I heard that slotted and drilled rotors make brake pads wear much quicker due to the "cheese grating effect" ... to clarify, a cheese grater has holes in it that slice through cheese right? Well people say that slotted and drilled rotors have the same effect on brake pads, is this true??? I hope you guys understand what I am trying to say lol

 

Ive had some slotted and drilled on my car for about 1 year and the pads are doing just fine. just dont get some cheap $20 pads

 

they do increase wear, but not by a huge amount.

They do, though, usually end up getting hairling cracks around the drill holes, and then you get to buy new rotors.

Just get blanks.

Slotted+XD=

 

AP=Slotted+XD=


Yeah, wear is slightly more but pads (even good ones) are cheap for what they do... Get good pads.

 

AP rotors != fleabay crap drilled rotors.


Anything less than the discs with cast-in holes made by Brembo or AP (or equivalent) will eventually crack and fail. But keep in mind Brembo does not do any cast-in crossdrilling, except for the cases where they make the OEM parts like on Porsche, Mercedes, Ferrari, etc. Any of the "Genuine Brembo Crossdrilled rotors" you buy for a Maxima were all blanks that someone else drilled and put back in a Brembo box..

Imposters, I tell ya!!

 

_______________________________________________

" FAQ



Are discs with cast-in-place holes better than cross-drilled discs?
Brembo has extensively studied and tested cross-drilling versus casting the holes in place and found no significant effect on performance or durability."
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Funny thing is although I've had custom slotted/drilled done on blanks... I usually didn't have problems with cracking from the chamfered holes. But then again I don't put them in real race conditions and i'm careful of cool down and not hosing them down while hot for car washes...

 

just get blanks....less crap to worry about and they brake just as well.

 

Yeah...they both develop fractures equally fast. What else is the marketing department going to say about their own product? In an interview with Ferrari's (?) chief engineer, he said that they're basically for looks. His team would never use them in races - slots maybe, but not holes. Anyone verify this in photos?

 

Not debating whether or not the usefulness of crossdrilled aside lightening of the rotating mass. I use them for looks and better initial bite and don't mind the reduced surface area when i'm dealing with 13" rotors. Bottom line is for racing (or people who want to get modified brakes), brakes parts are "consumable" items and need replacing depending on use. You have to pay to play... Those that want the best bang for the buck: just get better pads and "normal" rotors.

 

Slots > holes. No cracking issues and far less surface area reduction.

Slots and holes will definitely chew pads a little faster. But dirt and grime will chew rotors if they don't have slots or holes to catch them. That's why, even though blanks always stop best, slots are best for the street if you want to replace your rotors as infrequently as possible.

I know I'm a little less lucky than most in this department for some reason, but when I had blank rotors they would get chewed to hell in a few thousand miles. Dirt would just get stuck between the rotors and the pads and score them to hell. Then I traded the blanks for slotted rotors and never looked back. My Brembo slotted rotors are on their third set of pads with no appreciable scoring (although they will definitely be replaced with this set due to normal wear).

 

Even with slotted you gotta check em and maintain that cheese grater. I found out the hard way.

 

It was my impression that the big advantage of slots is that they allow degassing under repeated extreme braking, which alleviates brake fade. It makes little/no difference in wear resistance. I'm betting that the reason your blanks wore faster was because they weren't the same quality as your Brembo slots.

 

That's what the manufacturers advertise. But given modern brake compounds -- i.e. anything decent made in the last 20 years or so -- in anything remotely resembling street driving, you're virtually never even going to see it, let alone is it going to matter much.

I don't even think our braking systems are good enough to produce that effect under any kind of driving before something starts overheating and causing bigger problems...

They were Brembo blanks, actually. But it's not that they wore faster. They developed some pretty deep grooves in the surface. I could drag a fingernail across the face of one of them (from the center out) and it would get caught in a few places.

 

agreed....slotted and drilled were originally made to vent gas buildup from organic pads, which cause alot of gassing when hot. hardly anyone uses organic pads anymore though...

 

Ive read slotted is reccomended only for racing applications as it eats up the pads much faster, cross drilled does not and can be used for regular driving. For this reason Id only put drilled if I was changing my rotors. I HATE cross drilled and slotted rotors.

 

Cross drilled rotors and slotted rotors both eat pads faster than blanks. Whether one is worse than the other is a matter of manufacturing processes, but you are unlikely to notice a difference with street driving.

Both types are "recommended only for racing" in that they won't actually make a difference in stopping ability for street applications. Drilled rotors are more common in racing than slotted rotors because drilling is a better way to reduce the weight of the rotor. But, either type can be used for regular driving if you accept the higher cost and faster pad wear.

 

let me tell u this...on my blank Raybestos rotors....it took 20-35 of hard track session braking to get brake fad....and that was only because my fluid was boiling.......no need for drills....slots arnt as bad but u pay more for rotors with holes or slots.....hmmmmmmmmm