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  Home > Brake Systems > Front Rotors, Pads & Sensors > Gen 2 MINI >

DBA 4000 XS Sport | Slotted & Drilled Front Rotors for the MINI Cooper | (1 Pair)

DBA 4000XS - Front Rotors


 
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List Price $426.95
Our Price $384.26
You Save: $42.69


Shipping Status: IN STOCK!
Product Code: MINI-DBA42524XS

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Description Addt'l Product Info
 

DBA 4000 XS Sport | MINI Cooper S | MINI JCW | 294mm Front Rotors | 1 Pair

These discs utilize High Carbon Alloyed Iron (XG-150) and Thermal Stability Profiling (TSP) allowing constant extreme heat cycles designed for those “late braking scenarios”. 4000 XS and 5000 XS provides improved braking performance, better brake pedal feel and with the benefit of looking the part as well.


Thermal Stability Profiling

TSP is a propriety process specifically developed by DBA for improving the performance of disc brake rotors. Benefits of TSP include:

  • Improved fatigue resistance to minimize surface cracking
  • Reduced rotor fatigue during prolonged heavy braking
  • Quick replacement, minimal ''bedding-in'' of rotors



Thermo-Graphic Temperature Monitoring

Thermo-Graphic markings are placed on the outer edge of each DBA 4000 series disc rotors and are used to monitor the core temperatures achieved during braking application. The markings change color as the rotor heats up to alert the driver to rotor temperatures that exceed optimum levels.

Initial
Color
When rotor
exceeds this
temperature...
The color will change to...
458°C
550°C
630°C



Kangaroo Paw

''Kangaroo Paw'' is a patented, high-tech disc rotor ventilation system designed and manufactured in Australia by Disc Brakes Australia and available on rotors for select applications. "Kangaroo Paw" technology delivers significantly improved braking performance. Even under extreme braking conditions. Kangaroo Paw rotor designs run cooler, are stronger, and outperform traditional straight-vane disc rotors.

Kangaroo Paw Rotor

'The ''Kangaroo Paw'' design features a series of 144 diamond- and tear drop-shaped pillars and columns individually spaced between the rotor faces.




This system provides two key advantages.

  • First, is the ability to cool the rotor faster than ever before. As the disc rotor rotates, aerodynamic turbulence around the individual pillars and columns is generated, increasing the force of hot air out from within the internal areas of the rotor.
  • Second is increased dimensional stability across the disc rotor directly achieved by the individually spaced pillars and columns.

These advantages increase the disc rotor''s efficiency by as much as 20% when compared to conventional rotor designs. A 20% increase in disc rotor efficiency directly translates to reduced brake operating temperatures, brake fade, disc rotor stresses, disc thickness variation, run-out and shudder.

The 4000 Series XS Rotor’s Tri-Symmetrical design dampens the vibration noise while providing a quieter, more responsive and smoother brake pedal feel. Along with an increased number of out-gassing exit points for brake pad friction gases to escape, XS Rotors offer enhanced consistency and effectiveness with every stop. Manufactured to QS-9000 quality standards using premium grade materials with XG-150 high carbon alloyed iron and dense metal matrix, the rotors are designed to provide long wear and safe, consistent stopping power by responding to the TSP process that stabilizes the micro-structure of the rotor.

  • Tri-Symmetrical slot design results in a quieter, more responsive and smoother pedal feel.
  • Slots continually de-glaze the brake pads improving efficiency and reducing rotor scoring.
  • Slots even out wear across the brake pad faces, increasing the effective contact area and extending rotor life.
  • Slots help dissipate water when driving in poor weather, as well as pump away dust and dirt.
  • Slotting also combats "out-gassing," where gas (from the pad bonding agents) can form a cushion between pad and rotor, greatly reducing braking power.
DBA rotors are chosen as Original Equipment on many vehicles.

Features

Rotor Tech

DBA 4000XS Series Rotors | MINI Dynamics

Residual stress is a common structural weakness that occurs during the casting process of iron, the most prevalent material in brake rotors. This same weakness is inherent in all casted iron, but makes a more dramatic impact in applications where the iron is heated and cooled repeatedly such as automotive braking systems causing expansion and contraction of the material. DBA 4000XS Series Rotors | MINI Dynamics

During typical driving, residual stress is unlikely to cause any problems at all. However in racing or aggressive driving situations where the brakes are at high temperature for a extended periods of time, these residual stresses can lead to thermal cracking and deformation of the rotor which can lead to vibrations or brake ‘judder.’ In a an effort to work around this inherent issue with casted iron, often times heat treating is employed to add additional protection from heat related issues.

DBA 4000XS Series Rotors | MINI Dynamics

Each application, product and manufacturer has their own specific steps for heat treating, but we’ll discuss the process in general for explanation purposes. Typically the product (in this case brake rotors) are heated in a strictly controlled environment, increasing the temperature very slowly, and at predetermined intervals until they are at the maximum defined temperature. At that point the rotors will remain heated at the precise maximum temperature for a period of around 8 hours. When that heating interval ends, the rotors are very slowly cooled again using strict controls gradually reducing their temperature until they reach ambient temperature. Often times, this process can take over 24 hours. By strictly controlling the temperature and humidity, this process helps strengthen the bonds between molecules within the rotor.

Commonly known as “profiling,” DBA uses our own variation of the process that we refer to as Thermal Stability Profiling, or TSP. This TSP treatment re-aligns the microstructure of the iron resulting in added resistance to deformation, and increased heat resistance.

DBA 4000XS Series Rotors | MINI Dynamics
DBA 4000XS Series Rotors | MINI Dynamics

The two most common materials used in brake rotors are cast iron and carbon fiber. (also known as Carbon-Carbon) Carbon fiber offers high thermal resistance with a low weight, but can be costly and is currently only used in the upper echelon of racing or as a high dollar option on a few ultra-premium vehicles. Cast iron is what typical rotors are comprised of based on a benefit-to-cost ratio.

There are three main types of cast iron with varying levels of graphite in the mix, Grey cast iron, CV cast iron, and ductile cast iron. Grey cast iron has high anti-abrasion capability and can be easily processed. Making Grey cast iron the most common material choice for mass-produced rotors. The downside is that it can be cracked or deformed when exposed to frequent drastic temperature changes. Ductile cast iron is number two on the list, and is an excellent material with similar tensile strength as steel. Another benefit to Ductile cast iron is its high resistance to expansion and contraction with temperature change. But its weakness is its low surface hardness that can lead to uneven wear when used in a brake rotor application, Ductile iron is brittle and can also cause noise under braking. Our last main type of cast iron is CV, or Compact Vermicular cast iron. CV cast iron falls almost in between Grey and Ductile, depending on the manufacturing process. Quality control with CV is very difficult resulting in an inconsistent material, occasionally bordering on Grey while other times being more like Ductile.

After extensive testing, DBA has derived a version of Grey cast iron with a unique blend of additives including higher levels of carbon (C) that achieve a higher level of durability and better resistance to sharp temperature changes than the typical Grey cast iron. This proprietary DBA mixture offers a higher FC200 rating versus only an FC150 rating of the standard Grey cast iron OE-type material. (FC ratings are used as a measurement of the strength of cast iron) This material leads to a superior rotor with more tolerance for sharp temperature changes, while still having a high surface hardness, as well as a high resistance to cracking and other distortions.

DBA 4000XS Series Rotors | MINI Dynamics

Brake rotors are most commonly offered in solid and ventilated designs. In many modern vehicles the front rotors are ventilated and the rears are solid, however, there are also many vehicles that offer ventilated rotors front and rear. Ventilated discs have a space between the brake surfaces that allow for airflow to pass through the rotor for cooling purposes. Solid discs don’t offer this feature, which is why they are frequently used in the rear of vehicles where the brake system is often under less stress. DBA 4000XS Series Rotors | MINI Dynamics

Vent designs come in 3 common styles, straight fin, curved vane fin, and DBA’s Kangaroo Paw pillar fin design. Straight fins allow for airflow, but when a rotor is spinning, the straight fin design doesn’t do much to help in extracting the heat from the rotor due to the perpendicular alignment of the straight fin compared to the center of the rotor’s rotation. A better option is the curved vane, which acts much like a fan blade, swirling the air and forcing it outward from the hub center by taking advantage of the spinning motion of the rotor during driving.

DBA 4000XS Series Rotors | MINI Dynamics

DBA rotors employ specifically designed pillars with a layout and post shape that works much like the curved vane when it comes to heat extraction, but offers even less obstruction to the airflow which reduces turbulence and increases the flow of hot air as it exits the rotor.

DBA 4000XS Series Rotors | MINI Dynamics

DBA 4000XS Series Rotors | MINI Dynamics

While slotted rotors may look cool, the real advantage of slotted rotors is an increase in braking power, in many cases up to 15-20 percent. Often slotted rotors have a higher resistance to brake judder, an increased cooling affect and a higher operating friction level. Sounds great right?

Unfortunately, all this magic comes with a price. Slotted rotors are more expensive to build due to the precision machining required which translates to a higher price tag. Also, slotted rotors have a tendency to be noisier during braking and will often wear through brake pads at a faster pace than solid faced rotors.

In an effort to eliminate the negatives and accentuate the positives of slotted rotors, DBA offers our new T3 slot design that addresses a few of these problems. The T3 slot design has a gradual overlapping curved design that is significantly quieter than straight slots virtually eliminating their inherent whirring noise during braking. The T3 slot shape also reduces the excessive brake wear by keeping the pad in constant contact with the rotor face, rather than allowing the slot to ‘cut’ material from the pad with each passing slot. While we’ve managed to eliminate some of the downside of slotted rotors, with the DBA T3 slotted rotors, you still get the good stuff like increased braking power, added cooling and a reasonable price.

DBA 4000XS Series Rotors | MINI Dynamics


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