4 Hydraulic Pistons + EPB Actuator
Four 28 mm hydraulic pistons drive the pads, paired with a 27 mm EPB actuator piston that retains the factory electronic parking brake.
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- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Aug 9 - Aug 14
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Description
Evolution EP4S Rear Wheel 4-Piston Big Brake KitEvolution Series Rear Axle EPB Compatible BBK Evolution EP4S Rear Big Brake Kit with Electronic Parking Brake The Evolution EP4S is a rear axle big brake kit built for modern platforms that still require an electronic parking brake. Four hydraulic service pistons handle stopping work, while a dedicated EPB actuator piston preserves factory parking brake function so you get real rear axle thermal capacity without losing OE convenience. Why Builders
Evolution Series · Rear Axle · EPB-Compatible BBK
Evolution EP4S Rear Big Brake Kit with Electronic Parking Brake
The Evolution EP4S is a rear-axle big brake kit built for modern platforms that still require an electronic parking brake. Four hydraulic service pistons handle stopping work, while a dedicated EPB actuator piston preserves factory parking-brake function — so you get real rear-axle thermal capacity without losing OE convenience.
Why Builders Choose the EP4S
Two-Piece Forged Aluminum Body
The EP4S caliper is machined from a two-piece forged aluminum body for high stiffness at low weight, 4.50 kg per caliper without pads.
Rear-Axle Thermal Capacity
Two-piece rotor assemblies with CNC-machined aluminum hats keep unsprung and rotating mass in check while delivering the heat capacity a performance rear axle needs.
Matched Iron or CCB Pads
Iron rotors are paired with a street/track pad rated 0–600 °C with average μ ≈ 0.38. Carbon-ceramic rotors ship with a CCB-specific pad rated 0–700 °C with average μ ≈ 0.45.
Technical Specifications & Kit Options
| Brake Caliper | ||
|---|---|---|
| Series | Evolution Series | |
| Model / Application | EP4S | |
| Axle Position | Rear | |
| Piston Count | 4 hydraulic + 1 EPB actuator | |
| Piston Type | Two-piece heat-insulated, dust boots + EPB actuator | |
| Piston Diameter | 28 mm × 4 / 27 mm × 1 | |
| Total Piston Area | 30.4 cm² per caliper | |
| Caliper Dimensions | 278 × 202 × 93 mm (L×W×H) | |
| Manufacturing Process | Two-piece forged aluminum body | |
| Net Weight | 4.50 kg per caliper (no 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 iron | Carbon-ceramic composite |
| Axle Position | Rear | Rear |
| Rotor Dimensions | Ø345 / 355 / 380 × 28 mm | Ø380 × 28 mm |
| Construction | Two-piece, internally vented | Two-piece, internally vented |
| Rotor Mounting | Fixed or floating, size/application dependent | Floating |
| Directional Design | Yes — left/right specific | Yes — left/right specific |
| Rotor Face Pattern | Curved slot / Grain slot / Wave slot / Drilled & slotted | Cross-drilled |
| Brake Pad Options | ||
| Pad Option | Iron Rotor Pad | CCB Rotor Pad |
| Compatible Rotor Material | Iron rotors only | Carbon-ceramic rotors only |
| Operating Temperature Range | 0–600 °C | 0–700 °C |
| Average Friction Coefficient | avg μ ≈ 0.38 | avg μ ≈ 0.45 |
| Lines | ||
| Brake Line Construction | Three-layer reinforced | |
| Brake Line Material | PTFE liner / SUS304 braid / PVC outer sheath | |
| Brake Line Fittings | Vehicle-specific fittings | |
| 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 | 97 mm | |
| Recommended Wheel Size | 18 in or larger | |
| EPB Interface | Vehicle-specific; final EPB interface details vary by application | |
| Bedding-In Procedure | Required before aggressive use | |
Iron rotors are paired with a street/track pad rated 0–600 °C with average μ ≈ 0.38. Carbon-ceramic rotors ship with a CCB-specific pad rated 0–700 °C with average μ ≈ 0.45 — strong initial bite with linear modulation deeper into the pedal.
Package List
Calipers ×2
2× EP4S 4-piston rear calipers with integrated EPB actuator.
Brake Pads
Performance brake pads matched to rotor material for both calipers.
Brake Rotors ×2
2× two-piece rotors in your selected size and face pattern.
Caliper Brackets ×2
CNC carbon-steel mounting brackets.
Rotor Hats ×2
CNC aluminum rotor hats.
Brake Hoses ×2
Stainless-steel braided brake lines with vehicle-specific fittings.
Mounting hardware is included.
Will It Fit? Your 3-Step Check
This is a platform-adapted rear big brake kit. Final brackets, brake-line fittings, rotor diameter, and EPB interface details vary by vehicle and must be confirmed before ordering.
1. Wheel Diameter
18-inch wheels or larger are required.
2. Spoke Clearance
Minimum spoke clearance is 97 mm. Verify your wheel offset and internal spoke geometry before purchase.
3. Vehicle Model
Brackets, brake-line fittings, rotor size, and EPB interface are confirmed per application.
Contact us with your year/make/model/trim and wheel spec so we can validate fitment before you order.
Installation & Break-In
- Final brackets, brake-line fittings, rotor diameter, and EPB interface details vary by vehicle and must be confirmed before ordering.
- The EP4S retains the factory electronic parking brake when correctly interfaced with your vehicle.
- A bedding-in procedure is required before aggressive use.
- Follow the supplied procedure to transfer pad material evenly to the rotor and stabilize friction levels.
Frequently Asked Questions
Does the EP4S keep my factory electronic parking brake?
Yes. The caliper includes a dedicated EPB actuator piston (27 mm) in addition to the four hydraulic service pistons, so the OE electronic parking brake function is retained when correctly interfaced with your vehicle.
What rotor sizes are available?
Iron rotors are offered in Ø345, 355, and 380 mm × 28 mm. A carbon-ceramic composite option is available in Ø380 × 28 mm. All are two-piece, internally vented, and directional (left/right specific).
What wheel size do I need?
18 inches or larger, with a minimum 97 mm spoke clearance. Wheel internal geometry varies even within the same diameter — confirm clearance against the caliper envelope (278 × 202 × 93 mm) before ordering.
Will this fit my car directly?
The EP4S is a platform-adapted kit. Brackets, brake-line fittings, rotor size, and EPB interface are confirmed per application. Contact us with your year/make/model/trim and wheel spec so we can validate fitment before you order.
How does the EP4S improve braking performance?
It replaces a smaller OE rear caliper and rotor with a stiffer four-piston forged caliper and a larger two-piece vented rotor. The result is greater thermal capacity, more consistent rear-axle contribution, and more stable pedal feel under repeated heavy stops.
Which pad compound ships with the kit?
Iron rotors ship with a 0–600 °C street/track pad (avg μ ≈ 0.38). Carbon-ceramic rotors ship with a CCB-specific pad rated 0–700 °C (avg μ ≈ 0.45). Both are matched to the rotor material and should never be cross-used.
Ready to spec your EP4S build?
Need fitment confirmation, a custom rotor face pattern, or a matched front big brake kit?
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
4.4 ★★★★★
Based on 22 reviews
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Product Reviews
★★★★★ 5
Safe and Entertaining Chew Toy
Size: Medium
My dog absolutely loves this toy! She gets hours of chewing time out of it, and I feel so much better knowing the keys are made of a material that’s gentle on her teeth. Unlike harder toys that can chip teeth, this one is durable yet safe, and it keeps her happily entertained. Definitely a great choice for any dog that loves to chew.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 20, 2025
★★★★★ 5
Best money spent on a safe puppy chew toy
Size: X-Small, Size: X-Small
One of the best chew toys you can buy for your puppy! This kept him occupied for quite a while and it is one of his favorites.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 24, 2026
★★★★★ 4
Had a 6mo. old teething (English Bulldog) & this has entertained her for 9 mo.!
Size: Medium, Size: Medium
A chew toy lasting over 6 mo. is generally very good, for this breed & this brand! I kept it in her cage at night, so she wouldn't get board & start chewing on her paws. BC I felt it was a safe toy to use in this manner. "It was safe for my teething Bulldog." "Much, much better than other chew toys from this brand!" Others such as the Orange Pretzel they absolutely love! However, they have always splintered into very sharp edges of plastic, which cause the dogs mouth's to bleed (pokes their gums) & then NEED THROWN AWAY! This Key Chain Chew Toy was "really good" compared to other Nylabone brand chew toys, I have purchased! My girls mouth did not bleed from chewing on it:) "So, I am very pleased with this teething ring!" & would buy it again! Notice how the plastic splinters on the ends? Once the toy gets to his point I feel it is definitely time to be replaced! I would recommend this chew toy for a teething med. sized dog! The one I purchased was fairly large. & stayed together safely:) This is the only Nylabone Chew Toy I would ever, leave in a crate at night, thus far! Good Job Nylabone!
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Reviewed in the United States on July 5, 2022
★★★★★ 5
Great teething aid
Size: Small
Puppy loves these. I’ve repurchased a couple of times for my teething pup.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 1, 2026
★★★★★ 5
My dogs love their "keys".
Size: X-Small
My dog loves this. The only negative is that he does chew through it and I have to pick up the pieces or hope that he's not eating it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 29, 2026
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