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00Beast
 Post subject: Turnable Rotors?
PostPosted: Wed Nov 11, 2009 10:45 pm 
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So dad's GXP needs brakes, and I need to know how much material the rotors can have before they're not able to be turned. I have a digital calipers, so if anyone has the specs, it'll allow me to figure out what I need before I remove the rotors. Thanks in advance.

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harofreak00
 Post subject: Re: Turnable Rotors?
PostPosted: Wed Nov 11, 2009 11:08 pm 
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Front or rear? Usually with the rears its about the same prices to get new ones as they are to turn them.

Quote:
If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. Refer to Brake Pads Replacement - Front and/or Brake Pads Replacement - Rear .

Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.

Using a micrometer calibrated in thousanths-of-a-millimeter, or ten-thousanths-of-an-inch, measure and record the thickness of the brake rotor at four or more points, evenly spaced around the rotor. Ensure that the measurements are only taken within the friction surfaces and that the micrometer is positioned the same distance from the outer edge of the rotor, about 13 mm (½ in), for each measurement.

Compare the lowest thickness measurement recorded to the following specifications:
Specification - Front
Brake rotor (L36) minimum allowable thickness after refinishing: 31.08 mm (1.224 in)
Brake rotor (LD8) minimum allowable thickness after refinishing: 30.7 mm (1.209 in)
Brake rotor discard thickness: 30.7 mm (1.209 in)

Specification - Rear
Brake rotor minimum allowable thickness after refinishing: 10.25 mm (0.404 in)
Brake rotor discard thickness: 9.0 mm (0.354 in)

If the lowest thickness measurement of the brake rotor is above the minimum allowable thickness after refinishing specification, the rotor may be able to be refinished, depending upon surface and wear conditions which may be present.

If the lowest thickness measurement of the brake rotor is at or below the minimum allowable thickness after refinishing specification, the rotor may not be refinished.

If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification, the rotor requires replacement.

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00Beast
 Post subject: Re: Turnable Rotors?
PostPosted: Wed Nov 11, 2009 11:22 pm 
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Fronts, thanks Andrew.

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myfirstbonnie
 Post subject: Re: Turnable Rotors?
PostPosted: Thu Nov 12, 2009 1:05 am 
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I had the oe rotors on the front of my 2k turned for $8 each at our local Napa. That was with 97k miles on them.
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00Beast
 Post subject: Re: Turnable Rotors?
PostPosted: Thu Nov 12, 2009 9:18 am 
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Yup, that was my plan. I work at our local Napa Autocare Center, and NAPA is in the other half of the building. I just wanted to be sure that they were turnable before I find out they're not and then dad's car is down for 2 days waiting for parts.

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ChilinMichael
 Post subject: Re: Turnable Rotors?
PostPosted: Thu Nov 12, 2009 9:57 am 
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Less material on the rotor means it's more susceptible to warping. A lot of rotor "warping" actually isn't warping per say, but uneven buildup of pad material. This can be remedied by correct re-bedding of brakes, you can google that and print out a plan on how to do it. It usually involved a few 30-5mph stops then 60-5mph stops (I say 5 cause you cannot completely stop when you are bedding, the brakes get VERY hot and stopping 100% on a hot brake can spot the rotor. If you think your rotors are warped, first try this (make sure you have decent pads and know you will lose a bit of material from them) If you don't have vibration, DO NOT, I REPEAT DO NOT, turn your rotors. I can't tell you how many times I've heard people THINK that every brake job just for the hell of it they should turn their rotors...NO...WRONG...Wives tale! If you want your rotors to last you don't remove material from them! Also, I've seen many instances also where turning the rotor is dollars away from buying a new one...I'd go for the new one.
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00Beast
 Post subject: Re: Turnable Rotors?
PostPosted: Thu Nov 12, 2009 9:49 pm 
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Mike, the pads are squealing, and throwing out tons of dust, and they have almost 60k. It's time. Believe me, I know not to turn warped rotors. Why should I not have the rotors turned? IMO it gives them a better surface to bed-in on, and lasts longer.

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ChilinMichael
 Post subject: Re: Turnable Rotors?
PostPosted: Thu Nov 12, 2009 10:23 pm 
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Turning them removes a surface that's thicker and less likely to warp. Ruins rotor life. If you don't have vibration, it's best not to turn them....but of course...you may do whatever you like with your car :wink:

*add-in*

A very professional standpoint:

The point of machining rotors is to give yourself a smooth uniform braking surface for your pads to apply against. If your rotor surface isn't ridged or rusted or warped you are doing yourself a disservice by machining them for a couple reasons.
1. The surface left by a brake lathe is not as smooth as the surface left by the old brake pad IF the old brake pad had worn down properly. I have looked at dissected rotors of normal wear and machined ones at college with multiple instructors.
2. The brake pad material is much softer than a rotor material. Brake material wont embed itself in the rotors. Rotors can deteriorate over time leaving the surface material weak and rusty, but this is fairly obvious on visual inspection.If this is not the case, leave the rotor alone.
3. Turning a rotor removes metal from the rotor. This makes the rotor less of a heat sink thus making the rotor less effective and more prone to warping.
If you want or need to machine your rotors, by all means, go ahead, the brake shops love to see you at the counter. Just letting you know that it isnt necessary unless you have a braking or surface problem.


Last edited by ChilinMichael on Thu Nov 12, 2009 10:28 pm, edited 1 time in total.

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Jrs3800
 Post subject: Re: Turnable Rotors?
PostPosted: Fri Nov 13, 2009 7:24 pm 
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Ed are the rotors seriously grooved?
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01bonneSC
 Post subject: Re: Turnable Rotors?
PostPosted: Sat Nov 14, 2009 4:53 am 
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I have always had rotors turned, if there was enough material left to get em squared up, when putting on new pads and NEVER had any problems after the turning. And I have done it on customer cars when I was a mechanic. I have never ever just done a pad swap on a vehicle

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00Beast wrote:
Less off-topic than Lane's Heated Steering wheel, but yeah, back to the topic.
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xX3800Xx
 Post subject: Re: Turnable Rotors?
PostPosted: Sat Nov 14, 2009 1:28 pm 
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The discard spec is on the rotor. I dont turn my rotors I just buy new always. Just because I always end up destroying them. My current rotors are cracking and they arent even drilled and slotted.
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00Beast
 Post subject: Re: Turnable Rotors?
PostPosted: Fri Dec 18, 2009 1:14 pm 
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So, what's the consensus? Apparently I'm doing them tomorrow. So new rotors or re-use old rotors (not turned)?

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ChilinMichael
 Post subject: Re: Turnable Rotors?
PostPosted: Fri Dec 18, 2009 2:07 pm 
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Was the car shaking massively during braking the past few times you drove it? Run your fingers up and down the rotors from inner to outer, are they heavily grooved? If no to both, reuse. Try to follow a proper-bed in procedure. That's my opinion.
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00Beast
 Post subject: Re: Turnable Rotors?
PostPosted: Fri Dec 18, 2009 2:11 pm 
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No shaking, and they're not hardly grooved at all, IIRC. I'll give them a once-over tonight and decide the plan of action.

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2000Silverbullet
 Post subject: Re: Turnable Rotors?
PostPosted: Fri Dec 18, 2009 2:15 pm 
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I never machine my rotors for the reasons mentioned.
They are very cheap to replace compared to the older rotors like my Bird has with integral bearings. I even replace those when time.

Less material = more prone to warping.

Rust inside the rotor vents impede heat transfer also. :wink:

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01bonneSC
 Post subject: Re: Turnable Rotors?
PostPosted: Fri Dec 18, 2009 6:42 pm 
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The reasons I turn are to get rid of the glazed surface on the rotor, so you have a better pad to rotor mating surface. I say no to just a pad swap. But if you dont wanna turn em then buy new.

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00Beast wrote:
Less off-topic than Lane's Heated Steering wheel, but yeah, back to the topic.
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00Beast
 Post subject: Re: Turnable Rotors?
PostPosted: Fri Dec 18, 2009 8:06 pm 
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Ugh, the rotors are shot. Just called NAPA, hopefully they can get on the truck in the morning...

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ChilinMichael
 Post subject: Re: Turnable Rotors?
PostPosted: Fri Dec 18, 2009 8:57 pm 
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How do you know they are shot?
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00Beast
 Post subject: Re: Turnable Rotors?
PostPosted: Fri Dec 18, 2009 8:59 pm 
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I'll get pics when i take them off. There is a huge ridge on the back of the rotor, and the pad is more than likely gone. I might buy new slide pins, because the back is way worse than the front.

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ChilinMichael
 Post subject: Re: Turnable Rotors?
PostPosted: Fri Dec 18, 2009 9:05 pm 
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Make sure when you put the slide pins in that you grease them properly with the right stuff...I had the same issue with my last set of pads so don't feel bad.
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Portal » Board index » Mechanical and Maintenance (no chat or performance) » Bonneville GXP/Northstar Powered Cars

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