TR48 Front 4-Piston Big Brake Kit

Product Detail
Care Guide

Racing Series · Circuit · Front Axle · 4-Piston

A front-axle 4-piston monoblock BBK engineered for circuit, time-attack, drift, and rally use. Forged caliper, two-piece directional rotors, and a wide pad window deliver thermal repeatability and a consistent pedal from out-lap to checker.

Monoblock forged aluminum 4-piston, 38 / 41 mm Ø355 or Ø380 mm × 32 mm Two-piece rotors Pads to 750 °C, Option B SS braided lines

Why Builders Choose the TR48

The TR48 caliper body is forged from a single aluminum billet for stiffness under sustained line pressure. Four pistons, 38 mm × 2 and 41 mm × 2, generate 49.36 cm² of total clamp area per caliper, with a staggered bore layout that promotes even pad pressure distribution and a more linear bite as pad temperature climbs. Racing-spec pistons run without dust boots to clear hot brake gases on track.

Repeatable Lap-After-Lap Braking

Built for circuit, time-attack, drift, and rally use where pedal consistency matters from out-lap to checker.

Monoblock Forged Caliper

Forged from a single aluminum billet for stiffness under sustained line pressure.

49.36 cm² Piston Area

38 mm × 2 and 41 mm × 2 pistons generate 49.36 cm² total piston area per caliper.

Two-Piece Directional Rotors

Ø355 or Ø380 mm × 32 mm two-piece rotors with internal ventilation and left/right specific directional vanes.

Wide Pad Window

Standard 0–600 °C pads for sprint and HPDE, or Option B 0–750 °C pads for endurance heat loads and aggressive circuit work.

Race-Service Hardware

Stainless braided lines, vehicle-specific brackets, rotor hats, and required bedding instructions support a real track workflow.

Technical Specifications & Kit Options

Brake Caliper
Series	Racing Series — Circuit
Model / Application	TR48
Axle Position	Front
Piston Count	4-piston
Piston Type	Racing pistons without dust boots
Piston Diameter	38 mm × 2 / 41 mm × 2
Caliper Dimensions	258.8 mm × 157.7 mm × 75.2 mm
Total Piston Area	49.36 cm² per caliper
Manufacturing Process	Monoblock forged aluminum body
Net Weight	2.36 kg per caliper, without pads
Surface Finish	Nickel-plated
Recommended Wheel Size	18 in or larger
Recommended Rotor Size	Ø355–380 mm × 32 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	Ø355 / 380 mm × 32 mm	Ø355 / 380 mm × 32 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 and slotted	Wave slot
Recommended Use	Sprint sessions, HPDE, dual-purpose street / track cars driven to events	Sustained high-temperature work, time attack, endurance racing
Brake Pad Options
Pad Option	Standard	Option B Racing
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	μ ≈ 0.45
Recommended Use	Strong sprint and HPDE compound	Built for endurance heat loads and aggressive circuit work
Lines, Brackets & Service
Brake Line Construction	Three-layer reinforced
Brake Line Material	PTFE inner liner / SUS304 braid / PVC outer sheath
Caliper Mounting	Radial mount with vehicle-specific caliper brackets
Caliper Brackets	Vehicle-specific caliper brackets
Brake Line Fittings	Vehicle-specific, caliper-side and chassis-side vary
Wheel Clearance	Minimum 18 in wheels; final clearance depends on wheel barrel, spoke geometry, rotor size, and bracket package
Bedding-In Procedure	Required

Friction values vary with temperature, line pressure, and rotor condition. Choose the compound that matches your session length and chassis weight. Pads on this platform are designed for iron / steel rotor faces only. Do not use carbon-ceramic-only compounds.

Package List

Calipers ×2

2 × TR48 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 0–750 °C pad window.

Brake Rotors ×2

2 × two-piece internally vented front rotors, Ø355 or Ø380 mm × 32 mm, left/right specific.

Caliper Brackets ×2

Vehicle-specific radial caliper brackets for correct front caliper alignment.

Rotor Hats ×2

Application-specific alloy rotor hats matched to front hub location and rotor offset.

Brake Hoses ×2

Stainless braided front brake lines with PTFE inner liner, SUS304 braid, and PVC outer sheath.

The Bespoke Engineering Process

Every TR48 front circuit 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, 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 from out-lap to checker.

1. Technical Consultation

We review the chassis, front suspension and knuckle setup, motorsport use, target front brake behavior, wheel package, tire compound, rear brake pairing, ABS / proportioning strategy, and whether the car uses OEM or custom front uprights.

2. Data Submission

For OEM knuckles, provide year, make, model, trim, current wheel size, intended use, and detailed wheel specifications. For custom uprights, motorsport hub conversions, or non-OE rotor offsets, 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 clearance, vehicle-specific caliper bracket geometry, rotor hat offset, brake line fittings, pad compound, and required fitment details before production begins.

If you are unsure whether your wheel, front knuckle, rotor offset, brake balance target, or brake line routing is suitable, Contact us before ordering so the engineering team can review the build details.

Installation & Break-In

TR48 uses radial-mount, vehicle-specific caliper brackets and vehicle-specific brake line fittings.
Choose Ø355 mm × 32 mm for lighter chassis, tight tracks, 18 in wheels, and lower thermal demand.
Choose Ø380 mm × 32 mm for heavier chassis, fast circuits, endurance use, and higher thermal headroom.
Standard 0–600 °C pads suit sprint sessions, HPDE, and dual-purpose street / track cars driven to events.
Option B 0–750 °C pads suit sustained high-temperature work, time attack, and endurance racing.
A proper bed-in cycle transfers an even layer of pad material onto the rotor face, sets initial friction, and prevents uneven deposits, vibration, and judder.
Complete the included bedding procedure before your first hard session.

Frequently Asked Questions

What is the TR48 designed for?

The TR48 is a front-axle 4-piston monoblock big brake kit built for circuit, time-attack, drift, and rally use. It targets thermal repeatability lap after lap, a stable pedal under load, and predictable brake balance when paired with a matched rear setup.

Which rotor size and pad compound should I choose?

Choose Ø355 mm × 32 mm for lighter cars, tight tracks, and 18 in wheels, or Ø380 mm × 32 mm for heavier chassis, fast circuits, and endurance heat loads. The standard pad runs 0–600 °C with avg μ 0.38; the racing-steel option runs 0–750 °C with avg μ 0.45 for sustained high-temp work.

What wheel clearance does the kit need?

Minimum 18 in wheels are required. Caliper envelope is 258.8 mm × 157.7 mm × 75.2 mm. Wheel barrel and spoke geometry vary, so confirm clearance against the caliper profile before ordering, especially with 380 mm rotors.

Are the rotors two-piece, and are they directional?

Yes. Rotors are two-piece assemblies, internally vented, with left/right specific directional vanes. Mounting is fixed or floating depending on rotor size and vehicle application. Face options include curved slot, grain slot, wave slot, and drilled-and-slotted; the racing-steel option ships wave slot.

Is a bedding-in procedure required?

Yes. A proper bed-in cycle is required to transfer pad material evenly to the rotor face, set initial friction, and prevent uneven deposits or judder. Follow the included procedure before any hard track sessions.

Can I get this kit for my specific vehicle?

Yes. The TR48 uses radial-mount, vehicle-specific caliper brackets and vehicle-specific brake line fittings. Send your year, make, model, trim, and wheel spec through our contact page and we will confirm the correct bracket, rotor size, and line kit.

Spec your TR48 build

Send your year, make, model, trim, current wheel size, and intended use. We will confirm rotor size, bracket geometry, line fittings, and pad compound for your application.

Brake 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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