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Slotted rotors noisy?

MBruneaux

MBruneaux

New member
I've read a couple places where people say that at low speed they can hear what sounds like a "flutter" from their slotted rotors? Has anyone experienced this or heard of it? thanks
 


I have drilled and slotted rotors and they do make a noise as you discribed. its so faint though you would never hear it with the windows up. only time i can hear is when driving by parked cars or a wall the sound bounces off of them.
 


Well consider that the more you upgrade the front, the more you move the brake bias to the front.

Theres only so much traction in the front and if you have too much brake force in the front compared to the rear then the fronts will lock up first.

I'd just do the 12's and the stock calipers for now and see if you like that.

But before that again, I'd try a higher performance pad first.
 
Slotted rotors only make a notable whirring sound under heavy braking. With regular driving you'd be hard pressed to make out any sound whatsoever with the windows up.
 
Ive got drilled & slotted rotors. They hum when you hit the brakes really hard, other then that, there is no difference besides better stopping power and less brake fade
 


OrangeL67 said:
there is no difference besides better stopping power and less brake fade
Click to expand...

How does having slots/holes increase the coefficient of friction of your pad?

pad fade is probably what you're experiencing and that's fixed by getting higher temp pads.

If you REALLY want to cool things down, create a venting duct for your brakes. that'd really keep the fade at bay.
 
matt5112 said:
How does having slots/holes increase the coefficient of friction of your pad?

pad fade is probably what you're experiencing and that's fixed by getting higher temp pads.

If you REALLY want to cool things down, create a venting duct for your brakes. that'd really keep the fade at bay.
Click to expand...

I have ran durulast Gold C-max pads on my car since the fiirst week I bought it. I changed over to DSR's after about a year and a half.

The drilled holes allow air to circulate through the actual brake rotor, which does intern keep temps quite a bit lower, probably as low, or lower than a vent duct could. The slots take away the smoothness of the rotor surface, and the edges create friction that helps the pads grab on better, but studies have shown that it also wears your pads down quicker. So Yes.. Better stopping power and less brake fade
 
OrangeL67 said:
I have ran durulast Gold C-max pads on my car since the fiirst week I bought it. I changed over to DSR's after about a year and a half.

The drilled holes allow air to circulate through the actual brake rotor, which does intern keep temps quite a bit lower, probably as low, or lower than a vent duct could. The slots take away the smoothness of the rotor surface, and the edges create friction that helps the pads grab on better, but studies have shown that it also wears your pads down quicker. So Yes.. Better stopping power and less brake fade
Click to expand...

Did you change pads at the same time as rotors?

Did you notice an increase in the brake preformance when changing pads and rotors or just rotors?

And holes actually decrease the velocity of the air travelling through the venting vanes. Less velocity, less cooling.

Slots are only supposed to aid in removing of gases, but gases only build up when you're bedding the pad, not after you'd bedded them.

The pads rely on something to make contact with, you decrease this surface area, you decrease the total possible braking force.
 
There are performance merits for slotted and/or drilled rotors in wet weather conditions in which water is cleared from the pad/rotor interface. With slotted rotors you get better initial bite, but the slots have a cheese grater effect on the pads, thus accelerating their wear. From my understanding the cheese grater effect provides a persistent "fresh" pad surface during braking which deters glazing of the rotors/pads during heavy use. That being said unless you're putting your car through racing conditions or have an issue with wet weather braking, you'll be hard pressed to extract any benefit from a slotted rotor.
 
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