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Stupid Question on a Future Sin - Pad Replacment w/o Turning Rotors

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Stupid Question on a Future Sin - Pad Replacment w/o Turning Rotors

 
Old 02-09-2017, 05:09 PM
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Mongo
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Question Stupid Question on a Future Sin - Pad Replacment w/o Turning Rotors

Before ya'll burn me at the stake here for this question, my brake rotors have less than 1,000 miles and do not have a groove on the outer portion of the disc that can catch a finger nail.

I purchased a pair of semi-metallic pads I am not satisfied with and want to ditch them for the stock formula. If the rotors are in good condition, is it worth just popping new pads in without turning the rotors given the aforementioned criteria above?
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Old 02-09-2017, 05:16 PM
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Sure, I do it all the time...

Guys who track their cars change pads at the track, and don't turn their rotors each time...

It may take longer for the pad to seat, though...
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Old 02-09-2017, 05:17 PM
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I assume I can take some 320 grit sandpaper to the rotor in a circular motion to promote seating then?
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Old 02-09-2017, 05:19 PM
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Originally Posted by Mongo View Post
I assume I can take some 320 grit sandpaper to the rotor in a circular motion to promote seating then?
I wouldn't...

Just drive carefully the first 100 miles or so as braking may be less than perfect... but I haven't ever noticed...

You said your rotors were fine, no groves? Correct?
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Old 02-09-2017, 05:39 PM
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No grooves. The only thing I can complain about are rusty hubs. I religiously wash the car even though it does not get out much.
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Old 02-09-2017, 06:06 PM
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Originally Posted by bpu699 View Post
Sure, I do it all the time...

Guys who track their cars change pads at the track, and don't turn their rotors each time...

It may take longer for the pad to seat, though...
The rotors on my track car have been used with a couple different sets of track pads and a few more sets of street pads. Never removed the rotors or did anything to them.
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Old 02-09-2017, 06:35 PM
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Yes, have done it many times on my 85 and 87.
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Old 02-09-2017, 06:37 PM
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Just put some pads on it, take it easy for a few hundred miles and drive the damn car buddy.
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Old 02-09-2017, 06:57 PM
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No need to if the rotors are in good shape and you weren't getting "wheel wobble" previously.
I put new pads all around on my 944 last year, rotors are from 2006, just did the normal "break in" procedure.
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Old 02-09-2017, 07:09 PM
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Originally Posted by SeanR View Post
Just put some pads on it, take it easy for a few hundred miles and drive the damn car buddy.
Yep. Something I am guilty of. My last odometer reading to my insurance showed less than 500 miles a year. I think there are 250 GTOs that are driven more than this 928 sadly.

Something that happens when you have a toddler that is into everything I guess...

Will do the pads this weekend when I throw in some fresh ATE brake fluid.
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Old 02-09-2017, 07:26 PM
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Andrew, you must replace the entire suspension system when changing brake pads.

Word to the wise.
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Old 02-09-2017, 07:29 PM
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Originally Posted by Randy V View Post
Andrew, you must replace the entire suspension system when changing brake pads.

Word to the wise.

Yes Dr Bob told me the same thing too when I did the steering rack. I am cash-advancing all my credit cards now.
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Old 02-09-2017, 09:46 PM
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Originally Posted by Mongo View Post
Yes Dr Bob told me the same thing too when I did the steering rack. I am cash-advancing all my credit cards now.
Yer hertin' me man!

My suggestion is that you follow the recommended bedding procedure for your new pads rather than just driving it so easy that the pads glaze to the smooth rotors.

I turned my original 928 rotors once, when I put the second replacement set of pads in the car. I was sweating a little, since most previous experiences had the shop turn the rotors to minimum or thinner just so they could sell me another set. This time I measured and marked them before they were loaded into the car. Then at the shop the tech and I remeasured and decided in advance what thickness they would be turned to. He hit the numbers dead on. The only reason I turned them then was the lip on the edge that the previous pads had worn in.

The next brakes went in with new rotors as part of a whole-system rehab, with calipers refurb'd and a very comprehensive flush-and-vacuum-bleed effort.


Bottom line is that your barely-used rotors will be fine if you bed the new pads correctly.

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If you are going to have things apart, paint the rusty hats now and get it over with. Rusty hats look like crap sitting inside those nice wheels. Paint is cheap.
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Old 02-09-2017, 11:51 PM
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Originally Posted by Mongo View Post
I assume I can take some 320 grit sandpaper to the rotor in a circular motion to promote seating then?
What everyone else said, but this does not hurt either. I do this to remove the old glaze from the rotors. Just a couple of quick turns of the rotor, holding the sandpaper in one place does the trick. Never had a problem.
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Old 02-10-2017, 12:03 AM
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For full absolution send $100 to Reverend Otto.
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