Brake time!
Posting Guru
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From: Rossmoor at Seal Beach
Although not turning the rotors makes it very hard to bed in the pads. In some case the pads will glaze if you don't turn the rotors then you have a bad case of the squeals and end up having them turned anyway. Turning also eliminates any warpage run out, that might be there.... while you have it torn apart anyway spend the time and the few extra bucks and do it right.
Veteran/Sheepdog
Joined: Feb 2012
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From: Western AR
I used to work in a brake shop. I routinely do not turn the rotors on my vehicles unless there are grooves, and I have never had any brake squeal. That said, if you turn them, you are significantly increasing the risk of warping them by decreasing thickness. Many rotors today are made so thin they can barely be turned once.
Most shops will not take off the "least amount necessary". They take off too much in most cases. Now if you are going to turn them yourself, that would be a different story...
Mike
Most shops will not take off the "least amount necessary". They take off too much in most cases. Now if you are going to turn them yourself, that would be a different story...
Mike
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Master of Strokes
Joined: Mar 2007
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From: CA
My EBC pads came yesterday from Riffraff Diesel performance and man what fast shipping they got! I got to say these brakes look awesome!
I got new stock Ford rotors for the front and I am going to turn the rear.
I got new stock Ford rotors for the front and I am going to turn the rear.
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Master of Strokes
Joined: Mar 2007
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From: CA
Hotshot
Joined: May 2005
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From: Stevens Point, WI
What do cross drilled and slotted rotors do?
Senior User
Joined: Jul 2009
Posts: 246
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From: Lynnwood, WA
When you are stopping heat and gases are created from the friction. The slots and/or holes allow the heat and gases to escape. Allowing for better braking and longer rotor life.
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Hotshot
Joined: May 2005
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From: Stevens Point, WI
Where is the gasses coming from? We don't run asbestos pads anymore that produce "gasses". Heat? Heat is what stops the vehicle. Without heat there would be no friction and without friction there is no stopping.
Senior User
Joined: Jul 2009
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From: Lynnwood, WA
Well, the rotors can only take on so much heat. Wouldn't you want to displace this so that more can be transfered in? I have experianced brake fade.
Are you saying that slotted/drilled rotors are a marketing gimick?
Are you saying that slotted/drilled rotors are a marketing gimick?
Hotshot
Joined: May 2005
Posts: 13,484
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From: Stevens Point, WI
The reason all newer rotors are split in the middle is for air cooling. Drilling holes in them doesn't help them cool it just takes away more material that would have soaked up the heat and pulled it away from the pads.
If cross drilled and slotted was good don't you think the guys that race would use them?
If cross drilled and slotted was good don't you think the guys that race would use them?
Senior User
Joined: Jul 2009
Posts: 246
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From: Lynnwood, WA
True, I also noticed how small the vains are on these. I am not convinced that the holes have no value. I looked up 7000.00 carbon ceramic rotors and they are drilled. I can't image they do it for looks.
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Master of Strokes
Joined: Mar 2007
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From: CA
That's what I have in the 7.3 and I wanted to try something different.
Posting Guru
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From: Rossmoor at Seal Beach
I have to interject here Let's get the facts of Physics straight... Heat does not create friction.... Friction creates heat..... Friction comes in three basic forms the types we are dealing with here are profile, and induced friction... If it was possible to create friction by inducing heat, then you could stop a car by heating the rotors with a torch???? not heat decreases friction by causing expansion of ambient gasses... in other words the oxygen molecules that pass between the rotor and the pad, become excited by the heat produced by friction, cause them to move more rapidly thus expanding the area that they take up... That is why heated air is less dense than cold air.... Drilling and slotting does indeed alleviate some of the pressure between the rotors and pads, creating better gripping power.... As for the race teams not using this well that is a 50/50 deal... some stick with the solid rotors due to cracking that is common in the Drilled rotors, and also due to the faster wear that the slotting and drilling creates.
Ps. I used to teach this stuff to college students for a living.