Single-Caliper Dual-Circuit Layout
One forged caliper handles both handbrake and foot-brake circuits, reducing packaging complexity compared with stacked secondary calipers.
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Description
Drift Racing DR4+2 Rear Wheel 6-Piston Big Brake KitRacing Series Drift Rear Axle Dual Circuit 6 Piston DR4+2 Rear Dual Circuit Drift Big Brake Kit The DR4+2 is a rear drift big brake kit built around one forged caliper with two independent hydraulic circuits one circuit for the handbrake side and one circuit for the foot brake side. One caliper, one rotor, one bracket per corner. No stacked secondary caliper, no shared fluid path between pedal and e brake. Racing Series Drift Rear Axle Dual Circuit
Racing Series · Drift · Rear Axle · Dual-Circuit 6-Piston
DR4+2 Rear Dual-Circuit Drift Big Brake Kit
The DR4+2 is a rear drift big brake kit built around one forged caliper with two independent hydraulic circuits — one circuit for the handbrake side and one circuit for the foot-brake side. One caliper, one rotor, one bracket per corner. No stacked secondary caliper, no shared fluid path between pedal and e-brake.
Racing Series — Drift
Rear Axle
Dual-Circuit Caliper
6-Piston Layout
Ø330 / 343 mm Solid Rotor
17 in Wheel Min.
Motorsport Use
Why Builders Choose the DR4+2
Stacking a second caliper on the rear knuckle works, but it adds mass, complicates rotor clearance, and forces compromises on bracket geometry. The DR4+2 puts both circuits inside a single two-piece forged body so the handbrake can lock the rear axle on demand while the foot brake stays isolated for pedal feel and threshold modulation.
Isolated Hydraulic Paths
Handbrake line pressure does not contaminate foot-brake pedal feel, so rear lockup and pedal modulation stay separated.
Clean Rear Knuckle Packaging
One radial-mount caliper per corner keeps the rear upright cleaner than dual-caliper setups and simplifies bracket geometry.
Motorsport Caliper Construction
Two-piece forged aluminum body, 2.50 kg per caliper, nickel-plated finish, and bootless racing pistons for heat dump and serviceability.
Drift, Rally & Time-Attack Use
Built for rear axles that need handbrake lock, foot-brake control, and repeatable rear bite during elevated track temperatures.
Vehicle-Specific Engineering
Bracket geometry, rotor hat offset, hub register, hardware, and brake line fittings are confirmed against your chassis before production.
Technical Specifications & Kit Options
| Brake Caliper | ||
|---|---|---|
| Series | Racing Series — Drift | |
| Model / Application | DR4+2 | |
| Axle Position | Rear | |
| Caliper Layout | Single rear caliper with two independent hydraulic circuits | |
| Piston Count | 4 handbrake pistons + 2 hydraulic pistons | |
| Piston Type | Racing pistons without dust boots | |
| Piston Diameter | 27 mm × 2 / 32 mm × 2 / 38 mm × 2 | |
| Caliper Dimensions | L 266 mm × W 118 mm × H 73 mm | |
| Total Piston Area | 50.2 cm² per caliper, all pistons combined | |
| Manufacturing Process | Two-piece 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 | Ø330–343 mm × 11.5–12 mm | |
| Brake Rotor Options | ||
| Rotor Option | 330 mm Steel | 343 mm Steel |
| Rotor Material | Heat-treated high-carbon cast iron | Heat-treated high-carbon cast iron |
| Axle Position | Rear | Rear |
| Rotor Dimensions | Ø330 mm × 12 mm | Ø343 mm × 11.5 mm |
| Construction | Two-piece rotor assembly | Two-piece rotor assembly |
| Ventilation | Solid | Solid |
| Rotor Mounting | Fixed | Fixed |
| Rotor Hats | CNC-machined high-strength aluminum alloy rotor hats | CNC-machined high-strength aluminum alloy rotor hats |
| Directional Design | Yes — left/right specific | Yes — left/right specific |
| Rotor Face Pattern | Curved slot | Curved slot |
| Recommended Use | Standard rear drift rotor for 17 in wheels and tighter knuckle packaging | Larger swept area for high-speed entries and longer endurance heat windows |
| 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 | |
| Pad Window | Consistent rear bite from cold pull-off through repeated competition runs without a sharp drop-off mid-session | |
| 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 | |
| Rotor Hats | CNC-machined high-strength aluminum alloy rotor hats matched to rear hub geometry and rotor offset | |
| Brake Line Fittings | Vehicle-specific — caliper-side and chassis-side fittings vary by application | |
| Circuit Layout | Two independent hydraulic circuits inside one caliper body; handbrake line pressure does not affect foot-brake pedal feel | |
| Wheel Clearance | 17 in or larger wheel required; final clearance depends on wheel offset, spoke profile, rotor diameter, rear hub position, and bracket geometry | |
| Bedding-In Procedure | Required before competition use | |
Both rotor sizes ship as two-piece assemblies with CNC aluminum hats. Custom hat offsets and bracket geometry are available through the engineering workflow. Final rotor selection is confirmed during the build review.
Package List
Calipers ×2
2 × DR4+2 rear two-piece forged dual-circuit calipers with nickel-plated finish, one caliper per rear corner.
Brake Pads
Brake pads for both rear calipers, rated 0–600 °C and intended for iron / steel rotors.
Brake Rotors ×2
2 × rear two-piece solid rotors, selected from Ø330 mm × 12 mm or Ø343 mm × 11.5 mm, left/right specific.
Caliper Brackets ×2
Vehicle-specific CNC-machined carbon-steel radial caliper brackets for correct rear caliper position and alignment.
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 for the independent circuits.
The Bespoke Engineering Process
Every DR4+2 rear drift system is engineered around the vehicle’s rear knuckle, hub location, rotor hat offset, wheel barrel, spoke clearance, hydraulic handbrake layout, brake-line routing, rear bias target, and intended drift, rally, or time-attack use. The goal is not a generic universal fit; the goal is a single-caliper rear package that isolates handbrake pressure from foot-brake pressure while fitting your exact chassis geometry.
1. Technical Consultation
We review the chassis, rear suspension and knuckle setup, rear hub specs, hydraulic handbrake layout, target rear brake behavior, wheel package, tire package, brake bias strategy, and whether the car uses OEM or custom rear uprights.
2. Data Submission
For OEM knuckles, provide chassis details, rear hub specs, wheel size, wheel offset, spoke profile, and handbrake plumbing layout. For custom rear uprights, provide CAD files, technical drawings, hub-face data, rotor mounting dimensions, or accurate caliper mounting-point measurements.
3. Engineering Review & Approval
TTSPORT confirms bracket geometry, rotor hat offset, hub register, rotor size, hardware, brake line fittings, wheel clearance, and pad setup before production begins.
If you are unsure whether your wheel, rear knuckle, rotor offset, hydraulic handbrake layout, brake bias, 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 drift, rally, time-attack, and closed-course motorsport use.
- DR4+2 uses one forged rear caliper per corner with two independent hydraulic circuits inside one caliper body.
- Brackets, hat offsets, and brake line fittings are made to your chassis, rear hub, and caliper mounting points.
- Final wheel clearance depends on wheel offset, spoke profile, rotor diameter, and rear upright geometry.
- A bias valve or proportioning adjustment is recommended when rear brake balance changes.
- Pistons ship without dust boots and require regular inspection, cleaning, and seal service.
- Bedding-in is required before competition use to transfer pad material and stabilize friction.
- This kit is not intended as a daily-driver street upgrade.
Motorsport use. Pistons ship without dust boots and pads are formulated for elevated track temperatures. Bedding-in is required. This kit is not intended as a daily-driver street upgrade.
Frequently Asked Questions
Does the handbrake circuit share fluid with the foot-brake circuit?
No. The DR4+2 has two independent hydraulic circuits inside one caliper body. Handbrake line pressure does not affect foot-brake pedal feel or vice versa.
Can I run this with my existing front brake setup?
Yes, but rear bias will change. Plan brake balance around the new rear piston area, 50.2 cm² per caliper, and the 330 or 343 mm rotor you select. A bias valve or proportioning adjustment is recommended.
What wheel size do I need to clear this caliper?
17 in or larger wheels are required. Final clearance depends on wheel offset, spoke profile, and rotor diameter. Send wheel specs during the fitment review and TTSPORT will confirm.
How is this different from stacking a second caliper on the knuckle?
One forged caliper handles both circuits, so there is less unsprung mass, simpler bracket geometry, and one rotor face to manage thermally instead of two separate caliper mounts and pad sets.
Is the kit ready to bolt on out of the box?
No. Brackets, hat offsets, and brake line fittings are made to your chassis. The engineering workflow is required before production so the kit lines up correctly on your specific rear upright.
What pad temperature window does it run?
0–600 °C with an average friction coefficient of μ ≈ 0.38. That covers cold pull-off through repeated competition runs without a sharp drop-off mid-session.
Start your DR4+2 build
Send your chassis, rear hub, wheel details, hydraulic handbrake layout, and rear upright information. TTSPORT will return a fitment plan for the DR4+2 rear kit.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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I take full responsibility for not paying closer attention to the size specifications. If you have a smaller breed like a Yorkie, Maltese, or a toy Poodle, this product is perfect for your pup. However, for larger dogs, this is utterly inadequate. It won't entertain them for even 20 seconds, let alone 20 minutes.
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