Low Rotating Mass
1.41 kg forged caliper and a solid Ø325 mm × 12 mm rotor keep unsprung and rotating weight down for sharper steering and faster initiation.
Email: sales@ttsport-racing.com
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Product Detail
xRacing Series · Drift · Front Axle · 4-Piston
DR4 Front 4-Piston Forged Big Brake Kit
A purpose-built front drift package engineered around fast steering response, repeatable lock-up control, and clean pedal modulation. Two-piece forged aluminum 4-piston calipers, Ø325 mm × 12 mm two-piece solid rotors, bootless racing pistons, and braided lines — assembled to your chassis, knuckle, hub, and wheel package.
Racing Series — Drift
Front Axle
4-Piston Forged
Ø35 mm Pistons
Ø325 mm × 12 mm Solid Rotor
17 in Wheel Min.
Motorsport Use
Why Builders Choose the DR4
Drift braking is short, hard, and rotational. The front axle has to bite on entry, hold modulation through transition, and release cleanly without unsettling the chassis. The DR4 is sized for that duty cycle: a forged 4-piston caliper with 38.46 cm² of total piston area, paired with a Ø325 mm × 12 mm two-piece solid rotor to keep rotating mass low and steering response sharp.
Predictable Bite
Four 35 mm pistons with 38.46 cm² total area deliver linear clamp from initial pedal travel through full lock-up — critical for transitions and corrections.
Front Drift Control
Built for entry bite, modulation through transition, and clean release without upsetting the chassis.
Bootless Racing Pistons
Racing pistons without dust boots reduce seal drag and tolerate sustained caliper temperatures that would punish a street kit.
Pad Flexibility
Industry-standard motorsport pad footprint lets you tune entry bite, lock-up window, and endurance behavior without changing hardware.
Vehicle-Specific Engineering
Bracket geometry, rotor hat offset, and brake line fittings are engineered per application — not shipped as a universal upgrade.
Technical Specifications & Kit Options
| Brake Caliper | |||
|---|---|---|---|
| Series | Racing Series — Drift | ||
| Model / Application | DR4 | ||
| Axle Position | Front | ||
| Piston Count | 4-piston | ||
| Piston Type | Racing pistons without dust boots | ||
| Piston Diameter | 35 mm | ||
| Total Piston Area | 38.46 cm² per caliper | ||
| Caliper Dimensions | L 178 mm × W 82 mm × H 106.5 mm | ||
| Manufacturing Process | Two-piece forged aluminum body | ||
| Net Weight | 1.41 kg per caliper, without pads | ||
| Surface Finish | High-temperature gloss coating | ||
| Chrome Finish | Not available on this model | ||
| Recommended Wheel Size | 17 in or larger | ||
| Primary Rotor Size | Ø325 mm × 12 mm | ||
| Brake Rotor Options | |||
| Rotor Option | 325 mm Steel | 330 mm Steel | 343 mm Steel |
| Rotor Material | Heat-treated high-carbon cast iron | Heat-treated high-carbon cast iron | Heat-treated high-carbon cast iron |
| Axle Position | Front | Front | Front |
| Rotor Dimensions | Ø325 mm × 12 mm | Ø330 mm × 12 mm | Ø343 mm × 11 mm |
| Construction | Two-piece rotor assembly | Two-piece rotor assembly | Two-piece rotor assembly |
| Ventilation | Solid | Solid | Solid |
| Mounting | Fixed | Fixed | Fixed |
| Rotor Hats | Application-specific CNC-machined aluminum alloy hats | Application-specific CNC-machined aluminum alloy hats | Application-specific CNC-machined aluminum alloy hats |
| Directional Design | Yes — left/right specific | Yes — left/right specific | Yes — left/right specific |
| Rotor Face Pattern | Curved slot | Curved slot | Curved slot |
| Recommended Use | Primary DR4 matched engineering spec | Custom wheel and bracket geometry requirement | Custom wheel and bracket geometry requirement |
| Brake Pads | |||
| Compatible Rotor Material | Iron / steel rotors only | ||
| Operating Temperature | 0–600 °C | ||
| Average Friction Coefficient | μ ≈ 0.38, varies with temperature, line pressure, and rotor condition | ||
| Compound Tuning | Motorsport pad shapes allow compound changes for entry stability, lock-up control, or endurance heat | ||
| Lines, Brackets & Service | |||
| Brake Line Construction | Three-layer reinforced construction | ||
| Brake Line Material | PTFE inner liner / SUS304 stainless braid / PVC outer sheath | ||
| Caliper Mounting | Radial mount with vehicle-specific caliper brackets | ||
| Caliper Brackets | Vehicle-specific CNC-machined carbon-steel caliper brackets | ||
| Rotor Hats | CNC-machined high-strength aluminum alloy rotor hats matched to hub geometry and rotor offset | ||
| Brake Line Fittings | Vehicle-specific; caliper-side and chassis-side ends vary by application | ||
| Wheel Clearance | 17 in or larger wheel required; final clearance depends on wheel diameter, width, offset, spoke profile, rotor size, and bracket package | ||
| Bedding-In Procedure | Required before hard use | ||
The DR4 caliper is engineered around a Ø325 mm × 12 mm rotor. Steel rotor packages in 330 mm × 12 mm and 343 mm × 11 mm are available through the custom build sheet when wheel and bracket geometry require them. Final rotor selection is confirmed during the build review.
Package List
Calipers ×2
2 × DR4 front two-piece forged 4-piston calipers with high-temperature gloss coating.
Brake Pads
Brake pads for both front calipers, 0–600 °C pad window, intended for iron / steel rotors.
Brake Rotors ×2
2 × two-piece solid front rotors, primary Ø325 mm × 12 mm specification or custom 330 / 343 mm steel package when approved.
Caliper Brackets ×2
Vehicle-specific CNC-machined carbon-steel radial caliper brackets.
Rotor Hats ×2
CNC-machined high-strength aluminum alloy rotor hats matched to front hub geometry and rotor offset.
Brake Hoses ×2
Three-layer stainless-steel braided front brake lines with PTFE inner liner, SUS304 braid, and PVC outer sheath.
The Bespoke Engineering Process
Every DR4 front drift system is engineered around the vehicle’s front knuckle, hub location, rotor hat offset, wheel barrel, spoke clearance, master cylinder, brake line routing, steering angle, suspension package, and intended drift 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 bite, lock-up control, and clean pedal release during initiation and transition.
1. Technical Consultation
We review the chassis, year, front suspension and knuckle setup, hub spec, master cylinder, steering angle, wheel package, tire package, target front brake behavior, and whether the car uses OEM or custom front uprights.
2. Data Submission
For OEM knuckles, provide chassis, year, knuckle / hub spec, master cylinder, and wheel data including diameter, width, offset, and spoke profile. 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 size, caliper bracket geometry, rotor hat offset, brake line ends, caliper color, pad choice, wheel clearance, and installation notes before production, QC, and shipment.
If you are unsure whether your wheel, front knuckle, rotor offset, master cylinder, steering-angle package, or brake line routing is suitable, Contact us before ordering so the engineering team can review the build details.
Installation & Break-In
- This kit is engineered for motorsport and closed-course use.
- DR4 uses radial-mount calipers with vehicle-specific brackets and application-specific brake line fittings.
- Final rotor size, bracket geometry, rotor hat offset, and brake line ends are confirmed during the build review.
- Recommended minimum wheel size is 17 in; larger rotor options require verified wheel and spoke clearance.
- Bedding-in procedure is required before hard use to transfer pad material and stabilize friction.
- Inspect bootless pistons, seals, pad backing plates, and rotor face wear between competition sessions.
- Check braided line ends, banjo bolts, and bracket fasteners after each event.
- Use clean DOT 4 or higher racing brake fluid; flush per event schedule.
This kit is engineered for motorsport and closed-course use. Bootless racing pistons require shop discipline and inspection intervals beyond a typical street BBK.
Frequently Asked Questions
What vehicles does the DR4 front drift kit fit?
The DR4 is a motorsport front big brake kit that uses radial-mount calipers with vehicle-specific brackets and application-specific brake line fittings. Fitment is engineered per chassis, knuckle, hub, and wheel package. Confirm your chassis, suspension, and wheel setup with TTSPORT before production so the bracket, rotor offset, and line ends are built correctly.
What rotor size does this kit use and what wheel clearance is required?
The matched engineering spec uses a Ø325 mm × 12 mm two-piece solid rotor with 4-piston forged calipers. Caliper dimensions are L 178 mm × W 82 mm × H 106.5 mm. Recommended minimum wheel size is 17 in. Larger rotor diameters such as 330 mm × 12 mm or 343 mm × 11 mm steel options are available through the build sheet; clearance must be verified with your wheel and spoke profile.
Why solid rotors and bootless racing pistons on a drift kit?
Drift use generates short, sharp front-axle braking and trail-braking inputs, but the front rotor runs a narrower effective duty cycle than circuit racing. A solid Ø325 mm × 12 mm rotor saves rotating mass and improves steering response, while bootless racing pistons reduce seal drag and tolerate higher caliper temperatures. Both require regular inspection and competition-style service intervals.
What is the operating window of the included pad and can I change compounds?
The supplied pad runs 0–600 °C with an average friction coefficient around 0.38 on iron or steel rotors. Actual μ varies with temperature, line pressure, and rotor condition. The caliper accepts a range of motorsport pad shapes, so you can shift compound and bite characteristics for entry stability, lock-up control, or endurance heat without changing hardware.
Is bedding-in required and how should I service the kit?
Yes. A proper bed-in cycle is required to transfer pad material onto the rotor face and stabilize friction before hard use. For competition service, inspect pistons, seals, pad backing plates, rotor face wear, and braided line ends between sessions. Bootless pistons demand cleaner shop discipline than street calipers.
Can I customize caliper color, rotor size, or bracket spec?
Yes. The DR4 is built to order. Rotor sizing, bracket geometry, and brake line lengths are tailored to your build. Chrome finish is not available on this caliper. Send your chassis, hub, knuckle, master cylinder, and wheel data to start a build.
Ready to spec your DR4 drift build?
Send your chassis, year, knuckle / hub spec, master cylinder, wheel data, steering-angle package, and intended drift use. TTSPORT will confirm rotor size, caliper color, pad choice, rotor hat offset, bracket geometry, and brake line fittings before production.
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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