Forged 4-Piston Caliper
Two-piece forged aluminum body keeps caliper deflection low under high line pressure, so pedal travel stays short and predictable lap after lap.
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Description
Classic 5440 Front Wheel 4-Piston Big Brake KitClassic Series Front Axle 4 Piston Classic 5440 Front 4 Piston Big Brake Kit The TTSPORT Classic 5440 is a front axle 4 piston big brake kit built for drivers who want stronger initial bite, firmer pedal feel, and repeatable stopping power under heavy or repeated use. Two piece forged aluminum calipers, staggered 38 41 mm pistons, and two piece vented iron rotors work together to raise thermal capacity and tighten modulation versus an undersized
Classic Series · Front Axle · 4-Piston
Classic 5440 Front 4-Piston Big Brake Kit
The TTSPORT Classic 5440 is a front-axle 4-piston big brake kit built for drivers who want stronger initial bite, firmer pedal feel, and repeatable stopping power under heavy or repeated use. Two-piece forged aluminum calipers, staggered 38/41 mm pistons, and two-piece vented iron rotors work together to raise thermal capacity and tighten modulation versus an undersized factory setup.
Why Builders Choose the 5440
Staggered Piston Bores
38 mm × 2 leading and 41 mm × 2 trailing pistons load the pad evenly across the rotor face, reducing taper wear and helping bite stay consistent as the pad heats up.
Two-Piece Vented Rotors
Heat-treated high-carbon iron, internally vented, in Ø330 or Ø345 mm × 28 mm. Directional left/right design with curved-slot, grain-slot, wave-slot, or drilled-and-slotted faces.
Stainless Braided Lines
PTFE inner liner, SUS304 stainless braid, PVC outer sheath. Reduces line expansion for a firmer, more linear pedal under hard braking.
Technical Specifications & Kit Options
| Brake Caliper | ||
|---|---|---|
| Series | Classic Series | |
| Model / Application | 5440 | |
| Axle Position | Front | |
| Piston Count | 4-piston | |
| Piston Type | Star-profile racing pistons, no dust boots | |
| Piston Diameter | 38 mm × 2 / 41 mm × 2 | |
| Total Piston Area | 49.1 cm² per caliper (all pistons combined) | |
| Caliper Dimensions | L 276 × W 138 × H 80 mm | |
| Manufacturing Process | Two-piece forged aluminum body | |
| Net Weight | 2.65 kg per caliper (without pads) | |
| Surface Finish | High-temperature gloss coating | |
| Recommended Wheel Size | 17 in or larger | |
| Recommended Rotor Size | Ø330–345 mm × 28 mm | |
| Brake Rotor Options | ||
| Rotor Option | 330 mm Rotor | 345 mm Rotor |
| Rotor Material | Heat-treated high-carbon cast iron | Heat-treated high-carbon cast iron |
| Axle Position | Front | Front |
| Rotor Dimensions | Ø330 mm × 28 mm | Ø345 mm × 28 mm |
| Construction | Two-piece, internally vented, fixed | Two-piece, internally vented, fixed |
| Directional Design | Yes — left/right specific | Yes — left/right specific |
| Rotor Face Pattern | Curved slot / Grain slot / Wave slot / Drilled & slotted | Curved slot / Grain slot / Wave slot / Drilled & slotted |
| Brake Pads | ||
| Compatible Rotor Material | Iron / steel rotors only | |
| Operating Temperature Range | 0–600 °C | |
| Average Friction Coefficient | 0.38 (varies with temp, line pressure, rotor condition) | |
| Lines | ||
| Brake Line Construction | Three-layer construction | |
| Brake Line Material | PTFE inner / SUS304 braid / PVC outer sheath | |
| Brake Line Fittings | Vehicle-specific; caliper-side and chassis-side vary by application | |
| Brackets | ||
| Rotor Hat Manufacturing Process | CNC-machined | |
| Rotor Hat Material | High-strength aluminum alloy | |
| Caliper Bracket Manufacturing Process | CNC-machined | |
| Caliper Bracket Material | Carbon steel | |
| Caliper Mounting Type | Radial mount with vehicle-specific brackets | |
| Fitment & Installation | ||
| Minimum Spoke Clearance | 86 mm | |
| Recommended Wheel Size | 17 in or larger | |
| Rotor Diameter Selection | 330 or 345 mm, selected according to vehicle application and wheel clearance | |
| Bedding-In Procedure | Required before hard use | |
This is a performance brake system with star-profile racing pistons and no dust boots. For daily-driven cars — especially in wet, dusty, salted, or high-debris environments — inspect and clean the caliper area more frequently as part of normal maintenance.
Package List
Calipers ×2
Two Classic 5440 forged 4-piston front calipers.
Brake Pads
Complete brake pad set for both front calipers.
Brake Rotors ×2
Two two-piece front rotors in your selected 330 mm or 345 mm size.
Caliper Brackets ×2
Two CNC carbon-steel vehicle-specific caliper mounting brackets.
Rotor Hats ×2
Two CNC-machined high-strength aluminum alloy rotor hats.
Brake Hoses ×2
Two stainless braided brake hoses with vehicle-specific fittings.
Mounting hardware is included.
Will It Fit? Your 3-Step Check
The 5440 caliper requires a minimum 86 mm spoke clearance and a 17-inch or larger wheel. Always verify spoke profile, barrel shape, and offset against the caliper envelope before purchase. Caliper brackets and brake-line fittings are vehicle-specific.
1. Wheel Diameter
17-inch or larger wheels are required.
2. Spoke Clearance
Minimum spoke clearance is 86 mm. Spoke shape and offset matter as much as diameter.
3. Vehicle Model
The 5440 is a platform-adapted big brake kit. Caliper brackets and brake-line fittings are built for your specific vehicle. Confirm fitment with our team before ordering.
Need a fitment confirmation for your vehicle and wheel? Send your year/make/model and wheel specs to our team before ordering.
Installation & Break-In
- Caliper mounting uses radial mount with vehicle-specific brackets.
- Brake-line fittings are vehicle-specific on the caliper side and chassis side.
- Forged body and stainless lines keep system compliance low, so pedal pressure tracks linearly with deceleration.
- Two-piece vented iron rotors at 28 mm thickness shed heat across repeated stops, helping resist fade on canyon, track, or towing duty.
- A proper bedding-in procedure is required before hard use.
- Inspect and clean the caliper area more frequently in wet, dusty, salted, or high-debris environments.
Frequently Asked Questions
Will the 5440 caliper fit my wheels?
The caliper requires a minimum 86 mm spoke clearance and a 17-inch or larger wheel. Spoke shape and offset matter as much as diameter — confirm with a clearance check or contact us with your wheel specs.
What rotor size should I choose, 330 mm or 345 mm?
Both run 28 mm thickness. The 345 mm rotor adds thermal mass and leverage for heavier vehicles or repeated heavy braking; the 330 mm fits more wheels and is the lighter option for lighter cars.
Are the pads street-friendly?
The included pads operate from 0–600 °C with an average μ of 0.38, so they work cold on the street and continue to perform under track or canyon use. They are compatible with iron/steel rotors only.
Why are the pistons exposed without dust boots?
Star-profile racing pistons reduce heat transfer into the caliper during repeated hard braking. The trade-off is more frequent caliper cleaning in wet, dusty, or salted environments.
Is this a direct bolt-on kit?
The 5440 is a platform-adapted big brake kit. Caliper brackets and brake-line fittings are built for your specific vehicle. Confirm fitment with our team before ordering.
Do I need to bed in the brakes?
Yes. A proper bedding-in procedure is required to transfer pad material evenly to the rotor face and establish full bite, modulation, and fade resistance.
Ready to spec your 5440 build?
Send your vehicle, wheel size, and intended use. We'll confirm caliper clearance, rotor size, and bracket availability before you check out.
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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★★★★★ 5
They fit perfect and are super comfy
Size: Large, Color: (001) Black / / White
Very soft and comfy! They are not the thickest to wear during a brutal winter, but they are warm. These are true to size (as recommended by my Amazon account). I loved these pants so much that I got me two more. They look great!
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Reviewed in the United States on February 15, 2026
★★★★★ 5
High quality, good fit
Size: XX-Large, Color: (001) Black / / White
These fit perfectly, not super baggy and lose but definitely not tight. I have larger knees so sometimes tapered legs are too tight on my knees but these are perfect. Waistband is perfect. Thickness is not too hot or too cold. Soft and breathable.
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Reviewed in the United States on May 30, 2026
★★★★★ 5
UA finally got the Tall size right!
Size: Small Tall, Color: (001) Black / / White
I'm 5'7" and 130 pounds. This is second time I've bought joggers from UA, size Small Tall, and OMG I couldn't be happier! UA FINALLY(!) got the Tall size right with these...the first pair I ordered about two years ago were supposedly Tall but shrunk up as soon as I washed and dried them. I like them to hit my ankles and not everyone is 5'4". Flattering fit - these sit at my belly button (not too low not too high) and are fitted not bulky. Material is heavier weight, well made, deep pockets, and perfect for Fall & Winter. After washing and drying with no shrinkage, I ordered another pair while still on sale.
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Reviewed in the United States on February 11, 2026
★★★★★ 5
good quality
Size: X-Small, Color: Black (001)/White
keeps me warm during the cold months when i play golf. tight enough to move around in but not tight at all around the neck. overall a really great product. has kept up for the last 4 years very well
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Reviewed in the United States on May 19, 2026
★★★★★ 5
Fit and Length
Size: X-Large, Color: (401) Royal / / White
Yeah this fits perfectly. Very soft, the color pops, keeps you warm. I use these under my sweatshirts, cable sweaters, and my flannel shirts. For me it's about the arm length and how well the item contours to the body to help with warmth. Thank you for getting this right.
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Reviewed in the United States on February 23, 2026