Brake wear

[ozgti]

Why should we avoid drilled rotors?

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[pjam73]

Why should we avoid drilled rotors?

https://www.youtube.com/watch?v=78wbht355R8

[Lucas_R]

Why should we avoid drilled rotors?

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They are more likely to crack (hairline cracks around the drilled holes)

[brad]

Why should we avoid drilled rotors?

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The drilling process sets up stresses in the metal which lead to hairline cracks radiating from the drill holes.

if the holes are part of the forging process and stress relieved after maching, they are OK.

[Umai Naa!!]

The holes can also fill with brake dust, causing hotspots which lead to cracking.

[Antiplastix]

Every motorcycle I've had has had drilled rotors. They have done track days, been subjected to greater braking forces than most cars and never had an issue. I'm calling "male cow faeces" on this one.

[Umai Naa!!]

Bike brakes are out there in the open air.

Car brakes are more suceptable to heatsoak, and a general lack of ventilation when you push them beyond their capabilities.

[neil]

Wow you guys must be hard on brakes. I've done 93k and still on first set of pads and rotors and still have plenty left according to my mechanic. But I have a manual and so I change down a lot instead of braking a lot of the time.

They must be all city drivers wasting their lives in traffic , still have original front brakes with 180,000 km , rears replaced at 160,000km.

[brad]

Every motorcycle I've had has had drilled rotors. They have done track days, been subjected to greater braking forces than most cars and never had an issue. I'm calling "male cow faeces" on this one.

Do what you want.

Motorcycle brakes are generally much thinner, solid (rather than vented), floating and a different metallurgy to car rotors. Motorcycle rotors are generally dealing with ~150-300kg of mass, rather than 1000kg-2000kg.

As I said, if the holes are cast/forged in place and stress relieved (like on a Porsche) they are fine. If they are machined (drilled) then not so great although for looks and general bopping about the suburbs they are fine.

Google it.

[Martin]

Every motorcycle I've had has had drilled rotors. They have done track days, been subjected to greater braking forces than most cars and never had an issue. I'm calling "male cow faeces" on this one.

DBA (Oz brake company) even mention the problem in this article:
Rotor Damage | Basic Guide Pt 2 - Disc Brakes Australia

3. Brake Rotor Cracking
When cracking occurs, its practically the end of your disc brake rotors.
While drilled rotors offer loads of performance braking improvements, they are also more prone to cracking.