Yes, drilled brake rotors can crack, and it is a well-documented failure mode. Any hole machined into a rotor's face removes material and concentrates stress at its edges, so repeated heating and cooling can eventually open a crack right at that point. On a street-driven vehicle with a quality rotor and correct pads, the risk is low. Under track use, towing, or very hard repeated stops, it rises, which is why some brake makers steer that use case toward slotted or plain rotors instead.
Why Holes Turn Into Cracks: Stress Risers and Heat Cycling
A brake rotor's job is to soak up the heat of friction and shed it before the next stop. Every hole drilled through the rotor face removes a small patch of that heat-soaking material and leaves a sharp edge around the hole. That edge is a stress riser: a point where thermal expansion and contraction concentrate force far more than they do across a smooth, solid section of iron.
EBC Brakes, which has built dimple-drilled rotors since the 1990s, states that full through-drilling of a disc has been shown to promote rotor cracks, which is the reason the company developed a shallow, non-through-drilled dimple as an alternative. The physical explanation lines up with ordinary materials science: a through-hole in a rotor subjected to rapid heat-up-and-cool-down cycles is a textbook stress concentration point, and cast iron, while strong under steady load, has little tolerance for repeated stress at a sharp edge.
This does not mean every drilled rotor is a time bomb. It means the drilling pattern, hole-edge finish, and how hard the rotor is worked all decide whether that stress riser ever actually turns into a visible crack.
Cross-Drilled, Dimple-Drilled, and Slotted: How the Three Designs Differ
Not every rotor with holes or grooves carries the same risk. The three common performance patterns manage heat and pad gas in different ways:
| Design | How it works | Crack risk | Best suited for |
|---|---|---|---|
| Cross-drilled (through-holes) | Full holes bored through the rotor face to vent pad gas and shed heat | Highest; holes are stress risers at both faces | Street driving on a quality rotor; not recommended for track |
| Dimple-drilled | Shallow pockets that vent gas without boring all the way through | Lower; the rotor face stays structurally continuous | Street and spirited driving |
| Slotted only | Shallow grooves cut across the face to clear gas, dust, and water | Lowest of the performance patterns | Track days, towing, and high-heat repeated braking |
Power Stop, which sells drilled-and-slotted rotors for daily-driven trucks and cars, positions drilled rotors for normal city and highway driving, while for track racing and other high-speed, repeated-stop use it points to slotted rotors as the better choice. Power Stop also chamfers (rounds) the edges of its drilled holes specifically to reduce the stress-riser effect described above, rather than leaving a sharp machined edge for a crack to start at.
What a Developing Crack Actually Looks Like
A crack from heat cycling almost always starts at a hole or slot edge, not in the middle of a smooth section of rotor. Look for:
- A thin line running from the edge of one hole toward another hole, or toward the outer edge of the rotor
- A crack visible on the rotor face but not felt as a pulsation yet (catch it here, before it grows)
- Discoloration (blue or straw-colored) around the hole, which signals the metal has been overheated repeatedly at that spot
A crack that stays small and shallow is a wear item to monitor; replace the rotor before it is allowed to grow across the braking surface, since a rotor that fractures under load can take pad contact and stopping power with it.
When Drilled Rotors Are a Non-Issue, and When to Skip Them
For the overwhelming majority of daily commuting, a quality drilled or drilled-and-slotted rotor from a reputable brand, installed with the correct pads and properly bedded in, will outlast the vehicle's normal service interval without a crack ever forming. The failure cases that show up in the field cluster around the same few causes: cheap, unchamfered castings; aggressive repeated hard braking that never lets the rotor cool between stops (mountain descents, track days, trailer towing on grades); and rotors that were already overheated and glazed before the crack appeared.
If your vehicle regularly tows, autocrosses, or sees track days, a slotted-only or OE-style blank rotor paired with a more aggressive pad compound is the safer long-term choice. If your use is normal street and highway driving, a drilled or dimple-drilled rotor is a reasonable choice and the cracking risk discussed above is a low-probability event, not an expectation.
It is also worth remembering that holes are a stress concern on any rotor, performance-drilled or not. In 2026, Tesla recalled a small number of Cybertruck units after finding that the factory stud holes (not aftermarket cooling holes) in certain 18-inch-wheel brake rotors could crack under rough-road and cornering loads, risking a wheel stud separating from the hub. The fix was a redesigned rotor and hub with improved hole geometry. The lesson carries over directly: a hole of any kind in a rotor is only as safe as the engineering around its edge, which is exactly why reputable aftermarket drilled rotors chamfer their holes and cast from certified blanks rather than cutting corners on either.
What to Replace Alongside a Cracked Rotor
Rotors are sold and should be replaced as an axle pair, not one side at a time, so braking stays even side to side. If a rotor cracked from heat, inspect the pads on that axle for glazing or uneven wear and replace them together with the rotors; a glazed pad on a new rotor will just re-create the same heat problem. Browse brake rotors for axle-pair replacements, or Power Stop drilled-and-slotted kits if you want the cooling benefit of a performance rotor built with chamfered holes from the start. Pair any rotor swap with fresh brake pads rather than reusing worn ones.
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Shop Brake Rotors →Frequently Asked Questions
Are cross-drilled rotors safe for daily driving?
Yes, on normal street and highway driving a quality cross-drilled rotor from a reputable brand is safe. The cracking risk discussed above shows up mainly under track, towing, or very hard repeated-stop conditions that heat the rotor far beyond a daily commute.
Is a small crack in a drilled rotor dangerous?
A shallow crack confined to one hole edge is a warning sign to replace the rotor soon, not an immediate failure. A crack that has grown across the braking surface, or that you can feel as a pulsation through the pedal, should be treated as unsafe to drive on.
Do dimple-drilled rotors crack less than cross-drilled rotors?
Generally yes, because a dimple does not bore all the way through the rotor face, so the braking surface stays structurally continuous. A full through-hole removes more material and creates a stress riser on both faces of the rotor.
Should I buy slotted or drilled rotors for towing?
Slotted-only or blank rotors are the safer choice for regular towing, since sustained high heat from hauling a trailer is exactly the kind of repeated thermal cycling that raises cracking risk on a drilled design.
Can a cracked rotor be resurfaced instead of replaced?
No. Resurfacing removes surface rust and minor glazing, not a structural crack. A cracked rotor should be replaced, ideally as an axle pair.
Does a drilled rotor warranty cover cracking?
Some brake rotor makers do cover cracking under their standard warranty terms; check the specific manufacturer's warranty documentation for the rotor you buy, since terms vary by brand.
Sources
- EBC Brakes - GD Sport Rotors - dimple-drilling versus through-drilling and why through-drilled holes promote rotor cracks
- Power Stop - Drilled vs Slotted Rotors, Which Is Better - when drilled rotors suit street driving versus when slotted suits track use
- NHTSA Recall 26V255000 - 2024-2026 Tesla Cybertruck brake rotor stud-hole cracking, cause, and remedy