when to turn rear rotors

Z28Justin · 08-10-2009, 09:12 AM

Hey guys, I did a search and didn't see anything about this. It's time for a brake job and am definately getting my front rotors turned. Is it worth it to get the rear too? I'm curiouswhat you guys have done

thewalrus · 08-10-2009, 09:22 AM

Are they warped? If they are not, then why have them turned? If they are warped badly, then just replace them, they dont cost much, the fronts are about 35 a piece, and the rears are about 30.

**Texas WJ** · 08-10-2009, 10:11 AM

I doubt they need to be turned. When you replace the pads check to see if they're scored badly and if they are then have them turned, but you shouldn't really need to at this point. I would check the fronts before assuming they need to be turned as well.

How many miles are on the Jeep?

ryanlberg · 08-10-2009, 11:15 AM

Lame ? i know how do can you tell if rotors are warped

thewalrus · 08-10-2009, 11:22 AM

Does the Jeep shake with heavy brake usage?

mjonesjr · 08-10-2009, 11:23 AM

To properly do a brake job you need to have the rotors turned. You should have the rotors turned every time you replace the brake pads.

Turning a rotor that is warped will not remove the warp. Turning a rotor is for removing the grooves in the rotor that is caused by debris that is trapped between the pad and the rotor. If the grooves are not removed, then they will decrease the life of the new brake pads.

BlueSteelJP · 08-10-2009, 12:04 PM

Quote:

Originally Posted by mjonesjr

To properly do a brake job you need to have the rotors turned. You should have the rotors turned every time you replace the brake pads.

Turning a rotor that is warped will not remove the warp. Turning a rotor is for removing the grooves in the rotor that is caused by debris that is trapped between the pad and the rotor. If the grooves are not removed, then they will decrease the life of the new brake pads.

Turning or lathing the rotors does accomplish what you stated but it also does even out the high side of the rotor, so yes it does remove the warpage.

BonesWK · 08-10-2009, 12:53 PM

would bad rear brakes cause a vibration to happen at higher speeds?

Mine is getting the rears done this week

mjonesjr · 08-10-2009, 01:09 PM

Quote:

Originally Posted by BlueSteelJP

Turning or lathing the rotors does accomplish what you stated but it also does even out the high side of the rotor, so yes it does remove the warpage.

It would take a very minor warping to be able to turn it out. If it was on the rear, you wouldn't even notice it.

Any considerable amount of warpage wouldn't be able to be turned out.

DarrylFlynn · 08-10-2009, 02:27 PM

Quote:

Originally Posted by Z28Justin

It's time for a brake job and am definately getting my front rotors turned.

WHY?

Unless there is a significant amount of DEEP scorong or wear there is no need to do this.

In addition, depending on the width of the original Discs, if you have them skimmed ( TURNED in the US ) they will naturally be thinner and WILL warp much easier.

If they look tired REPLACE them, it 's cheap to do and less hassle than having them skimmed.

Your choice. Cheers Darryl

merlinTec · 08-10-2009, 05:04 PM

Hi
I always recommend this done if you do have brake judder as it matches the disc (rotor) to the hub. If you just replace the rotor and the hub is not true you will get brake judder again. Not straight away as the the slider in the caliper will absorb it but as time goes on when the brake is not applied the pads will be rubbing on this high spot and will give you disc variance that you will then feel as brake judder. Hence why warranty covers brake skimming over replacement not to cut cost but to match the rotor to the hub so the fault doesn't return. Note even though the hub is giving you the run out it may well be ok and within spec when you think how small the rub is compaired to the rotor. A 1mm run out on a hub could well be 3mm on the rotor and a replacement hub could be the same.

trevbigred13 · 08-10-2009, 06:50 PM

Ok coming from working at a car shop you have two options when you get a break job:

1. just replace the pads

2. replace pads and turn/replace rotors

the problem with turning or resurfacing the rotors is that these days many factor rotors dont have enough metal to properly take enough off also as people said the smaller the amount of metal there easier it is to warp. If you rotors are warped it is very important to change the pads to not mess up the turned rotors too fast but by turning rotors its just delaying a problem till another time. I would suggest to look and see if you tire spins freely without metal to metal contact and the rotor face is level if thats the case just change pads

Z28Justin · 08-10-2009, 07:01 PM

I wouldn't mind just buying new rotors but I went to autozone and they quoted me at $80 a rotor, maybe he was looking at the wrong thing. My Camaro's rotors were like $20 a piece. Maybe I need to check a couple other places in town. There are 67K miles on the Jeep. It does shake a bit under braking that's why I was going to get the fronts turned and I know the rears don't do as much braking so I didn't know if they would really need it or not.

konarider94 · 08-10-2009, 07:08 PM

Quote:

Originally Posted by DarrylFlynn

WHY?

Unless there is a significant amount of DEEP scorong or wear there is no need to do this.

In addition, depending on the width of the original Discs, if you have them skimmed ( TURNED in the US ) they will naturally be thinner and WILL warp much easier.

If they look tired REPLACE them, it 's cheap to do and less hassle than having them skimmed.

Your choice. Cheers Darryl

hah skimmed. i also think its funny that its called turning though...as it actually is a facing operation.

Z28Justin · 08-11-2009, 10:05 AM

I just called another local parts places and they quoted me a $56 a piece for the front rotors and $50 a piece for the rears. It's $10 a piece to turn them. Where are you guys finding these for $30??