Monoblock Forged Aluminum Body
High stiffness, low mass, and minimal caliper deflection at high line pressure.
Email: sales@ttsport-racing.com
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Product Detail
xRacing Series · Circuit · Front Axle · 4-Piston
TR40 Front 4-Piston Racing Big Brake Kit
The TR40 is a front-axle 4-piston racing big brake kit built for circuit, time attack, drift, rally, and endurance cars that need repeatable torque, stable pedal feel, and a predictable pad window under sustained heat. Forged monoblock construction, staggered piston bore, and a two-piece 28 mm iron rotor package give the driver a clean signal at threshold braking instead of caliper flex and pedal drift.
Why Builders Choose the TR40
The TR40 is engineered for track cars that need a lightweight front brake package with real motorsport service logic. It combines a monoblock forged aluminum body, staggered 36 / 41.3 mm pistons, racing pistons without dust boots, two-piece Ø330 / 345 mm rotors, pad compound options, and PTFE / SUS304 braided lines for repeatable braking under sustained pressure.
Staggered 36 / 41.3 mm Pistons
Biases pad pressure toward the trailing edge for even pad wear and consistent torque.
Racing Pistons Without Dust Boots
Built for inspected, serviced race cars; sheds heat instead of trapping it.
Two-Piece Rotor Platform
Ø330 / 345 mm × 28 mm heat-treated high-carbon iron rotors, internally vented and left/right specific.
Pad Compound Options
Choose 0–600 °C street / track pads or 0–750 °C race compound to match your event and rotor package.
Vehicle-Specific Engineering
Bracket geometry, rotor diameter, brake line routing, and pad window are specified around the actual build.
Technical Specifications & Kit Options
| Brake Caliper | ||
|---|---|---|
| Series | Racing Series — Circuit | |
| Model / Application | TR40 | |
| Axle Position | Front | |
| Piston Count | 4-piston | |
| Piston Type | Racing pistons without dust boots | |
| Piston Diameter | 36 mm × 2 / 41.3 mm × 2 | |
| Caliper Dimensions | 284 mm × 152.8 mm × 77.3 mm | |
| Total Piston Area | 47.12 cm² per caliper, all pistons combined | |
| Manufacturing Process | Monoblock forged aluminum body | |
| Net Weight | 2.50 kg per caliper, without pads | |
| Surface Finish | Nickel-plated | |
| Recommended Wheel Size | 17 in or larger | |
| Recommended Rotor Size | Ø330–345 mm × 28 mm | |
| Brake Rotor Options | ||
| Rotor Option | Standard | Option B Racing |
| Rotor Material | Heat-treated high-carbon cast iron | Racing-grade heat-treated high-carbon cast iron |
| Axle Position | Front | Front |
| Rotor Dimensions | Ø330 / 345 mm × 28 mm | Ø330 / 345 mm × 28 mm |
| Construction | Two-piece rotor assembly | Two-piece rotor assembly |
| Ventilation | Internally vented | Internally vented |
| Rotor Hats | Application-specific alloy rotor hats | Application-specific alloy rotor hats |
| Rotor Mounting | Fixed or floating, depending on rotor size and vehicle application | Fixed or floating, depending on rotor size and vehicle application |
| Directional Design | Yes — left/right specific | Yes — left/right specific |
| Rotor Face Pattern | Curved Slot / Grain Slot / Wave Slot / Drilled & Slotted | Wave Slot |
| Recommended Use | Mixed street / track, sprint use, and lower sustained heat demand | Sustained circuit, time attack, endurance, and higher heat cycles |
| Brake Pad Options | ||
| Pad Option | Standard | Option B Race |
| Compatible Rotor Material | Iron / steel rotors only | Iron / steel rotors only |
| Operating Temperature | 0–600 °C | 0–750 °C |
| Average Friction Coefficient | μ ≈ 0.38, varies with temperature, line pressure, and rotor condition | μ ≈ 0.45, varies with temperature, line pressure, and rotor condition |
| Recommended Use | Street / track, HPDE, sprint sessions, and lighter heat load | Time attack, endurance, sustained circuit use, and higher temperature windows |
| Lines, Brackets & Service | ||
| Brake Line Construction | Three-layer reinforced | |
| Brake Line Material | PTFE inner liner / SUS304 stainless braid / PVC protective outer sheath | |
| Caliper Mounting | Radial mount with vehicle-specific caliper brackets | |
| Caliper Brackets | Vehicle-specific radial caliper brackets | |
| Rotor Hats | Application-specific alloy rotor hats matched to front hub geometry and rotor offset | |
| Brake Line Fittings | Vehicle-specific; caliper-side and chassis-side fittings vary by application | |
| Wheel Clearance | 17 in or larger wheel required; final clearance depends on wheel offset, barrel profile, spoke shape, rotor diameter, and bracket package | |
| Brake Balance | Rear setup may require pad compound changes, proportioning valve adjustment, or a matched rear upgrade depending on the build | |
| Bedding-In Procedure | Required before first hot lap | |
Pad selection should match your event temperature window, rotor compound, chassis weight, rear axle setup, and intended use. Ask us before ordering if you are unsure.
Package List
Calipers ×2
2 × TR40 front monoblock forged 4-piston calipers with nickel-plated finish.
Brake Pads
Brake pads for both front calipers, selected from Standard 0–600 °C or Option B Race 0–750 °C compound.
Brake Rotors ×2
2 × two-piece internally vented front rotors, selected from Ø330 or Ø345 mm × 28 mm, left/right specific.
Caliper Brackets ×2
Vehicle-specific radial caliper brackets for correct front caliper position and alignment.
Rotor Hats ×2
Application-specific alloy rotor hats matched to front hub location and rotor offset.
Brake Hoses ×2
Three-layer stainless-steel braided front brake lines with PTFE inner liner, SUS304 stainless braid, and PVC protective outer sheath.
The Bespoke Engineering Process
Every TR40 front racing system is engineered around the vehicle’s front knuckle, hub location, rotor hat offset, wheel barrel, spoke clearance, brake line routing, front brake bias target, rear axle setup, master cylinder, tire package, and intended motorsport use. The goal is not a generic universal fit; the goal is a front brake package that works with your chassis geometry and gives the driver repeatable pedal behavior under sustained heat.
1. Technical Consultation
We review the chassis, front suspension and knuckle setup, event type, wheel size, tire, pad preference, master cylinder, rear axle setup, target brake behavior, and whether the car uses OEM or custom front uprights.
2. Data Submission
For OEM knuckles, provide vehicle details, wheel specs, tire setup, event type, master cylinder information, and current rear brake setup. For custom uprights, provide CAD files, technical drawings, hub-face data, rotor mounting dimensions, or accurate bracket mounting-point measurements.
3. Engineering Review & Approval
TTSPORT confirms rotor diameter, pad compound, vehicle-specific caliper bracket geometry, rotor hat offset, brake line fittings, wheel clearance, and front/rear balance before manufacturing begins.
If you are unsure whether your wheel, front knuckle, rotor offset, rear axle setup, master cylinder, or brake balance target is suitable, Contact us before ordering so the engineering team can review the build details.
Installation & Break-In
- TR40 is a front-axle kit built around vehicle-specific radial caliper brackets, rotor hats, and brake line fittings.
- Send wheel size, tire, pad preference, event type, master cylinder, and any rear axle changes before production.
- If you are upgrading the front only, rear bias may shift and could require pad compound changes, a proportioning valve adjustment, or a matched rear upgrade.
- Choose Standard 0–600 °C pads with curved / grain / wave / drilled rotors for mixed street and track use.
- Choose Option B 0–750 °C race pads with wave-slot racing-grade rotors for sustained circuit, time attack, and endurance use.
- Racing pistons without dust boots are intended for inspected, serviced race cars.
- A proper bedding-in cycle is required before the first hot lap to transfer pad material evenly and stabilize brake torque.
Frequently Asked Questions
Is the TR40 a true motorsport caliper or a street BBK?
It is a motorsport-focused 4-piston front kit. Pistons are racing-spec without dust boots, so the kit assumes regular inspection and service typical of a track or race car.
Will it fit my wheels?
Minimum 17 in wheel is required, and exact clearance depends on wheel offset and spoke profile. Send wheel specs and TTSPORT will confirm before production.
Which rotor and pad option should I pick?
Standard 0–600 °C pads with curved / grain / wave / drilled rotors suit mixed street and track use. Option B with 0–750 °C race pads and wave-slot racing-grade rotors is for sustained circuit, time attack, and endurance use.
Do I need to upgrade the rear at the same time?
Not always, but front-only upgrades shift bias forward. TTSPORT will review your rear setup and recommend a pad change, proportioning valve adjustment, or matched rear kit if needed.
How is fitment handled?
Each TR40 kit is engineered to the chassis: brackets, rotor diameter, line fittings, and pad window are specified for your build. Vehicle, wheel, and use-case info are required before manufacturing.
Is bedding-in really required?
Yes. Iron rotors and race pads need a proper bed-in cycle to transfer pad material evenly. Skipping it causes judder, glazing, and inconsistent torque.
Ready to spec your TR40 build?
Send your chassis, wheel, tire, event type, master cylinder, and current brake setup. TTSPORT will quote rotor size, pad compound, caliper bracket geometry, rotor hat offset, and line fittings for your car.
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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