Do the GiroDisc Rear Rotors for B8 cars also fit the B9 generation?

Yes. GiroDisc lists the GiroDisc Rear Rotors for B8 and B9 Audi models under one part number. Because GiroDisc does not name individual trims on this part, Bulletproof Automotive recommends confirming your rear brake setup before ordering so the right rotor arrives the first time.

Will the rear calipers need to be changed?

No. GiroDisc describes these rotors as a direct replacement for the factory rear disc that bolts on with no modifications. The original calipers are reused, keeping the brake bias and ABS operation exactly as the car left the factory. Nothing else on the rear brake system has to be altered.

Which front rotor matches these on a B9 S4 or S5?

GiroDisc offers the A1-311 front rotor for B9 S4, S5 and SQ5 models, and the A1-130 front rotor for B8 S4 and S5 cars. Either one, paired with these rear rotors, gives the car a full set of GiroDisc two-piece rotors with reusable hats at both ends.

Why does lower unsprung weight at the rear matter?

Unsprung weight is mass the springs and dampers do not support, so reducing it lets the wheel follow the road more closely. GiroDisc notes that the lighter two-piece rotor also cuts rotating mass, which helps acceleration and suspension response on both road and track.

Are replacement rings available for these rear rotors?

Yes. GiroDisc lists part number D2-130, its Audi 330mm rear replacement ring set, under the same number as this rotor. The rings come in pairs with new hardware, the aluminum hats are kept, and only the iron rings change once they reach minimum thickness.

Description

Additional Info

Shipping policy

BP PRICING DIFFERENCE

Reviews

Product Inquiry

Description

GiroDisc Rear Rotors for B8 and B9 Audi S4 and S5

GiroDisc’s Rear Rotors for B8 and B9 Audi S4 and S5 models carry the two-piece floating design to the rear axle, where they bolt on in place of the factory discs and work with the original calipers. Because the caliper stays as Audi specified, the brake balance and ABS work as before. The iron ring is poured in the USA and machined by GiroDisc, and the aluminum hat stays on the car for life, which suits an S4 or S5 owner building a long-term track setup.

Design and Performance

Lighter rotors reduce rotating and unsprung weight, which GiroDisc says brings quicker acceleration and suspension response. Ten cadmium-plated alloy steel drive pins on class 12.9 cap screws let the ring float, anti-noise spring washers keep it quiet when cold, and curved vanes pump air from the hub out through the slotted disc.

Features

Direct replacement for the factory rear disc on B8 and B9 cars
Original rear calipers, bias and ABS retained
Lower rotating and unsprung weight than the stock rotor
Ten drive pins made by GiroDisc and cadmium plated
Class 12.9 cap screws with hardened washers
Slotted face to clear water and debris

What’s Included

Rear rotor assemblies (L/R)

Applications

Audi S4: B8, B9
Audi S5: B8, B9

Notes

GiroDisc lists the Rear Rotors for B8 and B9 Audi models without naming each trim, so confirm your rear brake setup with Bulletproof Automotive before ordering
Replacement rings are the GiroDisc Audi 330mm rear replacement rings, which bolt to these hats
B8 cars pair them with the GiroDisc B8 S4 and S5 front rotors
B9 cars pair them with the GiroDisc B9 S4 and S5 front rotors
Stock photography may not depict the actual product

Frequently Asked Questions

Do the GiroDisc Rear Rotors for B8 cars also fit the B9 generation? Yes. GiroDisc lists the GiroDisc Rear Rotors for B8 and B9 Audi models under one part number. Because GiroDisc does not name individual trims on this part, Bulletproof Automotive recommends confirming your rear brake setup before ordering so the right rotor arrives the first time.
Will the rear calipers need to be changed? No. GiroDisc describes these rotors as a direct replacement for the factory rear disc that bolts on with no modifications. The original calipers are reused, keeping the brake bias and ABS operation exactly as the car left the factory. Nothing else on the rear brake system has to be altered.
Which front rotor matches these on a B9 S4 or S5? GiroDisc offers the A1-311 front rotor for B9 S4, S5 and SQ5 models, and the A1-130 front rotor for B8 S4 and S5 cars. Either one, paired with these rear rotors, gives the car a full set of GiroDisc two-piece rotors with reusable hats at both ends.
Why does lower unsprung weight at the rear matter? Unsprung weight is mass the springs and dampers do not support, so reducing it lets the wheel follow the road more closely. GiroDisc notes that the lighter two-piece rotor also cuts rotating mass, which helps acceleration and suspension response on both road and track.
Are replacement rings available for these rear rotors? Yes. GiroDisc lists part number D2-130, its Audi 330mm rear replacement ring set, under the same number as this rotor. The rings come in pairs with new hardware, the aluminum hats are kept, and only the iron rings change once they reach minimum thickness.

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.

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.

GiroDisc Rear Rotors for B8 and B9 Audi S4 and S5 [A2-130]

Guaranteed Safe Checkout

GiroDisc Rear Rotors for B8 and B9 Audi S4 and S5

Design and Performance

Features

What’s Included

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews