Is the Racing MONO4r Big Brake Kit for RZ34 being replaced?

Endless announced on 30 September 2026 that it is redesigning the Racing MONO4r with its latest analysis methods and larger rotor options, with deliveries expected from around April 2027. The current caliper in this kit is sold until stock runs out, and we will tell you which version your Big Brake Kit for RZ34 order receives.

Why does the Endless USA sheet list the Racing MONO4r kit for the RZ34 Z as Racing Mono4?

Endless USA lists the RZ34 rear kit as Racing Mono4, but the RCP147 pad it specifies belongs to the Racing MONO4r, the rear-only version of the caliper. We use the MONO4r name so the listing matches the caliper Endless actually supplies for the rear axle.

Does the rear kit need a matching front kit?

No part of the installation depends on a front kit. Endless designed the MONO4r to pair with its Racing MONO6 front and sells the two as a set, so most owners buy this kit to complete a car that already has a Racing MONO6 up front.

Does the Racing MONO4r kit for the RZ34 Z keep the parking brake?

The factory parking brake stays. Endless three-piece rear rotors retain it, and this kit runs 355mm x 32mm three-piece rotors at the rear, so the RZ34 Z keeps a working parking brake after the upgrade. Endless two-piece rear rotors are the ones that do not retain it.

What comes in the Endless Racing MONO4r rear kit?

Two Racing MONO4r calipers, an Endless pad set, mounting brackets, two 355mm x 32mm three-piece E-slit rotors and two brake lines. Fluid is not included, and Endless specifies DOT4 or higher. Replace the rotors once the E marks machined into the face have worn away.

Description

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BP PRICING DIFFERENCE

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Description

Endless Racing MONO4r Rear Big Brake Kit for RZ34 Nissan Z

Endless’s Racing MONO4r Rear Big Brake Kit for RZ34 Nissan Z carries the forged monobloc construction of the Racing MONO6 front to the rear axle. Endless builds the MONO4r as a rear-only caliper: EC4606N, 2,260g, two 27mm and two 32mm pistons, and a 15mm RCP147 pad. It runs a 355mm x 32mm three-piece E-slit rotor. Endless lists this caliper as Racing Mono4 on its US price sheet; the RCP147 pad identifies it as the MONO4r. It is the natural rear partner for a Racing MONO6 front, and overkill behind factory front brakes.

Features

EC4606N forged monobloc rear caliper, 2,260g
Four pistons, 27mm and 32mm, two of each
355mm x 32mm three-piece E-slit rotors
15mm RCP147 pad shape
Racing anodise finish, 15 inch minimum wheel
Rear partner to the Racing MONO6 front

Specifications

Caliper: Endless Racing MONO4r, four-piston forged monobloc
Caliper weight: 2,260g
Caliper size: 141mm x 72.5mm x 270mm
Piston sizes: 27mm x 2, 32mm x 2
Finish: Racing anodise
Rotors: 355mm x 32mm, three-piece
Caliper rotor range: 300mm to 355mm diameter
Pad shape: RCP147
Minimum wheel size: 15 inch, per Endless

What’s Included

Endless Racing MONO4r calipers (2)
Endless brake pad set
Caliper mounting brackets (2)
Rotors (2), 355mm x 32mm three-piece
Brake lines (2)

Applications

Nissan Z: RZ34 | 2023-present

Notes

Rear axle only. Endless also sells this Big Brake Kit for RZ34 as a set with the Racing MONO6 front
Endless announced on 2026-09-30 a redesigned Racing MONO4r, with deliveries from around April 2027; current-design stock sells until it runs out
The three-piece rear rotors retain the factory parking brake
Endless USA lists this caliper as Racing Mono4; the RCP147 pad shape is the MONO4r rear caliper
Replace the E-slit rotors when the E marks have worn away, and use DOT4 or higher fluid
Made to order in Japan; lead time is confirmed once ordered

Frequently Asked Questions

Is the Racing MONO4r Big Brake Kit for RZ34 being replaced? Endless announced on 30 September 2026 that it is redesigning the Racing MONO4r with its latest analysis methods and larger rotor options, with deliveries expected from around April 2027. The current caliper in this kit is sold until stock runs out, and we will tell you which version your Big Brake Kit for RZ34 order receives.
Why does the Endless USA sheet list the Racing MONO4r kit for the RZ34 Z as Racing Mono4? Endless USA lists the RZ34 rear kit as Racing Mono4, but the RCP147 pad it specifies belongs to the Racing MONO4r, the rear-only version of the caliper. We use the MONO4r name so the listing matches the caliper Endless actually supplies for the rear axle.
Does the rear kit need a matching front kit? No part of the installation depends on a front kit. Endless designed the MONO4r to pair with its Racing MONO6 front and sells the two as a set, so most owners buy this kit to complete a car that already has a Racing MONO6 up front.
Does the Racing MONO4r kit for the RZ34 Z keep the parking brake? The factory parking brake stays. Endless three-piece rear rotors retain it, and this kit runs 355mm x 32mm three-piece rotors at the rear, so the RZ34 Z keeps a working parking brake after the upgrade. Endless two-piece rear rotors are the ones that do not retain it.
What comes in the Endless Racing MONO4r rear kit? Two Racing MONO4r calipers, an Endless pad set, mounting brackets, two 355mm x 32mm three-piece E-slit rotors and two brake lines. Fluid is not included, and Endless specifies DOT4 or higher. Replace the rotors once the E marks machined into the face have worn away.

About Endless

Endless was founded in 1986, when Isao Hanazato began developing brake pads out of his own racing experience, and the company builds its friction material, rotors, calipers and brake fluid in Saku City, Nagano. It has run its own team since 1991, in the All Japan F3 Championship and the Mirage Cup, and by 2017 had supplied brake fluid to Formula 1 for fifteen consecutive years. The pads supplied in each kit are Endless compounds, so caliper and friction material come from the same company.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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Endless Racing MONO4r Rear Big Brake Kit for RZ34 Nissan Z [1602918]

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Endless Racing MONO4r Rear Big Brake Kit for RZ34 Nissan Z

Features

Specifications

What’s Included

Applications

Notes

Frequently Asked Questions

About Endless

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