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
4.0 ★★★★★
Based on 27 reviews
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Product Reviews
★★★★★ 4
Enchanting
Format: Kindle
"Queen of Roses" by Briar Boleyn is a delightful and refreshing reimagining of the classic tale of King Arthur, with a captivating twist that places the spotlight on Morgan, a character who has often been overshadowed in traditional retellings. Boleyn's creative decision to shift the narrative perspective to Morgan breathes new life into the story, offering readers an intriguing and compelling look at the Arthurian world from an entirely different angle.
One of the most commendable aspects of this book is its incorporation of Fae elements, which adds an enchanting layer of magic and mystery to the already familiar Arthurian setting. Boleyn skillfully weaves the world of the Fae into the narrative, creating a captivating backdrop against which the events of the story unfold. This addition not only adds depth to the world-building but also provides ample opportunities for twists and turns that keep readers thoroughly engrossed.
However, while the book boasts numerous strengths, it does have one noticeable flaw: the characterization of Morgan. While it is reasonable to create a flawed and complex protagonist, it appears that at times, Morgan's character becomes overly difficult and hard to relate to. Her persistently negative perception of one of the main male characters, who is a potential love interest, despite his efforts to support and assist her, may come across as somewhat irrational and could test the patience of some readers. Striking a balance between a strong, independent character and one who can recognize genuine support and affection could have enhanced the overall reader experience.
Nonetheless, the allure of "Queen of Roses" lies in its innovative approach to the Arthurian legend and its skillful blending of fantasy elements into a familiar narrative. Boleyn's evocative prose draws readers into a world where magic, destiny, and fate entwine, leaving us eager to uncover the mysteries that unfold within the pages.
I received a free copy of this book via Booksprout and am voluntarily leaving a review.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 28, 2023
★★★★★ 5
An action-packed dark romantasy
Format: Kindle
I loved this book! Queen of Roses is an Arthurian-inspired dark romantasy that is the first book in the Blood of Fae series. The story follows Morgan, the princess of Camelot who is rumored to be part fae. Fueled by prejudiced hatred and a mistrust of fae blood, Morgan’s abusive father strips her of her birthright and hands it to her half-brother, Arthur. Instead of becoming queen, Morgan is commanded to join the temple of the goddesses when she comes of age.
However, Arthur turns into a psychopathic, power-hungry, fae-hating king as he ages. He develops malevolent plans and commands Morgan to find an ancient weapon with legendary power. Although Morgan is wary of Arthur’s intentions, she embraces the opportunity to go on a journey and potentially change her fate.
The story picks up from there and we follow Morgan on her quest to find the ancient relic. It’s full of high stakes adventure, mystery, tension, banter, forced proximity, hidden magic, self discovery, and betrayal. This first installment of the series intricately develops the world building and character development. There’s little romance in this book, but it is evident that it is a slow burn that will continue to develop throughout the remainder of the series.
Overall, I loved the world building, the epic fantasy, Morgan’s journey of self discovery, and all of the twists and turns that set the stage for the future installments. I can’t wait to see what happens next!
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Reviewed in the United States on April 7, 2024
★★★★★ 4
Arthurian Fae Quest…say less.
Format: Kindle
A fae centered Arthurian tale unlike any I’ve read so far. The author did a great job at descriptive world building, with scenes easily playing out in my minds eye. There was plenty of action, suspense, and even a touch of horror. An enemies to lovers, slow burn romance, a quest, with plot twist and turns aplenty. There was a love triangle, which I’m not usually a fan of but, it played out well in this story line. The FMC, Morgan Pendragon, was so blatantly naïve, yet I typically expect as much in a ‘book one’ of a series, especially one that features a fairly sheltered princess. I was happy to read that in spite of this, she still showed a strong sense of morals, fire, and spine. Now our MMC? Kairos Draven, aka Void’s Edge. Oh, how I’m a sucker for a smoking’ hot grumpy warrior alpha with a witty mouth, and a strong sense of “touch her and die” attitude, so you know who held all my cards. That ending? Just made me swoon all the harder. Now add a battlecat that rivals the size of a horse…and well Ms. Briar Boleyn you have well and truly stolen my heart. I’m excited to see where the story goes from here, and follow along to see more of the characters growth. I went into this story fairly blind, and I think I enjoyed it all the more because of it.
Once the story got going, it had me in an absolute chokehold and it was difficult to put down.
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Reviewed in the United States on May 12, 2024
★★★★★ 3
Not a bad start
Format: Kindle
3 stars
Thank you Netgalley and Briar Boleyn for the ARC!
A camelot/king Arthur retelling with fae. I was hooked by the idea of this book immediately and was eager to jump into this world.
• slow burn
• enemies to lovers
• who did this to you
Morgan Pendragon watched her mother die by her father's hand when she was just eight years old, hiding under the bed. Morgan is believed to have the tainted blood of the fae in her veins and is cast aside so that her fathers illegitimate son, Arthur, can become the king. She's seen his cruel treatment of the fae firsthand, so when he sends her on a journey to find a fae weapon she seizes the opportunity to do more with her life. Along the way, she finds more than she could have imagined.
I don't know a whole lot about King Arthur and Camelot but I had a lot of fun with this story! The plot has some similar tropes to popular romantasy books (From blood and ash) but there's enough originality here that it doesn't feel like I'm reading a copy. I liked how the fae were different in appearance than what is typical in most fantasy books I've read. In this book they have blue hair, violet skin and a wide range of other characteristics. I thought that the world building was easy to follow and I could easily immerse myself into this world. After reading the blurb I kept wondering when she was going to go on the journey to find Excalibur and it doesn't happen until around the 45% mark.
The story is a bit slow at times but starts to pick up once they begin their journey to find Excalibur. The John Wick style Inn was a fun concept that I enjoyed reading about.
There are a lot of similarities to this and FBAA and I would have liked to have it be a little more different, but I'm hoping book two will have the story turn into something of its own. Overall I enjoyed reading this story and I'm looking forward to reading book two especially after that ending.
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Reviewed in the United States on May 27, 2023
★★★★★ 5
Unraveling Fate and Fae: A Captivating Journey in "Queen of Roses"
Format: Kindle
"Queen of Roses" by Briar Boleyn is a dark fantasy romance that masterfully combines elements of myth, magic, and romance with a captivating King Arthur retelling infused with a Fae twist. From its intricately woven plot to its compelling characters, this novel delivers an immersive reading experience that will leave readers eagerly anticipating the next installment.
At its core, "Queen of Roses" is an enchanting tale of forbidden love and destiny, featuring an exceptionally slow-burn romance that ignites with the intensity of an enemies-to-lovers trope. Against a backdrop of magic and mythical creatures, the story unfolds with tension, banter, and forced proximity, drawing readers into a world filled with love, friendships, self-discovery, and betrayal.
While the novel excels in world-building, character development, and plot intricacies, some readers may yearn for a bit more fire and spice in certain aspects of the narrative. However, the promise of future developments in the series offers hope for an even more dynamic and engaging story to come. I know I personally cannot wait to get into book 2.
With a cliffhanger ending that leaves hearts racing and minds reeling, "Queen of Roses" succeeds in immersing readers from start to finish. Its dark and twisted fantasy elements are expertly balanced with moments of adventure, action, and unexpected twists, keeping readers on the edge of their seats until the very last page.
As the story delves into complex themes and explores the depths of its characters' struggles and desires, it's important to note that "Queen of Roses" may contain triggering content. Readers are advised to check the trigger warnings before diving into this captivating tale.
Overall, "Queen of Roses" is a must-read for fans of dark fantasy romance, offering a mesmerizing journey that will leave readers eagerly anticipating the next chapter in the series. With its lush prose, intricate storytelling, and unforgettable characters, this novel is sure to leave a lasting impression on all who venture into its enchanted world.
I want to extend a heartfelt shoutout to the author for granting me the opportunity to dive into "Queen of Roses" through NetGalley. It has been an absolute pleasure to explore the captivating world and characters crafted with such skill and imagination. Thank you for entrusting me with this glimpse into your enchanting world.
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Reviewed in the United States on April 1, 2024