PowerStop® - Drilled and Slotted Rotor

Hummer H2 2003-2009, Drilled and Slotted Rotor by PowerStop®. You don’t need to decide whether to use cross drilled or slotted rotors. Power Stop offers these high-quality rotors with both technologies, as well as OEM-style internal venting. Improve convective cooling with cross drilling, and performance in panic stops with slots.

Features:

• Cross drilled holes keep brake rotors up to 180°F cooler
• Slots sweep a clear contact patch between the pad and the rotor
• Increased braking performance under extreme heat and in the rain
• Internally vented
• Reduces fade
• Looks great behind custom (or factory) wheels
• G3000 grade cast iron
• Silver zinc finish
• 3 years / 36,000 mile warranty when Power Stop rotors and pads are used together

Power Stop combines the best of two technologies by cross-drilling and slotting. Don’t try to reuse your old discs, even if they still have enough meat on them after refinishing them to meet minimum thickness specifications. A thinner disc is a disc that has less mass. And it takes lots of mass to dissipate heat in a hurry, so get a pair of Power Stop vented, drilled, slotted discs at the same time. Mass soaks up heat quickly during a panic stop, but it takes surface area and moving air to keep the rotors cool on a long downhill or in heavy stop-and-go traffic. Cross-drilling a disc adds surface area for improved cooling, but it also makes a dramatic improvement in braking performance in the rain. Cross drilling keeps water from wedging between the pad and disc surface, making the pad hydroplane, which severely affects braking ability.

Slotting does help some in the rain, although it has other advantages. During a high-speed stop, especially with a trailer or heavy load, the organic binders in the pad material will literally boil. This is normal; the problem is that the outgassing binder turns the pad into a hot little air-hockey puck that barely touches the disc surface. It rides on a pocket of outgassing binder, keeping the pad from contacting a normal, unslotted disc. Slots sweep the gases away, letting you glide to a normal stop in time instead of running that red light at the bottom of the hill with both feet standing on the brake pedal.

Power Stop rotors use only the finest blanks and feature G3000 grade cast iron from the best foundries. Most foundries lower carbon content to increase tensile strength and hardness. Power Stop rotors have a carbon content that is 3% more than competitive brands, while maintaining a 210 Brinell hardness and 250 MPa tensile strength. The cast iron’s microstructure is an ideal homogenous matrix of perlitic and graphite flakes. All drilled and slotted rotors (except for hub rotor assemblies) are silver zinc plated to resist rust. Some competitors use cadmium plating that is highly toxic, and a significant cancer risk. Cadmium is banned in Europe and with all major vehicle manufacturers.