Description
Discs
The 1-piece discs used in our (Stage-1) X-Line 4×4 big brake kits are cast from a proprietary high-carbon cast iron alloy that provides excellent durability and stability under the high thermal loads experienced under fast-street or off-road driving. The discs feature curved, directional cooling vanes. The design significantly increases cooling vane surface area and air-flow when compared to factory / OEM disc designs, resulting in vastly improved cooling.
The slot pattern chosen for our X-Line 4×4 discs is our well-proven “AT” slot pattern that provides a good balance between functional aspects such as efficient removal of sand, mud and water (when driving in the rain or after river crossings) and practical aspects such as low levels of noise, vibration and harshness (NVH) under braking. The slot pattern also provides good bite and release characteristics.
Every single Powerbrake disc is measured for run-out and disc thickness variation (DTV) using Swiss measuring equipment. When it comes to QC, there is no batch or statistical quality checking of Powerbrake discs. Every single disc is measured. Our machining tolerances are up to three times tighter than the industry norm.
Disc Surface Coating
All our X-Line 4×4 disc rings are coated with a proprietary black surface coating. The discs are chemically de-greased before the application of this coating to ensure that no machining fluids or other contaminants that can be absorbed the brake pads and negatively affect brake performance are present on our discs at all. The coating is able to withstand extremely high temperatures and is flexible enough to expand and contract without flaking or peeling off of the disc surface during the constant thermal expansion and contraction cycles experienced by the brake disc.
Our X-Line 4×4 Ford Bronco big brake discs require no cleaning or preparation using solvents at all. Simply ensure that the car’s hub is clean and fit the discs as they come out of the box. The black coating will be removed by the brake pads in the pad track areas within the first 4-5 brake applications. The un-swept areas of the disc will remain coated. While our disc coating was primarily designed to ensure that there was zero presence of oils and contaminants on our disc surfaces at the time of fitting (and was not in fact designed to provide corrosion protection), practical experience has shown that the non-swept areas of our coated X-Line 4×4 discs will in fact resist the common formation of unsightly surface rust on the non-swept areas of the discs quite well (depending on environmental conditions in your area). This results in a far more visually appealing assembly visible through the car’s wheels.
Disc Maximum Temperature Recording (MTR) System
Unique to Powerbrake, all X-Line 4×4 big brake discs feature our MTR system that provide a permanent record of the peak operating temperature reached by the discs. This information is extremely valuable when selecting correct pad compounds for your application. The thermal-paint tabs are applied to the outside diameter of all X-Line 4×4 discs (on both the inboard and outboard disc plates).
Each single-change paint color (4-levels: Blue, Green, Orange and Pink) changes to white when a specific temperature is reached, hereby providing a record of the peak operating temperature of the disc. We also add a multi-change paint that can be used with a provided color gradient chart to further refine the results to a more specific temperature. The simple information required to interpret the results recorded by the MTR system on our X-Line 4×4 discs is provided in the instruction manual that accompanies every X-Line 4×4 big brake kit.
See the below list of vehicle applications, and please reach out to us if you are unsure about what to order.
These are sold in pairs, including 1 left and right side
Vehicle Application List:
| Part Number | Description | Fitment |
| AT480-PAIR | 48 Vein Stage-1 Brake Rotor Set 350x34mm (13.8″) – includes left & right rotor | Fits 17″ Wheels: Ford Ranger & Bronco |
| AT481-PAIR | 48 Vein Stage-1 Brake Rotor Set 350x34mm (13.8″) – includes left & right rotor | Fits 17″ Wheels: JEEP Gladiator & Wrangler |
| AT482-PAIR | 48 Vein Stage-1 Brake Rotor Set 350x34mm (13.8″) – includes left & right rotor | Fits 17″ Wheels: Tacoma 2nd & 3rd Gen, FJ Cruiser, 4th & 5th Gen 4Runner, Hilux, 1st Gen Tundra and Sequoia, Prado 150, Lexus GX470, GX460 |
| AT483-PAIR | 48 Vein Stage-1 Brake Rotor Set 350x34mm (13.8″) – includes left & right rotor | Fits 17″ Wheels: Landcruiser 100 Series |
| AT500-PAIR | 56 Vein Stage-1 Brake Rotor Set 370x34mm (14.5″) – includes left & right rotor | Fits 18″ Wheels: Land Cruiser 200, 2nd Gen Tundra / Sequoia |
| AT501-PAIR | 56 Vein Stage-1 Brake Rotor Set 370x34mm (14.5″) – includes left & right rotor | Fits 18″ Wheels: Land Cruiser 300, 3rd Gen Tundra & 3rd Gen Sequoia, Land Cruiser 250, 4Runner 6th Gen, Tacoma 4th Gen, GX550 |
Check out all of the brake options from Powerbrake by following here
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