Does the GiroDisc ACR Rear Iron Rotor Conversion keep the parking brake?

Yes. GiroDisc states the ACR Rear Iron Rotor Conversion bolts directly to the Viper and works with the original calipers and parking brake without issue. Nothing has to be modified, so the rear brake hardware of the ACR stays as Dodge supplied it.

Should the front and rear Viper ACR conversions be fitted together?

GiroDisc offers matching front and rear conversions for the ACR, and fitting both gives the car iron rotors at all four corners. Running iron at one end and ceramic at the other is a choice best discussed with us before ordering, so the brake balance suits how the car is used.

How many drive pins are used on the ACR rear rotors?

Ten. Each high-strength alloy steel pin is made by GiroDisc to its own specification and cadmium plated against corrosion. The pins carry the braking load between ring and hat while letting the ring float, and spring washers stop them rattling when the rotors are cold.

Are the Viper ACR rear rotors directional?

Yes. The curved vanes pump air from the hub outward only when the rotor turns in the correct direction. GiroDisc makes left and right handed rotors and labels each one for its position, so fitting them to the marked side keeps the cooling working as designed.

What happens to the factory ceramic discs after the swap?

They come off intact, because the GiroDisc conversion needs no modification to the car. The original ceramic discs can be stored so the ACR can be returned to its factory brakes later, while the GiroDisc aluminum hats stay in service and only need new rings as they wear.

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Description

GiroDisc ACR Rear Iron Rotor Conversion for Dodge Viper

GiroDisc’s ACR Rear Iron Rotor Conversion for the Dodge Viper swaps the factory carbon-ceramic rear discs for two-piece iron rotors with no modifications at all, keeping the original calipers and the parking brake. With the matching front conversion it gives a track-driven ACR iron brakes all round, where wear means a new pair of rings instead of a new set of ceramic discs. Ten drive pins float each ring on its aluminum hat.

Bolt-On and Go

The ACR Rear Iron Rotor Conversion bolts directly to the car, and both the rear calipers and the parking brake work without issue, as GiroDisc states. Cadmium-plated alloy steel drive pins and class 12.9 cap screws with hardened washers join ring and hat, and spring washers let the ring grow with heat while keeping it quiet.

Features

Two-piece iron rotor in place of the factory ceramic rear disc
Works with the original rear calipers and parking brake
10 high-strength alloy steel drive pins
6061-T6 aircraft-specification aluminum hat
Curved vanes that pump air out through the disc
Rotors labeled for left and right

What’s Included

Rear rotor assemblies (L/R)

Applications

Dodge Viper ACR: 8.4L V10

Notes

This conversion replaces factory carbon-ceramic rear discs on the Viper ACR
The GiroDisc ACR front iron conversion completes the swap at the front axle
The cap screws can look loose by design and are never tightened beyond 60 in-lb (7 Nm)
Stock photography may not depict the actual product

Frequently Asked Questions

Does the GiroDisc ACR Rear Iron Rotor Conversion keep the parking brake? Yes. GiroDisc states the ACR Rear Iron Rotor Conversion bolts directly to the Viper and works with the original calipers and parking brake without issue. Nothing has to be modified, so the rear brake hardware of the ACR stays as Dodge supplied it.
Should the front and rear Viper ACR conversions be fitted together? GiroDisc offers matching front and rear conversions for the ACR, and fitting both gives the car iron rotors at all four corners. Running iron at one end and ceramic at the other is a choice best discussed with us before ordering, so the brake balance suits how the car is used.
How many drive pins are used on the ACR rear rotors? Ten. Each high-strength alloy steel pin is made by GiroDisc to its own specification and cadmium plated against corrosion. The pins carry the braking load between ring and hat while letting the ring float, and spring washers stop them rattling when the rotors are cold.
Are the Viper ACR rear rotors directional? Yes. The curved vanes pump air from the hub outward only when the rotor turns in the correct direction. GiroDisc makes left and right handed rotors and labels each one for its position, so fitting them to the marked side keeps the cooling working as designed.
What happens to the factory ceramic discs after the swap? They come off intact, because the GiroDisc conversion needs no modification to the car. The original ceramic discs can be stored so the ACR can be returned to its factory brakes later, while the GiroDisc aluminum hats stay in service and only need new rings as they wear.

About GiroDisc

GiroDisc designs, manufactures, and sells 2-piece, fully floating brake rotors for a wide range of performance vehicles. Every major component, including the hats, rotor rings, and drive pins, is manufactured in-house at their facility in Bellingham, Washington, from domestically sourced materials. GiroDisc rotors use a proprietary high-carbon iron ring formulated for superior metallurgy and thermal performance, paired with reusable machined-aluminum hats that reduce the long-term cost of maintaining a high-performance brake system. The 2-piece floating design sheds unsprung and rotating mass while remaining street-friendly, delivering race-proven braking for track and street use alike.

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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GiroDisc ACR Rear Iron Rotor Conversion for Dodge Viper [A2-165]

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GiroDisc ACR Rear Iron Rotor Conversion for Dodge Viper

Bolt-On and Go

Features

What’s Included

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews