Independent Rear Inputs
Dedicated 4-piston hydraulic caliper for foot-brake modulation, trail braking, and rear bias control.
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Product Detail
xRacing Series · Drift · Rear Axle · Dual 4-Piston
DR4+4 Rear Dual-Caliper Drift Big Brake Kit
Two calipers per rear corner. One job each. The DR4+4 separates handbrake input and foot-brake input into independent hydraulic and mechanical circuits at the rear axle, so handbrake initiation never bleeds pressure back into the foot-brake line or shifts rear brake bias mid-rotation.
Racing Series — Drift
Rear Axle
Dual 4-Piston Setup
8 Pistons Per Corner
Ø325 mm × 12 mm Solid Rotor
17 in Wheel Min.
Motorsport Use
Why Builders Choose the DR4+4
In competition drifting the handbrake is a steering input, not a parking device. When a single rear caliper has to serve both the handbrake mechanism and the hydraulic foot-brake circuit, a hard handbrake pull can push fluid back through the master, soften pedal feel, and unsettle the car at exactly the moment the driver is trying to trail-brake into rotation. The DR4+4 solves this by giving each input its own dedicated caliper.
Dedicated Handbrake Lock
Dedicated 4-piston mechanical caliper handles handbrake lock and release, fully isolated from the hydraulic foot-brake circuit.
Circuit Isolation
Hard handbrake pulls do not feed back into the foot-brake line. Pedal pressure, bias, and modulation stay consistent through entry, transition, and exit.
Shared Rotor Package
Shared Ø325 mm × 12 mm two-piece solid rotor keeps one thermal mass per rear corner for compact packaging and consistent behavior.
Thermal Repeatability
Heat-treated high-carbon iron rotors paired with a 0–600 °C pad window give consistent μ across back-to-back runs and tandem battles.
Vehicle-Specific Engineering
Radial brackets, hose fittings, rotor offset, and wheel clearance are produced to your chassis, knuckle, hub, and wheel package.
Technical Specifications & Kit Options
| Brake Caliper | ||
|---|---|---|
| Series | Racing Series — Drift | |
| Model / Application | DR4+4 | |
| Axle Position | Rear | |
| Caliper Layout | Dual-caliper rear setup: 4-piston hydraulic caliper + 4-piston mechanical handbrake caliper per rear corner | |
| Piston Count | 4 handbrake pistons + 4 hydraulic pistons per rear corner | |
| Piston Type | Racing pistons without dust boots | |
| Piston Diameter | 35 mm | |
| Caliper Dimensions | L 178 mm × W 82 mm × H 106.5 mm | |
| Total Piston Area | 38.46 cm² × 2 per rear corner | |
| Manufacturing Process | Two-piece forged aluminum body | |
| Net Weight | 1.41 kg per caliper, without pads | |
| Surface Finish | High-temperature gloss coating | |
| Recommended Wheel Size | 17 in or larger | |
| Recommended Rotor Size | Ø325 mm × 12 mm | |
| Brake Rotor | ||
| Rotor Material | Heat-treated high-carbon cast iron | |
| Axle Position | Rear | |
| Rotor Dimensions | Ø325 mm × 12 mm | |
| Construction | Two-piece rotor assembly | |
| Ventilation | Solid | |
| Mounting | Fixed | |
| Rotor Hats | CNC-machined high-strength aluminum alloy rotor hats | |
| Directional Design | Yes — left/right specific | |
| Rotor Face Pattern | Curved slot | |
| Brake Pads | ||
| Compatible Rotor Material | Iron / steel rotors only | |
| Operating Temperature Range | 0–600 °C | |
| Average Friction Coefficient | μ ≈ 0.38, varies with temperature, line pressure, and rotor condition | |
| Bedding-In | Required before competition use | |
| Lines, Brackets & Service | ||
| Brake Line Construction | Three-layer reinforced | |
| Brake Line Material | PTFE inner liner / SUS304 stainless braid / PVC outer sheath | |
| Caliper Mounting | Radial mount with vehicle-specific caliper brackets | |
| Caliper Brackets | CNC-machined carbon-steel radial-mount caliper brackets | |
| Brake-Line Fittings | Vehicle-specific; caliper-side and chassis-side fittings vary by application | |
| Circuit Layout | Independent hydraulic foot-brake circuit and mechanical handbrake circuit at the rear axle | |
| Wheel Clearance | 17 in or larger wheel required; final spoke and barrel clearance must be confirmed because the dual-caliper layout takes more radial and axial space than a single-caliper rear setup | |
| Service Items | Pads, seals, and stainless braided lines are replaceable service items | |
The DR4+4 is a Racing Series — Drift platform, not a universal bolt-on. Final bracket geometry, brake-line fittings, rotor offset, and wheel clearance must be confirmed for your specific chassis, knuckle, hub, and wheel package before production.
Package List
Calipers ×4
2 × rear 4-piston hydraulic calipers and 2 × rear 4-piston mechanical handbrake calipers, two calipers per rear corner.
Brake Pads
Brake pads for the rear dual-caliper package, rated 0–600 °C and intended for iron / steel rotors.
Brake Rotors ×2
2 × rear two-piece solid rotors, Ø325 mm × 12 mm, curved-slot face pattern, left/right specific.
Caliper Bracket Packages ×2
Vehicle-specific CNC-machined carbon-steel radial bracket packages for the dual-caliper rear layout.
Rotor Hats ×2
CNC-machined high-strength aluminum alloy rotor hats matched to rear hub geometry and rotor offset.
Brake Hoses
Vehicle-specific stainless braided rear brake lines with PTFE inner liner, SUS304 braid, and PVC outer sheath.
The Bespoke Engineering Process
Every DR4+4 rear drift system is engineered around the vehicle’s rear knuckle, hub location, rotor hat offset, wheel barrel, spoke clearance, handbrake hydraulic layout, mechanical handbrake packaging, brake-line routing, rear bias target, and intended drift use. The goal is not a generic universal fit; the goal is a rear brake package that isolates handbrake input from foot-brake input and gives the driver repeatable rear lock, pedal behavior, and modulation during entry, transition, and tandem runs.
1. Technical Consultation
We review the chassis, rear suspension and knuckle setup, hub package, wheel package, handbrake layout, target rear brake behavior, tandem or competition use, tire package, and whether the car uses OEM or custom rear uprights.
2. Data Submission
For OEM knuckles, provide chassis, year, knuckle, hub, wheel diameter, wheel width, offset, spoke profile, and handbrake layout details. For custom rear uprights, provide CAD files, technical drawings, hub-face data, rotor mounting dimensions, or accurate bracket mounting-point measurements.
3. Engineering Review & Approval
TTSPORT confirms dual-caliper bracket geometry, rotor hat offset, brake-line fittings, mechanical handbrake packaging, wheel clearance, pad choice, bedding requirements, and installation notes before production begins.
If you are unsure whether your wheel, rear knuckle, rotor offset, handbrake layout, or brake-line routing is suitable, Contact us before ordering so the engineering team can review the build details.
Installation & Break-In
- This system is designed for competition drift, track, and closed-course use.
- The rear axle uses two separate calipers per side: one dedicated 4-piston hydraulic caliper for foot-brake input and one dedicated 4-piston mechanical caliper for handbrake input.
- Caliper brackets are radial-mount and machined for your specific knuckle, hub, and rotor offset.
- Brake-line fittings on the caliper side and chassis side are application-specific.
- Final spoke and barrel clearance must be confirmed against your specific wheel before production because the dual-caliper layout takes more radial and axial space than a single-caliper rear setup.
- Pads must complete the bedding-in procedure before being driven hard.
- Racing pistons do not use dust boots and require regular seal inspection.
- Pads, seals, and stainless braided lines are replaceable service items for endurance and competition drift programs.
Motorsport use. This system is designed for competition drift, track, and closed-course use. Pads must complete the bedding-in procedure before being driven hard. Racing pistons do not use dust boots and require regular seal inspection.
Frequently Asked Questions
What makes the DR4+4 different from a standard rear BBK?
It uses two separate calipers per side at the rear axle: a dedicated 4-piston hydraulic caliper for foot-brake input and a dedicated 4-piston mechanical caliper for handbrake input. The two circuits are isolated, so a hard handbrake pull does not bleed pressure back into the foot-brake circuit or upset rear brake bias mid-corner.
What rotor size and wheel clearance does this kit require?
The DR4+4 is engineered around a Ø325 mm × 12 mm two-piece rotor and requires a 17-inch or larger wheel. Final spoke and barrel clearance must be confirmed against your specific wheel before production because the dual-caliper layout takes more radial and axial space than a single-caliper rear setup.
Is this a direct bolt-on kit?
No. This is a Racing Series — Drift platform. Caliper brackets are radial-mount and machined for your specific knuckle, hub, and rotor offset. Brake-line fittings on the caliper side and chassis side are also application-specific. Submit your chassis, knuckle, hub, and wheel details so TTSPORT can confirm fitment before manufacturing.
What pad operating range and friction level should I expect?
The included pads are rated for 0–600 °C operating temperature with an average friction coefficient of μ ≈ 0.38. Actual μ varies with rotor temperature, line pressure, and rotor condition. A proper bedding-in procedure is required before competition use.
Can I order this kit in a custom configuration?
Yes. Custom build pricing is available for non-standard rotor offsets, bracket geometry, hose routing, or finish. Contact the engineering team with your build sheet and TTSPORT will quote a custom configuration.
Are the calipers and hardware serviceable?
Yes. The calipers use a two-piece forged aluminum body with racing pistons, no dust boots, for easy seal service between events. Pads, seals, and stainless braided lines are replaceable service items, which is critical for endurance and competition drift programs.
Spec your DR4+4 build
Send your chassis, knuckle, hub, wheel details, handbrake layout, and rear suspension setup to TTSPORT for fitment confirmation and a custom quote.
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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