Stoptech
Stoptech Anti Knock-Back Spring for 26-36mm Pistons (Sold Individually) - 4lbs of Force
sto42.200.1007
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StopTech 12 Audi A6 Quattro/11-12 A7 Quattro/13 Q5/7-11/13 S4/12 S5 Front Left Drilled Rotor
StopTech Drilled Sport Rotors are 1-piece direct replacement brake discs for factory brake systems and stock calipers that look great behind your wheels – and offer significantly improved braking performance. The unique cross-drilling aids with heat and brake dust dispersal; prevents glazing of the pads; adds bite and improves wet and dry braking performance. Built to last; the black e-coating provides protection from corrosion and the high carbon metallurgy (in most applications) offers quieter operation; better crack resistance and increased performance.
Premium rotor with advanced metallurgy that greatly reduces pad squeal. Especially effective with higher friction; European style brake pad compounds. Slotted for increased bite; improved looks and better performance
2016 - 2017 Audi A5, 2014 - 2019 Audi A6, 2012 - 2019 Audi A6 Quattro, 2018 - 2018 Audi A7, 2011 - 2018 Audi A7 Quattro, 2013 - 2017 Audi Q5, 2012 - 2016 Audi S4, 2012 - 2017 Audi S5, 2015 - 2020 Porsche Macan
For drivers who need something even tougher than a standard StopTech Sport rotor, but are not ready for a big brake kit, StopTech offers cryogenically treated Cryo rotors.
Cryogenic treatment is a one-time stress relief process that involves both cold and heat cycling of the brake rotor. Using a proprietary computer-controlled process over a 24-hour period, the cryo machine gradually cools the rotors down to -300 º F, then gradually brings them up to over +300º F, and finally back to room temperature. This conditioning of the rotor improves its service life, especially in fleet and emergency vehicle applications.
Any new StopTech or Centric Premium 1-piece replacement rotor can by cryogenically treated prior to shipment. Cryo treatment typically adds 5-7 business days for processing.
| Additional Application Notes | |
|---|---|
| • Drilled | |
| • Position: Front Left Drilled | |
| • Position: Front Left | |
| • Position: Front Left; 330mm Rear Disc Drilled 345mm Front Disc | |
| • TRW Calipers Position: Front Left; 330mm Rear Disc 345mm Front Disc 330mm Rear Disc | |
| • Drilled 345mm Front Disc | |
| • TRW Calipers 345mm Front Disc 330mm Rear Disc | |
| • Position: Front Left; 345mm Front Disc | |
| • Position: Front Left; Iron Discs Position: Front Left; 345mm Front Disc Iron Discs Drilled | |
| • Position: Front Left; Iron Discs Position: Front Left; 345mm Front Disc Iron Discs | |
| • Drilled 345mm Front Disc 330mm Rear Disc~345mm Front Disc 330mm Rear Disc | |
| • Position: Front Left; 345mm Front Disc Drilled 345mm Front Disc | |
| • 345mm Front Disc 330mm Rear Disc | |
| • TRW Calipers Position: Front Left; 345mm Front Disc 345mm Front Disc 330mm Rear Disc | |
| • Position: Front Left; Iron Discs Position: Front Left; 345mm Front Disc | |
| • Position: Front Left; 330mm Rear Disc Drilled 345mm Front Disc 330mm Rear Disc~345mm Front Disc 330mm Rear Disc | |
| • Drilled 345mm Front Disc 300 mm Rear Disc~345mm Front Disc 300 mm Rear Disc | |
| • 345mm Front Disc 300 mm Rear Disc | |
| • TRW/Girling Brakes~TRW/Girling Front Caliper Position: Front Left; TRW / Girling Front Caliper Drilled Left | |
| • TRW / Girling Front Caliper Position: Front Left; TRW / Girling Front Caliper | |
| • TRW/Girling Brakes Position: Front Left; TRW / Girling Front Caliper Drilled Left | |
| • Position: Front Left; Brembo Brakes Drilled Brembo Brakes | |
| • Position: Front Left; Brembo Brakes Drilled | |
| • Iron Disc 350mm Front 330mm Rear | |
| • Position: Front Left; Fr 6/20/11 Fr 6/20/11 Drilled | |
| • Iron Disc Drilled Black Calipers 345mm Front Disc~Black Calipers~Iron Disc 345mm Front Disc | |
| • Iron Disc 345mm Front Disc | |
| • Iron Disc Black Calipers 345mm Front Disc | |
These additional application notes are supplied by the manufacturer and collated from multiple year ranges. Not all of these notes may apply to every year or every variant. Please contact a StreetFX agent for clarification if required.
This item is available as a full kit.
Select a kit option in the following table if you are looking for this item in a bundle form with all associated components.
| Thumb | SKU | Kit Title |
|---|---|---|
| sto939.33088 | Street Axle Pack Drilled, Front (1x sto308.16630, 1x sto128.33138R, 1x sto128.33138L) | |
| sto979.33080 | Sport Axle Pack Drilled Rotor, 4 Wheel (1x sto309.13861, 1x sto309.13220, 1x sto950.33016, 1x sto950.33516, 1x sto128.33137L, 1x sto128.33137R, 1x sto128.33138R, 1x sto128.33138L) | |
| sto979.33080F | Sport Axle Pack Drilled Rotor, Front (1x sto309.13220, 1x sto950.33016, 1x sto128.33138R, 1x sto128.33138L) | |
| sto936.33148 | Street Axle Pack, Drilled, 4 Wheel (1x sto308.16630, 1x sto308.15470, 1x sto128.33137L, 1x sto128.33137R, 1x sto128.33138R, 1x sto128.33138L) |
Unless otherwise specified, some brands supply brake rotors, pistons, strut mounts, rods and rings separately. In some cases, titles may indicate plural, or 'set' - eg the term “ring set” often refers to the rings for a single piston only. If you’re unsure about what’s included with this product, please contact our team for clarification.
(keyword: rotor)Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.
| ABS Tone Ring Included: | No |
| Bearings Included: | No |
| Center Hole Diameter: | 68.000 |
| Description: | StopTech Sport Cross Drilled Brake Rotor; Front Left |
| Disc Mounting (cntrc): | Floating |
| Disc Mounting [cntrc]: | Floating |
| Discard Thickness: | 28.000 |
| Hat Finish: | Coated |
| Hat ID (cntrc) in: | 5.941 |
| Hat ID (cntrc) mm: | 150.900 |
| Hat ID [cntrc] in: | 5.941 |
| Hat ID [cntrc] mm: | 150.900 |
| Misc Holes (cntrc): | 1 |
| Misc Holes [cntrc]: | 1 |
| Mounting Bolt Hole Circle Diameter: | 4.409 |
| Nominal Thickness: | 30.000 |
| Outside Diameter: | 13.583 |
| Overall Height: | 2.051 |
| Part Number: | sto128.33138L |
| Position: | Front Left |
| Rotor Type: | Drilled |
| Solid Or Vented Type Rotor: | Vented |
| Stud/Lug Hole Diameter: | 0.602 |
| Stud/Lug Hole Quantity: | 5 |
| Surface Type: | X Drilled |
| Title: | StopTech Sport Cross Drilled Brake Rotor; Front Left |
| Vane Style (cntrc): | Pillar |
| Vane Style [cntrc]: | Pillar |
| Weight (cntrc) kgs: | 11.560 |
| Weight (cntrc) lbs: | 25.500 |
| Weight [cntrc] kgs: | 11.560 |
| Weight [cntrc] lbs: | 25.500 |
Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.
| Reference Data (Provide these details to our support team) | |
|---|---|
| Brand Name/s | Stoptech, CENTRIC BRAKE PARTS, Centric Parts |
| StreetFX SKU | sto128.33138L |
| SFX Item ID | 4453821 |
| Accounting SKU | sto-128.33138L |
| Manufacturer SKU | 128.33138L |
| Manufacturer UPC | 805890844556 |
| Alternative References | SPH-128-33138L |
Brake Rotor, Cross Drilled, Cast Iron, Black E-Coat, Driver Side Front, Audi, Porsche, Each
StopTech drilled rotors offer awesome control, responsive pedal feel, and supreme durability, plus a great look behind your open wheels! These quality replacements fit like your stock rotors, but they're cast from a unique power alloy—chromium and iron—and are mill-balanced to resist thermal stress and vibration noise. Then, they're CNC-machined and drilled to improve heat and gas dissipation and maximize your stopping power. Most have a durable black E-coating applied to the non-friction areas of the rotors to prevent unsightly corrosion for a lasting, sporty appeal. Don't put up with poor factory rotors; you'll run cooler with improved braking performance and an enhanced appearance with StopTech drilled brake rotors.
| Product Attributes | |
|---|---|
| UPC | 805890844556 |
| Brand | StopTech |
| Quantity | Sold individually. |
| Part Type | Brake Rotors |
| Rotor Style | Cross-drilled surface |
| Product Line | StopTech Drilled Brake Rotors |
| Rotor Finish | Black E-Coat |
| Rotor Material | Iron |
| Rotor Construction | Vented |
| Intended for Street Use | Yes |
| Nominal Thickness (in.) | 1.180 in. |
| Manufacturer's Part Number | 128.33138L |
| For Use with Stock Calipers | Yes |
| Rotor Outside Diameter (in.) | 13.58 in. |
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