Should I choose the 324mm or 332mm Racing MONO4r Big Brake Kit for AP1?

Match it to the front. The 324mm rear suits an S2000 on a 324mm or 332mm front kit, while the 332mm rear belongs behind the larger fronts Endless lists for the car, on 345mm to 370mm rotors. Both use the same MONO4r caliper and RCP147 pad.

Why does the Endless USA sheet list the Racing MONO4r kit for the AP1 S2000 as Racing Mono4?

Endless USA lists this 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 title matches the caliper supplied for the rear axle.

Is the Racing MONO4r in the Racing MONO4r kit for the AP1 S2000 being redesigned?

Endless announced on 30 September 2026 that it is redesigning the Racing MONO4 and MONO4r, with deliveries expected from around April 2027. The current caliper is sold until stock runs out, and we will confirm which version your order receives.

Does the parking brake still work on the Racing MONO4r kit for the AP1 S2000?

No. Endless two-piece rear rotors do not retain the factory parking brake, and this kit runs 332mm x 30mm two-piece rotors at the rear, so the AP1 S2000 loses its factory parking brake with this upgrade. Plan for that before ordering, and ask us if you want to talk it through.

What is included in the Racing MONO4r kit for the AP1 S2000?

Two Racing MONO4r calipers, RCP147 Endless pads, mounting brackets, two 332mm x 30mm two-piece E-slit rotors and two brake lines. DOT4 or higher fluid is needed for the bleed of this Big Brake Kit for AP1 and is not supplied.

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Description

Endless Racing MONO4r Rear Big Brake Kit for AP1 Honda S2000 with 332mm Rotors

Endless’s Racing MONO4r Rear Big Brake Kit for AP1 Honda S2000 with 332mm rotors is the larger of the two Racing MONO4r rear kits Endless USA lists for the early S2000, moving up from 324mm to 332mm x 30mm two-piece E-slit rotors. The rear-only EC4606N is a forged monobloc weighing 2,260g, with two 27mm and two 32mm pistons and a 15mm RCP147 pad, finished in racing anodise. Endless lists it as Racing Mono4 on its US sheet; the RCP147 pad identifies the rear MONO4r. It suits an AP1 running one of the larger Endless front kits on 345mm to 370mm rotors.

Features

EC4606N Racing MONO4r forged monobloc rear caliper, 2,260g
332mm x 30mm two-piece E-slit rotors
Two 27mm and two 32mm pistons
15mm RCP147 pad shape
Racing anodise finish
One step up in rotor size from the 324mm AP1 rear kit

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: 332mm x 30mm, two-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), 332mm x 30mm two-piece
Brake lines (2)

Applications

Honda S2000: AP1 | 2000-2005

Notes

Rear axle only. This Big Brake Kit for AP1 does not include front brakes
Endless USA lists this caliper as Racing Mono4; the RCP147 pad shape is the rear-only MONO4r
Endless announced on 2026-09-30 a redesigned Racing MONO4 and MONO4r, with deliveries from around April 2027; current-design stock sells until it runs out
The factory parking brake is not retained. Endless two-piece rear rotors do not carry it
Endless USA also lists this caliper on 324mm rear rotors for the AP1
Made to order in Japan; use DOT4 or higher fluid

Frequently Asked Questions

Should I choose the 324mm or 332mm Racing MONO4r Big Brake Kit for AP1? Match it to the front. The 324mm rear suits an S2000 on a 324mm or 332mm front kit, while the 332mm rear belongs behind the larger fronts Endless lists for the car, on 345mm to 370mm rotors. Both use the same MONO4r caliper and RCP147 pad.
Why does the Endless USA sheet list the Racing MONO4r kit for the AP1 S2000 as Racing Mono4? Endless USA lists this 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 title matches the caliper supplied for the rear axle.
Is the Racing MONO4r in the Racing MONO4r kit for the AP1 S2000 being redesigned? Endless announced on 30 September 2026 that it is redesigning the Racing MONO4 and MONO4r, with deliveries expected from around April 2027. The current caliper is sold until stock runs out, and we will confirm which version your order receives.
Does the parking brake still work on the Racing MONO4r kit for the AP1 S2000? No. Endless two-piece rear rotors do not retain the factory parking brake, and this kit runs 332mm x 30mm two-piece rotors at the rear, so the AP1 S2000 loses its factory parking brake with this upgrade. Plan for that before ordering, and ask us if you want to talk it through.
What is included in the Racing MONO4r kit for the AP1 S2000? Two Racing MONO4r calipers, RCP147 Endless pads, mounting brackets, two 332mm x 30mm two-piece E-slit rotors and two brake lines. DOT4 or higher fluid is needed for the bleed of this Big Brake Kit for AP1 and is not supplied.

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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