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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-01-2012, 09:23 PM   #1
willy3000
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Join Date: Aug 2011
Location: Sydney, Australia
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My Ride: BMW 2001 E46 320ci
Brake Discs

hi

im changing my brakes soon, just wondering if i have to change my brake discs as well? or can i just machine it down? if so how many times is it recommended to machine down for a brake disc?

thanks
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Old 09-01-2012, 09:27 PM   #2
Stinger9
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Location: New York
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My Ride: '04 330Ci
Rotors should be replaced with every pad change.
Plain quality rotors are the best and cheapest.
Start with www.Turnermotorsport.com

Axxis Metal Masters highly recommended by them.
I got'em. love 'em.
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Old 09-01-2012, 09:35 PM   #3
dwtaylorpdx
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I go through about 3 sets of pads per rotor. I never machine/turn them. I change the pads at 75%.
Rotors get changed when they are worn about 50% of their allowance or are showing surface checking.
If you change the pads more often, the rotors wear less. I always break fresh rotors in with seasoned
pads never new. I keep a 50% set in the shop just for breaking in the rotors (Hawk Blues)
They go on the car for a hour or two to burnish the surface then I put the new pads on and go break them in.


Just breaking all the rules...

Dave
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Old 09-01-2012, 09:42 PM   #4
Stinger9
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Let me know when you're coming.


I'm getting out of your way!!
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Old 09-01-2012, 09:48 PM   #5
dwtaylorpdx
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Its a track thing you wouldn't understand.....

Its pretty logical, replace the rotor when it needs replaced.
Replace the pads early so you don't overheat the pad and cook the rotor..

I learned this maintaining cars that break 160 at the track...
The changing rotors and pads as a set thing is a marketing hype dealer pull to take your money....

I dont do it blindly, the rotors get a dial indicator across the surface and I check for run-out and ripple each pad change.
Dave

Last edited by dwtaylorpdx; 09-01-2012 at 09:51 PM.
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Old 09-01-2012, 09:50 PM   #6
Stinger9
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Works for you, OK by me.

See you at NASCAR


Reading your post #7, in my lifetime I'll never come close to catching up to your automotive experiences.
Good times!

Last edited by Stinger9; 09-01-2012 at 10:50 PM.
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Old 09-01-2012, 10:05 PM   #7
dwtaylorpdx
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Nope.. Well OK I do maintain a couple sprint cars and a cosworth midget, but that's dirt not pavement. lol
I also handle a 200SX tubo, a 5.0 Mustang, 2 sentra school cars, a ACR neon, and help out on a variety of other road race cars...

Fastest car I ever worked the suspension on was a Z-07 comp corvette. clocked it at about 175 on the front straight at PIR (Portland International)

Cheers
Dave
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