The number one question we are asked at DBA USA is, “Can your rotors be turned or machined?”

Drilled And Slotted Rotors
Machining Drilled And Slotted Rotors Bearings
Machining Drilled And Slotted Rotors Replacement

You can cut or machine a drilled and slotted rotor. Just set your brake lathe to its slowest setting to avoid any chatter. Whenever replacing your pads, you’ll want to replace or cut your rotors, so the new pads can bed-in properly. However, if you want that non-directional cross-cut finish go with a new set of rotors from PowerStop. A drilled rotor has less metal content than a slotted rotor. The holes in the rotor help to get rid of excess water in the rotor when driving in the rain. When less metal is used in the construction of a rotor, it has less stopping power than a rotor with more metal content in its construction. Slotted rotors have more metal than a drilled rotor. Slotted rotors are more efficient at moving water away from the rotor when it rains. We have a guy who always brings his vette in w/ a baer upgrade and whants the rotors turned before carshows and events Re: Can cross drilled or slotted rotors be machine Sunday, October 23, 2005 8:13 PM. We cater to the car enthusiast who not only needs new brake rotors, but wants something different behind a nice set of wheels. Be it looks or performance, adam's rotors is the only company to bring you over 20+ machine pattern variations (most of which are exclusive to AR), 3 zinc finish offerings, and 5 ceramic hub coating options. Given the choice between drill holes and slots, the drill holes will give you better braking power over slots for normal city/highway driving. This is why high end BMW, Porsche, Corvette, and Mercedes rotors are drilled, not slotted. However, for track racing (high speed stops), slotted rotors are the better choice.

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The easy answer is yes, they can. Somewhere along the way, someone started saying that slotted rotors couldn’t be turned. This incorrect statement has become fact, or at least urban legend, so we wanted to try to clear up this misconception. If done properly, and with care, slotted and drilled rotors can be machined. Not all warped, worn or damaged rotors can be brought back from the dead, but more often than not, a proper machining job can breathe new life to your rotors and should be considered a viable alternative to replacement rotors in some cases.

To explain the proper method, we dug out this old technical sheet that best explains the process. You’re welcome! 🙂

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Unless you’re driving a high-end sports car, your car’s brake system is mostly likely equipped with blank brake rotors. Also called smooth or plain rotors, blank rotors work well for most of the driving population, so there’s little reason for most drivers to consider anything else, like slotted rotors. So, what are slotted rotors good for?

For most drivers, blank rotors offer the right mix of braking efficiency and thermal efficiency. If you’re a spirited driver, spend weekends at the track, or tow or haul regularly, slotted rotors can be an improvement. Most slotted rotors feature straight grooves crossing the brake pad path, usually at a tangent to the hub circle. Some slotted rotors also feature curved grooves.

Energy Conversion in the Brake System

The brake system is an energy conversion device. Using friction, the brakes convert kinetic energy (the momentum of your vehicle) into thermal energy (heat), which is absorbed by the brake pads and rotors. The heat eventually radiates to the air or is conducted to other parts of the vehicle, like the wheels, axles, bearings and knuckles. For the average driver, automakers build brake systems to handle a certain amount of heat, how much can be absorbed by the system and how fast it dissipates.

Heat Absorption: Because 70% of braking occurs in the vehicle’s front end, front brakes are heavier than rear brakes, enabling them to absorb more heat. Rear brakes don’t need to absorb as much heat, so solid rear rotors are still common on many vehicles. Some use old-style rear drum brakes for that reason.
Heat Dissipation: To dissipate heat faster, most vehicles are equipped with ventilated front rotors, using airflow to transfer heat to the air. For even more heat dissipation, heavy vehicles, sports cars and work trucks may also be equipped with ventilated rear rotors.

What Are Slotted Rotors’ Advantages and Disadvantages?

Slotted rotors are superior to blank rotors in some ways. Slotted rotor grooves offer two distinct benefits under heavy braking: brake fade, from high-temperature brake pad outgassing, can be significantly reduced, allowing gases to escape through the slots; and the grooves shave off thin layers of brake pad material, reducing glazing and improving braking consistency.

Still, slotted rotors have some disadvantages. Depending on the type of grooving, noises and vibrations are par for the course. The brakes are functioning properly, but their aggressive nature may be off-putting to some drivers. And because of the constant shaving action, brake pad life may be shorter than if they were mated with blank rotors. You may also have a hard time finding someone to machine slotted rotors, even if they’re thick enough to resurface. Some urban legends die hard — they’re just not as forgiving as blank rotors.

Slotted rotors are available for many vehicle types, even economy vehicles. If you’re hard on your brakes and you can stand to give up a little comfort and longevity, slotted brakes could be your ticket to better braking.

Check out all the brake system parts and accessories available on NAPA Online or trust one of our 17,000 NAPA AutoCare locations for routine maintenance and repairs. For more information on slotted rotors, chat with a knowledgeable expert at your local NAPA AUTO PARTS store.

Drilled And Slotted Rotors

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Machining Drilled And Slotted Rotors Bearings

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Machining Drilled And Slotted Rotors Replacement