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Old 08-25-2012, 12:43 AM   #1
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Slotted rotor sound question

Recently replaced the fronts with a 4 piston 14" slotted rotor and the rears with 13" rotor only...

I've read a lot of conflicting info and need my brake experts here to help me out.

5 - 20 mph with windows down, I hear a faint "Brushing" sound reflected off things as I drive by... No pressure applied to the pedal. No unusual clicks or squeaking under braking and they perform great... Is the light sound typical due to the slots? I did perform complete break in cycles with the new pads (Hawk HPS).

My mechanic said it was normal due to the slots and cross-thatching. Not sure I buy that.

Thanks.

Thanks!
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Old 08-25-2012, 01:11 AM   #2
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Honestly slotted/drilled rotors make a little more noise.
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Old 08-25-2012, 01:21 AM   #3
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Quote:
Originally Posted by gregtommy
Honestly slotted/drilled rotors make a little more noise.
Good to know... Just didn't want to find out my shop didn't align the calipers up right or something.
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Old 08-25-2012, 01:24 AM   #4
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Quote:
Originally Posted by nhcowboy

Good to know... Just didn't want to find out my shop didn't align the calipers up right or something.
Yeah ur fine, just as long as it isn't constant
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Old 08-25-2012, 01:26 AM   #5
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Quote:
Originally Posted by gregtommy

Yeah ur fine, just as long as it isn't constant
Well, that was my concern. It is constant. I just can't hear it beyond 30 mph due to wind/road noise. But it isn't a clicking or grinding...
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Old 08-25-2012, 01:29 AM   #6
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They may have not put brake quieter on the back of the pad which prevents the metallic squeak of the pad n the bracket.
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Old 08-25-2012, 05:43 AM   #7
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Mine do it. You get used to it after a while
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Old 08-25-2012, 08:08 PM   #8
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Re: Slotted rotor sound question

normal noise
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Old 08-25-2012, 08:15 PM   #9
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Thanks guys
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Old 08-26-2012, 03:26 PM   #10
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Re: Slotted rotor sound question

normal noise! it's the wind and air going through the slots
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Old 09-24-2012, 06:35 PM   #11
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Quote:
Originally Posted by nhcowboy View Post
Recently replaced the fronts with a 4 piston 14" slotted rotor and the rears with 13" rotor only...

I've read a lot of conflicting info and need my brake experts here to help me out.

5 - 20 mph with windows down, I hear a faint "Brushing" sound reflected off things as I drive by... No pressure applied to the pedal. No unusual clicks or squeaking under braking and they perform great... Is the light sound typical due to the slots? I did perform complete break in cycles with the new pads (Hawk HPS).

My mechanic said it was normal due to the slots and cross-thatching. Not sure I buy that.

Thanks.

Thanks!
I'm on the same boat as you. I had Steeda's slotted rotors kit installed last week (item 555-6015) and when I returned home from bedding in the rotors I could hear the same faint brushing sound as I was coasting in neutral with no brakes applied. My initial concern was that the pads might be dragging but the shop pretty much gave me the same response, that this sound is typical of slotted rotors. When braking the brakes sound/feel normal to me, or at least nothing catches my attention over my Borlas.

I'm still trying to find another Mustang owner with this same kit that can tell me if they're experiencing the same thing to ease my mind. You said you replaced the rotor only in the rear, you wouldn't happen to have the same kit would you?
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Old 09-24-2012, 06:41 PM   #12
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Not sure... It was the rear upgrade kit (13" rotor [dba], caliper relo bracket [had to pull the axles]).

I added hawk HPS pads.

Probably the same kit.
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Old 09-24-2012, 07:02 PM   #13
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It's a normal sound. I enjoy it personallu
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Old 09-25-2012, 09:42 AM   #14
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I'm still on stock rotors on the Mustang, but I switched to slotted on the last car & it's a normal sound. I ran those rotors for over 100k with no problems or unusual wear.
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