tjkj2002 wrote:
jinstall wrote:
I have been running slotted rotors for more that 7 years now, it does cause more brake dust, I have been cleaning the wheels to prove it. I have had this conversation as well with Brembo and Mov'it at the several auto shows, they have all agreed on the fact that it does cause premature wear and more brake dust on wheels. More friction causes more wear which causes more dust. Friction and heat and something has to give, that would be the pad. The turns into dust, if you increase the friction then you increase the wear which turns into dust from a pad that was solid now turning into dust. Cross-Drilling only increases the rough braking surface even more.
I drive the KJ everyday and the wheels are black in a matter of 72 hours. The stock brakes did not do that. The race car uses slotted rotors and the brake dust comes off in dropletts. ne weekend and the wheels are completely black.
Some pads create more dust then others.It is impossible for a rotor to great more dust,all that dust is from the pads no matter how the rotor is made.If your getting dust from the rotor you use you got some major issues that need to be addressed.
Oh and cross drilled rotors serve no other purpose then to reduce braking surface and reduce rotational weight,no other benefit is seen from cross drilled rotors.They actually reduce braking performance and are prone to cracking,more so when used in a daily driver.
For slotted rotors 99% of DD use will not warrant slotted rotors as modern pads do not "out gas" like older pads.During extreme use slotted rotors do help keep pad glazing down like in racing and rock crawling where the rotors do not get time(or the air flow) to cool down properly.
For once you finally said something correct "For slotted rotors 99% of DD use will not warrant slotted rotors as modern pads do not "out gas" like older pads.During extreme use slotted rotors do help keep pad glazing down like in racing and rock crawling where the rotors do not get time(or the air flow) to cool down properly"
Cross drilled rotors that are done correctly, do serve a purpose and provide better braking, but they have to be CAST with the holes in them, not drilled. Brembo is a prime example of this. They cast their rotors with a majority of the hole in the rotor and then finish the opening with a special machine. The holes provide cooling and water wiping during rain. That is why they are OEM on perfomance cars. Yes they are prone to cracking but when they have reach a hole to hole crack they have usually been run out by then. I have used drilled rotors for one season, unless they are Brembo, AP Racing or OMP, I will not go back to them. When used as a DD rotor they can last just as long as any other rotor, stop by any Porsche Boxster and take a look at it. Staring around the holes is normal.
Again, I disagree about rotor surface not adding to the wear on pads. Take your hand and drag it across a flat baking pan, did you loose any skin? Try it over a chesse grater, sis the same thing happen? I will take 15 years of racing, engineers from OMP, AP Racing, Brembo, Mov'It, Porsche, Ford Europe, Opel, VW and Audi have all told me the same thing about brake rotor surfaces and added brake dust/Pad wear, if it is not a smooth surface, then it will cause additional wear.
Sorry if you cannot understand this but if you get the mentioned above kitchen items I think you will understand very quickly what is being said.