Monoblock Forged Aluminum Body
High stiffness, low mass, and minimal caliper deflection at high line pressure.
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Description
Circuit Racing TR40 Front Wheel 4-Piston Big Brake KitRacing Series Circuit Front Axle 4 Piston TR40 Front 4 Piston Racing Big Brake Kit The TR40 is a front axle 4 piston racing big brake kit built for circuit, time attack, drift, rally, and endurance cars that need repeatable torque, stable pedal feel, and a predictable pad window under sustained heat. Forged monoblock construction, staggered piston bore, and a two piece 28 mm iron rotor package give the driver a clean signal at threshold braking
Racing Series · Circuit · Front Axle · 4-Piston
TR40 Front 4-Piston Racing Big Brake Kit
The TR40 is a front-axle 4-piston racing big brake kit built for circuit, time attack, drift, rally, and endurance cars that need repeatable torque, stable pedal feel, and a predictable pad window under sustained heat. Forged monoblock construction, staggered piston bore, and a two-piece 28 mm iron rotor package give the driver a clean signal at threshold braking instead of caliper flex and pedal drift.
Why Builders Choose the TR40
The TR40 is engineered for track cars that need a lightweight front brake package with real motorsport service logic. It combines a monoblock forged aluminum body, staggered 36 / 41.3 mm pistons, racing pistons without dust boots, two-piece Ø330 / 345 mm rotors, pad compound options, and PTFE / SUS304 braided lines for repeatable braking under sustained pressure.
Staggered 36 / 41.3 mm Pistons
Biases pad pressure toward the trailing edge for even pad wear and consistent torque.
Racing Pistons Without Dust Boots
Built for inspected, serviced race cars; sheds heat instead of trapping it.
Two-Piece Rotor Platform
Ø330 / 345 mm × 28 mm heat-treated high-carbon iron rotors, internally vented and left/right specific.
Pad Compound Options
Choose 0–600 °C street / track pads or 0–750 °C race compound to match your event and rotor package.
Vehicle-Specific Engineering
Bracket geometry, rotor diameter, brake line routing, and pad window are specified around the actual build.
Technical Specifications & Kit Options
| Brake Caliper | ||
|---|---|---|
| Series | Racing Series — Circuit | |
| Model / Application | TR40 | |
| Axle Position | Front | |
| Piston Count | 4-piston | |
| Piston Type | Racing pistons without dust boots | |
| Piston Diameter | 36 mm × 2 / 41.3 mm × 2 | |
| Caliper Dimensions | 284 mm × 152.8 mm × 77.3 mm | |
| Total Piston Area | 47.12 cm² per caliper, all pistons combined | |
| Manufacturing Process | Monoblock 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 | Ø330–345 mm × 28 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 | Ø330 / 345 mm × 28 mm | Ø330 / 345 mm × 28 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 & Slotted | Wave Slot |
| Recommended Use | Mixed street / track, sprint use, and lower sustained heat demand | Sustained circuit, time attack, endurance, and higher heat cycles |
| Brake Pad Options | ||
| Pad Option | Standard | Option B Race |
| 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, varies with temperature, line pressure, and rotor condition | μ ≈ 0.45, varies with temperature, line pressure, and rotor condition |
| Recommended Use | Street / track, HPDE, sprint sessions, and lighter heat load | Time attack, endurance, sustained circuit use, and higher temperature windows |
| Lines, Brackets & Service | ||
| Brake Line Construction | Three-layer reinforced | |
| Brake Line Material | PTFE inner liner / SUS304 stainless braid / PVC protective outer sheath | |
| Caliper Mounting | Radial mount with vehicle-specific caliper brackets | |
| Caliper Brackets | Vehicle-specific radial caliper brackets | |
| Rotor Hats | Application-specific alloy rotor hats matched to front hub geometry and rotor offset | |
| Brake Line Fittings | Vehicle-specific; caliper-side and chassis-side fittings vary by application | |
| Wheel Clearance | 17 in or larger wheel required; final clearance depends on wheel offset, barrel profile, spoke shape, rotor diameter, and bracket package | |
| Brake Balance | Rear setup may require pad compound changes, proportioning valve adjustment, or a matched rear upgrade depending on the build | |
| Bedding-In Procedure | Required before first hot lap | |
Pad selection should match your event temperature window, rotor compound, chassis weight, rear axle setup, and intended use. Ask us before ordering if you are unsure.
Package List
Calipers ×2
2 × TR40 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 Race 0–750 °C compound.
Brake Rotors ×2
2 × two-piece internally vented front rotors, selected from Ø330 or Ø345 mm × 28 mm, left/right specific.
Caliper Brackets ×2
Vehicle-specific radial caliper brackets for correct front caliper position and alignment.
Rotor Hats ×2
Application-specific alloy rotor hats matched to front hub location and rotor offset.
Brake Hoses ×2
Three-layer stainless-steel braided front brake lines with PTFE inner liner, SUS304 stainless braid, and PVC protective outer sheath.
The Bespoke Engineering Process
Every TR40 front 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, rear axle setup, master cylinder, tire package, 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 under sustained heat.
1. Technical Consultation
We review the chassis, front suspension and knuckle setup, event type, wheel size, tire, pad preference, master cylinder, rear axle setup, target brake behavior, and whether the car uses OEM or custom front uprights.
2. Data Submission
For OEM knuckles, provide vehicle details, wheel specs, tire setup, event type, master cylinder information, and current rear brake setup. 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 diameter, pad compound, vehicle-specific caliper bracket geometry, rotor hat offset, brake line fittings, wheel clearance, and front/rear balance before manufacturing begins.
If you are unsure whether your wheel, front knuckle, rotor offset, rear axle setup, master cylinder, or brake balance target is suitable, Contact us before ordering so the engineering team can review the build details.
Installation & Break-In
- TR40 is a front-axle kit built around vehicle-specific radial caliper brackets, rotor hats, and brake line fittings.
- Send wheel size, tire, pad preference, event type, master cylinder, and any rear axle changes before production.
- If you are upgrading the front only, rear bias may shift and could require pad compound changes, a proportioning valve adjustment, or a matched rear upgrade.
- Choose Standard 0–600 °C pads with curved / grain / wave / drilled rotors for mixed street and track use.
- Choose Option B 0–750 °C race pads with wave-slot racing-grade rotors for sustained circuit, time attack, and endurance use.
- Racing pistons without dust boots are intended for inspected, serviced race cars.
- A proper bedding-in cycle is required before the first hot lap to transfer pad material evenly and stabilize brake torque.
Frequently Asked Questions
Is the TR40 a true motorsport caliper or a street BBK?
It is a motorsport-focused 4-piston front kit. Pistons are racing-spec without dust boots, so the kit assumes regular inspection and service typical of a track or race car.
Will it fit my wheels?
Minimum 17 in wheel is required, and exact clearance depends on wheel offset and spoke profile. Send wheel specs and TTSPORT will confirm before production.
Which rotor and pad option should I pick?
Standard 0–600 °C pads with curved / grain / wave / drilled rotors suit mixed street and track use. Option B with 0–750 °C race pads and wave-slot racing-grade rotors is for sustained circuit, time attack, and endurance use.
Do I need to upgrade the rear at the same time?
Not always, but front-only upgrades shift bias forward. TTSPORT will review your rear setup and recommend a pad change, proportioning valve adjustment, or matched rear kit if needed.
How is fitment handled?
Each TR40 kit is engineered to the chassis: brackets, rotor diameter, line fittings, and pad window are specified for your build. Vehicle, wheel, and use-case info are required before manufacturing.
Is bedding-in really required?
Yes. Iron rotors and race pads need a proper bed-in cycle to transfer pad material evenly. Skipping it causes judder, glazing, and inconsistent torque.
Ready to spec your TR40 build?
Send your chassis, wheel, tire, event type, master cylinder, and current brake setup. TTSPORT will quote rotor size, pad compound, caliper bracket geometry, rotor hat offset, and line fittings for your car.
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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★★★★★ 3
A familiar story, just with…..less.
Format: Kindle
So, as other reviewers make clear, this is very similar to Pack Darling and The Beta. It’s much closer aligned with The Beta, in plot and maybe more like Pack Darling with characters.
That being said, I don’t hate this…..but it wasn’t great either. It’s both books mentioned but just….less. Less angst, less emotion, less feeling. The plot feels very half fleshed out, and the “bad guy” feels underwhelming. I didn’t really feel any real emotions from and of the male leads, except maybe Oliver. The others fell sorta flat for me. And Mika makes herself out to be this big bad ass straight outta training and then we never see it from here again with the one fitting room incident as the exception.
SPOILER:
The whole, “Oh, I’m actually probably an Omega, but I don’t wanna be but I do actually wanna be but no one can ever know my secret that I do nothing to hide “ thing fell so flat. She never commutes to believing she was secretly an omega, but also mentions her “secret” a lot. It just felt so manufactured.
I’m intrigued enough to read part 2 and see how the author closes everything out, but this is not one I’ll recommend or ever come back to.
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Reviewed in the United States on February 13, 2024
★★★★★ 5
A good read
Format: Kindle
A good read, just fluffy cuteness, no antagonism. I like all the characters. It could have used another round of editing however, glanfds being one error that cracked me up, and my personal pet peeve was that the author kept using the word fill instead of feel, which I promise you are not interchangeable haha, but it's definitely better than the majority of books I read on here mistake-wise.
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Reviewed in the United States on November 28, 2024
★★★★★ 4
amazing
Format: Kindle
Knot the Bride was a fantastic read! The characters were all amazing and well-developed. It was easy to like them all. Sophia, Luca, Nick, and Gavin were all perfect for each other. It was such a charming story that had me hooked the entire time. I did wish there were POVs from Luca, Nick, and Gavin but it was still an amazing book without it.
I am excited to read the next book in the Willowside Omegaverse series! This is definitely a must-read for fans of omegaverse romance!.
I received a free copy of this book and am voluntarily leaving a review.
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Reviewed in the United States on April 25, 2025
★★★★★ 3
3 Star Read,
Format: Kindle
This book wasn't bad, but wasn't my cup of tea. It's highly disappointing because the storyline is so original. There is no real conflict or resolution, so the entire thing feels flat.
As a lover of omegaverse books, I know there is a ton of variety out there, and ov is really up to the author. But this one is weird. Omegas have multiple scent glands all over their bodies and go into week long heats every month. Alphas have knots in the middle of their shaft instead of the base, and the knot doesn't always swell, no explanation of when or why. It doesn't engage at all when the mouth is in play.
I also didn't enjoy the author's writing style. Each paragraph is only 1 or 2 sentences long, and the entire book reads very stacato. The conversations are stiff and unnatural feeling. Everything is very repetitive, both in word choice and in thought. The same thing is repeated 3 or 4 times over a single page, multiple times over. I ended up doing so much skimming.
The first 50% of the book is all slow burn, and the last 50% is almost straight mediocre spice. This wouldn't have been all bad if the grammar and spelling errors didn't start at the exact same time. Tongue is repeatedly misspelled in the middle of the spice.
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Reviewed in the United States on September 14, 2024
★★★★★ 5
Cozy Omegaverse
Format: Kindle
This is the true definition of Cozy Omegaverse. LA wedding coordinator meets her pack at the location for a couple’s destination wedding. Low angst because they are scent matched high heat with heats and knots. Everything you love about this genre with very little anxiety. Simply a fun experience to read and a book I will comeback to when I’m in a slump. I simply love reading this book
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Reviewed in the United States on March 19, 2026