Who should buy the Racing MONO6 and MONO4r Big Brake Kit for RZ34?

Owners who run the Z hard on track. Both calipers are forged monoblocs from the Endless Racing MONO family, with a 25mm front pad for long sessions. For mostly road use, the 6POT or Racing 6 versions of the Big Brake Kit for RZ34 cost thousands less and do the job well.

Is the rear caliper being updated?

Endless announced on 30 September 2026 a redesign of the Racing MONO4r, with deliveries expected from around April 2027. Current-design calipers continue to sell until stock runs out, and we will confirm which version your set receives when we place the order.

How do I check rotor wear?

Both axles use Endless E-slit rotors, which carry small E-shaped marks machined into the face alongside the long slits. Endless says to replace the rotor once the E marks have worn away, so wear is visible at a glance with the wheel off.

Will my wheels clear the front calipers on the Racing MONO6 and MONO4r set for the RZ34 Z?

Endless gives 18 inch as the minimum for the Racing MONO6, and the caliper is 177mm deep and 295mm long, so spoke shape matters. Endless notes most factory wheels do not clear its kits, so we will check your wheels against the template.

What comes in the Endless Racing MONO6 and MONO4r set?

Two Racing MONO6 front calipers, two Racing MONO4r rear calipers, pads for both axles, mounting brackets, two 370mm front rotors, two 355mm three-piece rear rotors and four brake lines. Endless specifies DOT4 or higher fluid for the bleed, which is not supplied with the set.

Description

Additional Info

Shipping policy

BP PRICING DIFFERENCE

Reviews

Product Inquiry

Description

Endless Racing MONO6 / Racing MONO4r Front and Rear Big Brake Kit for RZ34 Nissan Z with 370mm Front Rotors

Endless’s Racing MONO6 / Racing MONO4r Front and Rear Big Brake Kit for RZ34 Nissan Z puts forged monobloc calipers at all four corners. The front Racing MONO6 is forged as one piece under several thousand tons of pressure, weighs 2,930g, and holds a 25mm RCP121 pad against a 370mm x 34mm two-piece E-slit rotor. The rear is the MONO4r, the rear-only member of the same family, on 355mm three-piece rotors.

Features

Racing MONO6 forged monobloc front caliper, 2,930g
25mm-thick RCP121 front pad
370mm x 34mm two-piece E-slit front rotors
Racing MONO4r forged monobloc rear caliper, 2,260g
355mm x 32mm three-piece E-slit rear rotors
Racing anodise finish front and rear

Specifications

Front caliper: Endless Racing MONO6, six-piston forged monobloc
Front caliper weight: 2,930g
Front piston sizes: 27mm x 2, 32mm x 2, 38mm x 2
Front rotors: 370mm x 34mm, two-piece
Rear caliper: Endless Racing MONO4r, four-piston forged monobloc
Rear caliper weight: 2,260g
Rear piston sizes: 27mm x 2, 32mm x 2
Rear rotors: 355mm x 32mm, three-piece
Pad shapes: RCP121 front, RCP147 rear
Minimum wheel size: 18 inch front, per Endless

What’s Included

Endless Racing MONO6 front calipers (2)
Endless Racing MONO4r rear calipers (2)
Front and rear Endless brake pad sets
Caliper mounting brackets, front and rear
Front rotors (2), 370mm x 34mm two-piece
Rear rotors (2), 355mm x 32mm three-piece
Brake lines (4)

Applications

Nissan Z: RZ34 | 2023-present

Notes

Covers both axles. This Big Brake Kit for RZ34 is the same set as the listing led by the 355mm rear rotors
Endless announced on 2026-09-30 a redesigned Racing MONO4r, due from around April 2027; current-design rear calipers sell until stock runs out
The Racing MONO6 needs an 18 inch wheel at minimum, per Endless
The three-piece rear rotors retain the factory parking brake
For the standard RZ34 only; replace E-slit rotors when the E marks are worn
Made to order in Japan; bleed with DOT4 or higher fluid

Frequently Asked Questions

Who should buy the Racing MONO6 and MONO4r Big Brake Kit for RZ34? Owners who run the Z hard on track. Both calipers are forged monoblocs from the Endless Racing MONO family, with a 25mm front pad for long sessions. For mostly road use, the 6POT or Racing 6 versions of the Big Brake Kit for RZ34 cost thousands less and do the job well.
Is the rear caliper being updated? Endless announced on 30 September 2026 a redesign of the Racing MONO4r, with deliveries expected from around April 2027. Current-design calipers continue to sell until stock runs out, and we will confirm which version your set receives when we place the order.
How do I check rotor wear? Both axles use Endless E-slit rotors, which carry small E-shaped marks machined into the face alongside the long slits. Endless says to replace the rotor once the E marks have worn away, so wear is visible at a glance with the wheel off.
Will my wheels clear the front calipers on the Racing MONO6 and MONO4r set for the RZ34 Z? Endless gives 18 inch as the minimum for the Racing MONO6, and the caliper is 177mm deep and 295mm long, so spoke shape matters. Endless notes most factory wheels do not clear its kits, so we will check your wheels against the template.
What comes in the Endless Racing MONO6 and MONO4r set? Two Racing MONO6 front calipers, two Racing MONO4r rear calipers, pads for both axles, mounting brackets, two 370mm front rotors, two 355mm three-piece rear rotors and four brake lines. Endless specifies DOT4 or higher fluid for the bleed, which is not supplied with the set.

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.

Reviews

There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

Product Inquiry

First Name (*required)

Last Name (*required)

Your E-Mail (*required)

Telephone Number (*required)

Country (*required)

Vehicle Year / Make / Model (*required)

Please Explain What do you want to do with your vehicle

Additional Information (optional)

I agree to the terms & conditions and privacy policy and to have Bulletproof Automotive LLC contact me for promotion, marketing and other purposes via email, phone or SMS message.

Endless Racing MONO6 / Racing MONO4r Front and Rear Big Brake Kit for RZ34 Nissan Z with 370mm Front Rotors [1602923-370]

Guaranteed Safe Checkout

Endless Racing MONO6 / Racing MONO4r Front and Rear Big Brake Kit for RZ34 Nissan Z with 370mm Front Rotors

Features

Specifications

What’s Included

Applications

Notes

Frequently Asked Questions

About Endless

Reviews