Will this GRX121 big brake kit clear my wheels?

Clearance depends on wheel design, not just diameter. This kit runs 345mm x 32mm rotors. Endless publishes wheel clearance data for its kits; contact Bulletproof Automotive with your wheel specs before ordering and we will confirm fitment.

What is included in the Endless 1933321-345 kit?

The kit includes Endless MONO6 Sports front calipers, R4 SET rear calipers, brake pad sets, mounting brackets, rotors for both axles, and brake lines. It is a complete front and rear system for the GRX121 Toyota Mark X under one part number.

Why choose a front and rear kit over a front-only upgrade?

A matched front and rear system like this Endless MONO6 Sports / R4 SET kit keeps brake bias close to the engineered balance as outright grip rises. Front-only upgrades work well for street use, but dual-axle kits keep the car neutral under hard, repeated braking on circuit.

What pad compounds work with the Endless MONO6 Sports / R4 SET calipers?

Endless supports its street-through-track pad compound range, including MX72 and MX72 Plus, across these calipers, so the same grx121 big brake kit covers daily driving and circuit days on a pad change. Contact Bulletproof Automotive for the current compound lineup.

Is this kit a direct bolt-on?

Yes. Part number 1933321-345 ships with mounting brackets and brake lines for the 2004-2009 Toyota Mark X, so the kit bolts on without fabrication. Bed the pads in dry conditions after installation to reach full performance.

Part number 1933321-345 is sold as one complete front and rear brake system covering all four corners: calipers, rotors, pads, brackets, and lines, priced and shipped as a single system.

Description

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Description

Endless MONO6 Sports / R4 SET Front & Rear Big Brake Kit with 345mm 2-Piece Rotors for GRX121 Toyota Mark X [1933321-345]

The Endless MONO6 Sports / R4 SET is a complete GRX121 big brake kit for the 2004-2009 Toyota Mark X, pairing six-piston MONO6 Sports front calipers and four-piston R4 SET rear calipers with 345mm x 32mm two-piece slit rotors up front and 330mm rotors at the rear, performance pads, caliper mounting brackets, and brake lines for the front and rear axles. Both axles get matched Endless calipers so bias, pedal feel, and pad character stay consistent front to rear. The rotors carry the Endless slit face that keeps the pad surface clean and friction stable as heat builds. Every component is designed and manufactured in Japan by Endless. Supplied as a complete front and rear kit in the Endless racing anodize caliper finish.

Features

Matched Endless MONO6 Sports front and R4 SET rear calipers keep brake bias and pedal feel consistent across both axles
Full-car brake solution in one part number, engineered together rather than pieced from separate kits
Slit rotor face continuously refreshes the pad surface and vents gas without the cracking risk of cross-drilled discs
Two-piece rotor construction reduces unsprung weight and manages heat across repeated hard stops
Complete dual-axle system: calipers, pads, brackets, rotors, and lines under one part number
Direct bolt-on installation on the GRX121 with the included mounting brackets
Machined to Endless production standards with surface accuracy held to 1/1000mm
A GRX121 big brake kit that moves between street and circuit duty on a pad change

Specifications

Front Caliper: Endless MONO6 Sports, six pistons
Rear Caliper: Endless R4 SET, four pistons
Caliper Finish: Endless racing anodize
Rotor Size (Front): 345mm x 32mm
Rotor Size (Rear): 330mm x 28mm
Rotor Construction: Two-piece, slit face
Kit Contents: Endless Racing Calipers (4); Brake Pad Set – Front; Brake Pad Set – Rear; Caliper Mounting Brackets (4); Large Diameter Brake Rotors (4) – 345mm x 32mm; Stainless Brake Lines (4)
Part Number: 1933321-345 (Endless Japan reference EFAXGRX121)
Position: Front & Rear

Applications

Toyota Mark X: GRX121 | 2004-2009

Notes

Verify wheel clearance before ordering; Endless publishes wheel clearance diagrams and Bulletproof Automotive will confirm fitment against your wheel specs.
Bed the pads in dry conditions; bedding in rain prevents the pads from reaching full performance.
This kit services both axles as a matched system.
Sold as a complete front and rear brake system (all four corners).

Frequently Asked Questions

Will this GRX121 big brake kit clear my wheels? Clearance depends on wheel design, not just diameter. This kit runs 345mm x 32mm rotors. Endless publishes wheel clearance data for its kits; contact Bulletproof Automotive with your wheel specs before ordering and we will confirm fitment.
What is included in the Endless 1933321-345 kit? The kit includes Endless MONO6 Sports front calipers, R4 SET rear calipers, brake pad sets, mounting brackets, rotors for both axles, and brake lines. It is a complete front and rear system for the GRX121 Toyota Mark X under one part number.
Why choose a front and rear kit over a front-only upgrade? A matched front and rear system like this Endless MONO6 Sports / R4 SET kit keeps brake bias close to the engineered balance as outright grip rises. Front-only upgrades work well for street use, but dual-axle kits keep the car neutral under hard, repeated braking on circuit.
What pad compounds work with the Endless MONO6 Sports / R4 SET calipers? Endless supports its street-through-track pad compound range, including MX72 and MX72 Plus, across these calipers, so the same grx121 big brake kit covers daily driving and circuit days on a pad change. Contact Bulletproof Automotive for the current compound lineup.
Is this kit a direct bolt-on? Yes. Part number 1933321-345 ships with mounting brackets and brake lines for the 2004-2009 Toyota Mark X, so the kit bolts on without fabrication. Bed the pads in dry conditions after installation to reach full performance.
How is the kit sold? Part number 1933321-345 is sold as one complete front and rear brake system covering all four corners: calipers, rotors, pads, brackets, and lines, priced and shipped as a single system.

About Endless

Endless is a Japanese brake manufacturer that designs everything in-house and manufactures domestically in Japan, holding surface accuracy to 1/1000mm under strict quality control. The company developed its own laminated sintered wire-mesh backing plate and ceramic carbon rotors, and it proves its parts in competition, running its own factory motorsport program and supplying winning teams across Japanese and European racing. From pads and slit rotors to forged and monobloc calipers, brake fluid, and lines, Endless builds braking systems trusted on both street and circuit.

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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