Should I turn my Rotors?

Nissan 300ZX technical discussion forum: Maintenance, performance, installations, modifications, how-to's and troubleshooting.
zitupbaby
Posts: 45
Joined: Tue Mar 27, 2007 11:05 am
Car: 1993 nissan 300 zx, 91 nissan nx2000

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Hey Guys

Well i am running out of money here and looking I guess to cheap out

My front rotors are warped, and I am not sure I can swing the $65 each, the goober at autozone said they turn rotors for $10

Here are the expenses I am looking at before anyone gives me too much s***:

Needs to be done yet:
new radiator
new tires
new rotors
new transmission mount
possible maf
new wiring harness
tps sensor

All The Best, & thanks for the advice - also if you have any links for this stuff let me know.

Nick


robomatic12
Posts: 672
Joined: Sun Jul 12, 2009 12:05 pm
Car: 1990 300ZX TT

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Aslong as the rotors are not thinner than their spec'd limit then it's fine to have them turned. This is a common practice in everyday auto shops. Unless the rotors are too thin, get em turned!

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es.biggs
Posts: 2120
Joined: Sat Feb 20, 2010 10:32 am
Car: 1990 300ZX 5sp NA
Location: Charlotte, NC

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+1 nothing wrong with that! I'd suggest bringing the rotors to a shop on the way to AutoZone to see if they are within spec, or in other words to make sure they are thick enough. Somebody should be able to measure them for you for free really it would take 30 seconds if you just bring them into the shop.

Your front rotors are 30mm from factory, and the minimum spec for them is 28 mm. I can't remember how much is taken off typically when the rotors are turned, but I think it's somewhere around .5 mm?? Maybe less? It's been a while since I've done it.

PS - make sure the guy doing the work on your rotors knows what he's doing - it's easy to ruin a perfectly good pair of rotors in a couple of seconds.

dudewtf
Posts: 25
Joined: Thu Mar 03, 2011 2:31 am
Car: 1990 300zx N/A 2+0

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How do you know if your rotors are warped? I think mine are but haven't the time to check them out now do I know what to look for

zitupbaby
Posts: 45
Joined: Tue Mar 27, 2007 11:05 am
Car: 1993 nissan 300 zx, 91 nissan nx2000

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Mine are so bad I can hear them rubbing unevenly when I brake, otherwise you can take them to a shop they have a tool that checks it.

New Jersey
Posts: 127
Joined: Tue Nov 16, 2010 9:09 am
Car: 1997 Infiniti Q45
1990 Nissan 300ZX

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ive read all sorts of crazy opinion on this.
turning a rotor is often not done correctly resulting in problems
turning a rotor invites future warpage due to their being less mass to handle the same heat
warped rotors can cause wheel bearing failure etc
new rotors are already so cheap this seems like too small a thing to skimp on.
kinda like the federal budget and the moroons wanting to cut 60bil outta discretionary spending when all the money is in military and enitlements

CrazedZ32Owner
Posts: 411
Joined: Fri May 28, 2010 11:59 am
Car: 91 Z32 TT(no motor), 2008 350Z Nismo, 05 Pontiac Sunfire speed machine!!! :)
Location: Lehigh Valley PA

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easy guy this is the tech section lol....

shaving material off of rotors?? sounds no beuno to me, if you have another car i say park the Z, what you have listed that needs to be fixed seems like the car shouldnt be driven anyway

robomatic12
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Car: 1990 300ZX TT

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Crazed.... we do this all day long in a real automotive shop by trained professionals. This is a common practice, try explaining to every customer they need new rotors when there old rotors were perfectly fine. Good luck with that.

As long as you do not bring the rotors down thinner than their factory spec it is fine, factory trained technicians turn rotors!!!

THAT BEING SAID:

Turning rotors off the car can induce more problems because the runout of the hub is not accounted for, and depending on how well the tech got the rotor balanced on the brake lathe you can get a good or not so good job.

Having the rotors turned on the car with a special type of on-car brake lathe is a much better option, I'm not sure how much more expensive this is becuase I have access to the tools myself but most good quality shops will have this machine.

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BigTDogg (MA)
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Location: Boston MA

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robomatic12 wrote:Having the rotors turned on the car with a special type of on-car brake lathe is a much better option, I'm not sure how much more expensive this is becuase I have access to the tools myself but most good quality shops will have this machine.
Precisely. This is the correct answer.

There is no REAL issue for a street driven car with respect to turning rotors, provided they will still meet the minimum thickness requirements cast into the rotor.

CrazedZ32Owner
Posts: 411
Joined: Fri May 28, 2010 11:59 am
Car: 91 Z32 TT(no motor), 2008 350Z Nismo, 05 Pontiac Sunfire speed machine!!! :)
Location: Lehigh Valley PA

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robomatic12 wrote:Crazed.... we do this all day long in a real automotive shop by trained professionals. This is a common practice, try explaining to every customer they need new rotors when there old rotors were perfectly fine. Good luck with that.

As long as you do not bring the rotors down thinner than their factory spec it is fine, factory trained technicians turn rotors!!!

THAT BEING SAID:

Turning rotors off the car can induce more problems because the runout of the hub is not accounted for, and depending on how well the tech got the rotor balanced on the brake lathe you can get a good or not so good job.

Having the rotors turned on the car with a special type of on-car brake lathe is a much better option, I'm not sure how much more expensive this is becuase I have access to the tools myself but most good quality shops will have this machine.
i stand corrected sir.... i just didnt see anyone explain it as you just did

zitupbaby
Posts: 45
Joined: Tue Mar 27, 2007 11:05 am
Car: 1993 nissan 300 zx, 91 nissan nx2000

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OK
Thanks for the input guys.

So if rotors are so cheap then show me a good pair of front ones for lets say $35 plus s&h

If they go for that which I doubt then sign me up, as long as shipping isn't $60.

The car is fine to drive for now in town. I should correct myself the tires on it are snow tires I just need to put the new summer tires on.

Anyone want snow tires?

Oshkosh, WI

N-

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es.biggs
Posts: 2120
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Car: 1990 300ZX 5sp NA
Location: Charlotte, NC

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robomatic12 wrote: Turning rotors off the car can induce more problems because the runout of the hub is not accounted for, and depending on how well the tech got the rotor balanced on the brake lathe you can get a good or not so good job.

Having the rotors turned on the car with a special type of on-car brake lathe is a much better option, I'm not sure how much more expensive this is becuase I have access to the tools myself but most good quality shops will have this machine.
Good points...the Firestone I used to work at used this machine - it's great. You will end up paying more for this method because A) it's a better service B) the shop will charge much more than $20 in labor and at that point they should just do the pads too, while they are in there.

If my rotors were warped, I would get new ones. Just as a personal preference for this car. As said above, there is nothing wrong with turning rotors when you can keep it in spec. But keep in mind - the more warpage, the more material needs to be taken off. And as with everything brake related, the more material the better.

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BigTDogg (MA)
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zitupbaby wrote:So if rotors are so cheap then show me a good pair of front ones for lets say $35 plus s&h

If they go for that which I doubt then sign me up, as long as shipping isn't $60.
http://www.rockauto.com/RSS/vehiclefeed ... &html=true

Closeouts on some Beck Arnley fronts. Raybestos are available for $28, just click on the "go to catalog" button. Nothing fancy but they'll do the job.

zitupbaby
Posts: 45
Joined: Tue Mar 27, 2007 11:05 am
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my car is not a turbo but thanks

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Ace2cool
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All TT and 91+ N/A Had the same size rotors/ calipers, 30mm. '90 N/A and ONLY the '90 N/A had 28mm.

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BigTDogg (MA)
Posts: 4194
Joined: Wed Aug 29, 2007 8:26 am
Car: 1990 Nissan 300ZX TT
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Ace2cool wrote:All TT and 91+ N/A Had the same size rotors/ calipers, 30mm. '90 N/A and ONLY the '90 N/A had 28mm.
This


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