Forged 4-Piston Caliper
Two-piece forged aluminum body with staggered 28/32 mm pistons. Heat-insulated, dust-booted pistons keep seal temperature down and modulation predictable lap after lap.
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Description
Evolution ES4 Rear Wheel 4-Piston Big Brake KitEvolution Series Rear Axle Platform Adapted BBK Evolution ES4 Rear 4 Piston Big Brake Kit The TTSPORT Evolution ES4 is a rear axle 4 piston big brake kit built to restore brake balance when the front axle has been upgraded. Forged aluminum calipers, staggered pistons, and two piece rotors deliver controlled rear bite, firmer pedal feel, and repeatable stopping power on street and track. Why Builders Choose the ES4 Forged 4 Piston Caliper Two piece
Evolution Series · Rear Axle · Platform-Adapted BBK
Evolution ES4 Rear 4-Piston Big Brake Kit
The TTSPORT Evolution ES4 is a rear-axle 4-piston big brake kit built to restore brake balance when the front axle has been upgraded. Forged aluminum calipers, staggered pistons, and two-piece rotors deliver controlled rear bite, firmer pedal feel, and repeatable stopping power on street and track.
Why Builders Choose the ES4
Rear-Tuned Piston Area
28.4 cm² total piston area per caliper is sized for rear-axle duty — enough clamp to contribute, not so much that it locks the rear or upsets ABS bias.
Two-Piece Rotor Options
Choose Ø345, 355, or 380 mm heat-treated high-carbon iron, or step up to a Ø380 mm carbon-ceramic floating rotor for maximum thermal capacity and reduced unsprung mass.
Pedal Confidence
PTFE / SUS304 braided lines eliminate hose swell so the pedal stays firm from cold stops to repeated heavy braking.
Technical Specifications & Kit Options
| Brake Caliper | ||
|---|---|---|
| Series | Evolution Series | |
| Model / Application | ES4 | |
| Axle Position | Rear | |
| Piston Count | 4-piston | |
| Piston Type | Two-piece heat-insulated pistons with dust boots | |
| Piston Diameter | 28 mm × 2 / 32 mm × 2 | |
| Total Piston Area | 28.4 cm² per caliper (all pistons combined) | |
| Caliper Dimensions | L 255 × W 139 × H 74 mm | |
| Manufacturing Process | Two-piece forged aluminum body | |
| Net Weight | 2.80 kg per caliper (without pads) | |
| Surface Finish | High-temperature gloss coating | |
| Recommended Wheel Size | 18 in or larger | |
| Recommended Rotor Size | Ø345–380 mm × 28 mm | |
| Brake Rotor Options | ||
| Rotor Option | Iron Rotor | Carbon-Ceramic Rotor |
| Rotor Material | Heat-treated high-carbon cast iron | Carbon-ceramic composite |
| Axle Position | Rear | Rear |
| Rotor Dimensions | Ø345 / 355 / 380 mm × 28 mm | Ø380 mm × 28 mm |
| Construction | Two-piece assembly | Two-piece assembly |
| Ventilation | Internally vented | Internally vented |
| Rotor Mounting | Fixed | Floating |
| Directional Design | Yes — left/right specific | Yes — left/right specific |
| Rotor Face Pattern | Curved slot / Grain slot / Wave slot / Drilled and slotted | Cross-drilled |
| Brake Pad Options | ||
| Pad Option | For Iron Rotors | For Carbon-Ceramic Rotors |
| Compatible Rotor Material | Iron / steel rotors only | Carbon-ceramic rotors only |
| Operating Temperature Range | 0–600 °C | 0–700 °C |
| Average Friction Coefficient | μ ≈ 0.38 | μ ≈ 0.45 |
| Lines | ||
| Brake Line Construction | Three-layer construction | |
| Brake Line Material | PTFE inner liner / SUS304 stainless braid / PVC protective sheath | |
| Brake Line Function | Eliminates hose expansion under heavy pedal pressure | |
| Brake-Line Fittings | Caliper-side and chassis-side selected per 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 | 90 mm | |
| Recommended Wheel Size | 18 in or larger | |
| Brake Bias Note | Pair with a matched front BBK to maintain proper brake bias | |
| Bedding-In Procedure | Required before aggressive use | |
Friction values vary with temperature, line pressure, and rotor condition. Pads must be matched to rotor material — never run iron-rotor pads on carbon-ceramic discs or vice versa.
Package List
Calipers ×2
2 × ES4 forged 4-piston rear calipers with pistons and dust boots
Brake Pads
1 set performance brake pads matched to rotor material
Brake Rotors ×2
2 × Two-piece directional rotors, iron or carbon-ceramic, size selected
Caliper Brackets ×2
2 × CNC-machined carbon-steel caliper brackets
Rotor Hats ×2
2 × CNC-machined aluminum rotor hats
Brake Hoses ×2
Stainless-steel braided brake lines with application-specific fittings
Mounting hardware is included.
Will It Fit? Your 3-Step Check
Wheel clearance must be verified before ordering — barrel shape, spoke profile, and offset all affect fit.
1. Wheel Diameter
Recommended wheel size 18 in or larger.
2. Spoke Clearance
Minimum spoke clearance: 90 mm.
3. Vehicle Model
Confirm caliper mounting, brake-line fittings, front brake setup, and balanced front-axle pairing before ordering.
Send wheel specs or a template trace before ordering if you're unsure.
Installation & Break-In
- Caliper mounting: radial mount with vehicle-specific brackets.
- Brake-line fittings: caliper-side and chassis-side selected per application.
- Bedding-in procedure required before aggressive use.
- Pair with a matched front BBK to maintain proper brake bias.
- A proper bed-in cycle transfers an even pad layer onto the rotor face, which is essential for full bite, modulation, and resistance to judder.
Frequently Asked Questions
Can the ES4 be used as a standalone rear upgrade?
The ES4 is designed to rebalance an upgraded brake system. Running it alone behind a stock front setup can shift bias rearward. Pair it with a matched TTSPORT front BBK or confirm your existing front capacity supports the change.
Which rotor size should I choose?
Pick the largest size that fits inside your wheel with the required 90 mm spoke clearance. Larger rotors add thermal capacity and leverage; smaller rotors save weight and clear tighter wheels.
Iron or carbon-ceramic rotors?
Heat-treated high-carbon iron rotors are the right call for street, canyon, and most track use. Carbon-ceramic is for owners who want maximum thermal headroom, lower unsprung mass, and longer rotor life on dedicated builds.
What wheel size do I need?
18 in or larger, with at least 90 mm of spoke clearance. Send wheel specs or a template trace before ordering if you're unsure.
Is bedding-in required?
Yes. A proper bed-in cycle transfers an even pad layer onto the rotor face, which is essential for full bite, modulation, and resistance to judder.
Are custom caliper colors available?
Yes — custom finishes are available on the ES4. Reach out before ordering to confirm color, logo, and lead time.
Ready to spec your ES4 build?
Send your vehicle, wheel specs, and current front brake setup. Our team will confirm ES4 rear fitment and recommend a balanced front-axle pairing.
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
4.6 ★★★★★
Based on 20 reviews
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Product Reviews
★★★★★ 4
Fun with a late blooming omega
Format: Kindle
I like this book. The story is fun, cute, and sexy. There's just a little drama, some excellent, steamy scenes, and a fairly good relationship building storyline. I especially like how all the main characters are a bit older than the usual 20 somethings I tend to see in this kind of book.
Having said that, I wish there were more descriptions of the places, as well as the food in the fancy restaurant. I enjoyed the cocktails at the club, so I missed that kind of detail when Gray took Madison on a dinner date. I also wish there had been more interaction between Lucas and Madison, and Lucas and Rian. It felt a bit lopsided, with a focus on Rian, Madison, and Gray.
I wish it had been proofread - there are a lot of typos, but nothing too distracting.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 12, 2022
★★★★★ 3
Madison Deserved Better
Format: Kindle
Madison was a beta...except she wasn't any longer. She was a late presenting Omega. And she was struggling. She was tall and thin, not tiny and curvy. She was opinionated. She was everything an Omega was not. After suffering through her first heat, her friends took her to Ardor, a club where Omegas came to safely find Alphas. She's not expecting much but then she connects with a sexy beta. And when she meets his Alphas, they set her body on fire. Maybe, she's found her no-strings-attached heat pack. Maybe, she's found something more.
I could not connect with the characters in this book, so their story never resonated with me. And there was no love story; there was sex. Grey made it clear from the beginning that he had a true love and it was his beta boy, Rian. He went so far as to reassure Rian “Say the word, I’ll never touch her again. Lucas can put the babies in her. I only need you, beta boy”. So, Madison was there for babies, no emotions needed. Nice. No, thank you. I want the Omega to be the center of their world, not an incubator. Lucas and Rian weren't any better. After her heat, they let her leave. Not one of them made her feel valued. No one gave her a reason to stay or even offered a cuddle. And the sex didn't even come across as mind-blowing. Madison deserved better.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 11, 2025
★★★★★ 5
No breakup, very sweet, instalove
Format: Kindle
Omegaverse and doesn't disappoint! Sweet guys, newly Omega FMC. The boyfriends are boyfriends. What's not to love? No angst, no breakup.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 23, 2025
★★★★★ 4
Pretty Darn Good
Format: Kindle
So I’ve been on a omega kick and this definitely hit the spot. Madison was frustrating at times with how she acted towards Lucas, Gray, and Rian. It was like she said towards the end, she didn’t believe she deserved nice things.
It would have been nice to hear from her best friends again. They kind of were there in the beginning and the gone except for mention of text messages received from them. I feel like her friends would have been great help in encouraging Madison to go with the pack and never give Brent another chance because he was toxic.
I loved Rian. His personality was awesome. His humor. His ability to make Madison comfortable whenever she was feeling overwhelmed. And the fact he fell for her and she fell for him first. They are cute together.
I do feel like Lucas was the odd man out though. Like Lucas didn’t develop as much of a relationship with Madison. I would have really liked to see more development in the relationship between them. It was also the same with him and Rian. There is really no relationship displayed. Most of the relationship being displayed is between Rian and Gray.
Nevertheless, I loved reading about the dynamic that came to fruition during the entirety of this story. Madison finally got her happiness. And Brent finally got punched in the face. Everyone got exactly what they deserve.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 6, 2022
★★★★★ 3
Pack's Promise was okay but not great
Format: Kindle
Pack's Promise was okay but not great. I won't recommend it to anyone that I know.
PRO:
* Very likable characters
* Lots of steamy scenes that are written very well
* The spelling and grammar are good
* The punctuation is good with the exception of using hyphens instead of commas. Lots of hyphens. Lots and lots of hyphens.
CON:
* Almost no interactions with any characters outside of Madison and the pack
* Nearly no plot. They meet, get together for a heat, agree to make it permanent, done
* Quite a few typos such as extraneous words, missing words and words out of order
THINGS TO KNOW:
* More steamy scenes than storytelling
* A lot of MM & MMM, some MFMM during heat
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 5, 2023
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