake warning light, ABS warning light, or traction-control fault after brake work
Need help confirming brake kit setup or care?
Send your vehicle details, brake kit series, wheel specs, driving use, photos, and any symptoms you notice. TTSPORT will help confirm fitment, installation checks, and the correct care path for your brake kit.
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