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  #1 (permalink)  
Old 13 Mar 2008, 09:15 pm
Dave L
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Default From "AOL Auto Questions"


I ran into this today and thought a couple parts of this article were
interesting, particularly the differences between different octane gas and
whether to let the car warm up before driving. The top section about
squeeking brakes - almost sounds like they're promoting re-surfacing the
roters for each brake job to keep them from squeaking. I've changed brakes
before withought re-surfacing and never had a problem. Opinions?

http://tinyurl.com/34du4y

-Dave



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  #2 (permalink)  
Old 13 Mar 2008, 10:06 pm
Ph@Boy
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Posts: n/a
Default Re: From "AOL Auto Questions"

Dave L wrote:
> I ran into this today and thought a couple parts of this article were
> interesting, particularly the differences between different octane gas and
> whether to let the car warm up before driving. The top section about
> squeeking brakes - almost sounds like they're promoting re-surfacing the
> roters for each brake job to keep them from squeaking. I've changed brakes
> before withought re-surfacing and never had a problem. Opinions?
>
> http://tinyurl.com/34du4y
>
> -Dave
>
>
>

I read the article and thought it was general at best. A lot lacking,
and a bit off mis information concerning the topic of hydroplaning.

Yes, you can get away with not resurfacing rotors, but it's not the
preferred or recommended manner normally to do a brake job.

If you have a heavily grooved rotor you will notice that the worn pad to
be replaced has the exact matching grooves in it.

The new replacement has of course has a flat surface that will have to
wear in to the rotor to obtain the greatest breaking surface. That can
take time and braking performance in a panic situation can suffer.

Resurfacing also removes any warp.

I could go on, but I'm sure others will have many other reasons as well.

Resurfacing rotors is a good thing.

OBTW, the biggest factors for hydroplaning are speed of the vehicle and
tire pressure. Tread and water depth make little if any difference.
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  #3 (permalink)  
Old 13 Mar 2008, 10:07 pm
EdV
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Posts: n/a
Default Re: From "AOL Auto Questions"

On Mar 13, 10:15*pm, "Dave L" <davelieuREMOV...@yahoo.com> wrote:
> I ran into this today and thought a couple parts of this article were
> interesting, particularly the differences between different octane gas and
> whether to let the car warm up before driving. *The top section about
> squeeking brakes - almost sounds like they're promoting re-surfacing the
> roters for each brake job to keep them from squeaking. *I've changed brakes
> before withought re-surfacing and never had a problem. *Opinions?
>
> http://tinyurl.com/34du4y
>
> -Dave


I had my RAV4's rotors resurfaced only after changing the pads and the
squeeling didn't disappear. After resurfacing it was totally gone. I
guess my opinion would only to resurface if you are having problems,
otherwise don't waste your money fopr the resurface
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  #4 (permalink)  
Old 14 Mar 2008, 10:11 am
Tegger
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Posts: n/a
Default Re: From "AOL Auto Questions"

"Ph@Boy" <user@example.net> wrote in
news:IcOdncGlE_5vdkTanZ2dnUVZ_jydnZ2d@trueband.net :

> Dave L wrote:
>> I ran into this today and thought a couple parts of this article were
>> interesting, particularly the differences between different octane
>> gas and whether to let the car warm up before driving. The top
>> section about squeeking brakes - almost sounds like they're promoting
>> re-surfacing the roters for each brake job to keep them from
>> squeaking. I've changed brakes before withought re-surfacing and
>> never had a problem. Opinions?
>>
>> http://tinyurl.com/34du4y
>>
>> -Dave
>>
>>
>>

> I read the article and thought it was general at best. A lot lacking,
> and a bit off mis information concerning the topic of hydroplaning.
>
> Yes, you can get away with not resurfacing rotors, but it's not the
> preferred or recommended manner normally to do a brake job.
>
> If you have a heavily grooved rotor you will notice that the worn pad
> to be replaced has the exact matching grooves in it.
>
> The new replacement has of course has a flat surface that will have to
> wear in to the rotor to obtain the greatest breaking surface. That can
> take time and braking performance in a panic situation can suffer.
>
> Resurfacing also removes any warp.




My objection to resurfacing is that many garages do not seem to care for
their brake lathing equipment properly.

A dull or mispositioned bit will make an absolutely horrible "new" surface
on the rotors. Such a surface can glaze up in a big hurry.

If you are guaranteed a quality lathe job, go for it. But if there is /any/
suspicion of lathe quality, either replace the rotors or just put the new
pads on the old surface (provided your new pads are the same as the old
ones).


--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/
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  #5 (permalink)  
Old 14 Mar 2008, 10:26 am
Ph@Boy
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Posts: n/a
Default Re: From "AOL Auto Questions"

Tegger wrote:
> "Ph@Boy" <user@example.net> wrote in
> news:IcOdncGlE_5vdkTanZ2dnUVZ_jydnZ2d@trueband.net :
>
>> Dave L wrote:
>>> I ran into this today and thought a couple parts of this article were
>>> interesting, particularly the differences between different octane
>>> gas and whether to let the car warm up before driving. The top
>>> section about squeeking brakes - almost sounds like they're promoting
>>> re-surfacing the roters for each brake job to keep them from
>>> squeaking. I've changed brakes before withought re-surfacing and
>>> never had a problem. Opinions?
>>>
>>> http://tinyurl.com/34du4y
>>>
>>> -Dave
>>>
>>>
>>>

>> I read the article and thought it was general at best. A lot lacking,
>> and a bit off mis information concerning the topic of hydroplaning.
>>
>> Yes, you can get away with not resurfacing rotors, but it's not the
>> preferred or recommended manner normally to do a brake job.
>>
>> If you have a heavily grooved rotor you will notice that the worn pad
>> to be replaced has the exact matching grooves in it.
>>
>> The new replacement has of course has a flat surface that will have to
>> wear in to the rotor to obtain the greatest breaking surface. That can
>> take time and braking performance in a panic situation can suffer.
>>
>> Resurfacing also removes any warp.

>
>
>
> My objection to resurfacing is that many garages do not seem to care for
> their brake lathing equipment properly.
>
> A dull or mispositioned bit will make an absolutely horrible "new" surface
> on the rotors. Such a surface can glaze up in a big hurry.
>
> If you are guaranteed a quality lathe job, go for it. But if there is /any/
> suspicion of lathe quality, either replace the rotors or just put the new
> pads on the old surface (provided your new pads are the same as the old
> ones).
>
>

You're absolutely right Tegger. Some guys haven't changed a seven dollar
insert in years if ever!

Setup by a knowledgeable operator is key as well.

It really a disservice to a customer when you just hog off all the iron
on the thinest rotor or largest diameter drum and not take into account
the others and just turn them down to the same dimension. Most don't
demand it, but on some high end vehicles this must be done and the
customer should be informed.

Some guys just want to sell rotors, or how many jobs can I get through
this machine to pay for it and the mechanic, not build a new customer to
be a return.
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  #6 (permalink)  
Old 14 Mar 2008, 11:18 pm
Dave L
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Posts: n/a
Default Re: From "AOL Auto Questions"


"Ph@Boy" <user@example.net> wrote in message
news:IcOdncGlE_5vdkTanZ2dnUVZ_jydnZ2d@trueband.net ...
> Dave L wrote:
>> I ran into this today and thought a couple parts of this article were
>> interesting, particularly the differences between different octane gas
>> and whether to let the car warm up before driving. The top section about
>> squeeking brakes - almost sounds like they're promoting re-surfacing the
>> roters for each brake job to keep them from squeaking. I've changed
>> brakes before withought re-surfacing and never had a problem. Opinions?
>>
>> http://tinyurl.com/34du4y
>>
>> -Dave
>>
>>
>>

> I read the article and thought it was general at best. A lot lacking, and
> a bit off mis information concerning the topic of hydroplaning.
>
> Yes, you can get away with not resurfacing rotors, but it's not the
> preferred or recommended manner normally to do a brake job.
>
> If you have a heavily grooved rotor you will notice that the worn pad to
> be replaced has the exact matching grooves in it.
>
> The new replacement has of course has a flat surface that will have to
> wear in to the rotor to obtain the greatest breaking surface. That can
> take time and braking performance in a panic situation can suffer.
>
> Resurfacing also removes any warp.
>
> I could go on, but I'm sure others will have many other reasons as well.
>
> Resurfacing rotors is a good thing.
>
> OBTW, the biggest factors for hydroplaning are speed of the vehicle and
> tire pressure. Tread and water depth make little if any difference.


It was general but I think that's what they were trying to do to simplify
each situation. The topics that caught my eye were the ones I see being
debated on these groups from time to time. The use/reasons for the
different octane fuel, whether it's good to really warm up a car and whether
rotors should be re-surfaced.

I know re-surfacing removes any warp but if the brakes are replaced before
any pulsating starts I thought having the rotors turned wouldn't be
necessary... Besides, wouldn't re-surfacing increase the tendency for it to
warp again?

I agree speed and tire pressure affect hydroplaning - but so do the tread
pattern/compound. I used to have the Bridgestone Potenza RE-960 on a
Prelude and they were the best tires I've ever used on wet roads. Almost
felt like I was driving on dry pavement and cannot remember ever
hydroplaning, whether it was light or heavy rain. Very stable and solid.
Snow was a different story - they were awful! It was a trade-off. However
nothing beats common sense!

-Dave


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  #7 (permalink)  
Old 14 Mar 2008, 11:20 pm
Dave L
Guest
 
Posts: n/a
Default Re: From "AOL Auto Questions"


"Tegger" <tegger@tegger.c0m> wrote in message
news:Xns9A6171FA1F584tegger@207.14.116.130...
> "Ph@Boy" <user@example.net> wrote in
> news:IcOdncGlE_5vdkTanZ2dnUVZ_jydnZ2d@trueband.net :
>
>> Dave L wrote:
>>> I ran into this today and thought a couple parts of this article were
>>> interesting, particularly the differences between different octane
>>> gas and whether to let the car warm up before driving. The top
>>> section about squeeking brakes - almost sounds like they're promoting
>>> re-surfacing the roters for each brake job to keep them from
>>> squeaking. I've changed brakes before withought re-surfacing and
>>> never had a problem. Opinions?
>>>
>>> http://tinyurl.com/34du4y
>>>
>>> -Dave
>>>
>>>
>>>

>> I read the article and thought it was general at best. A lot lacking,
>> and a bit off mis information concerning the topic of hydroplaning.
>>
>> Yes, you can get away with not resurfacing rotors, but it's not the
>> preferred or recommended manner normally to do a brake job.
>>
>> If you have a heavily grooved rotor you will notice that the worn pad
>> to be replaced has the exact matching grooves in it.
>>
>> The new replacement has of course has a flat surface that will have to
>> wear in to the rotor to obtain the greatest breaking surface. That can
>> take time and braking performance in a panic situation can suffer.
>>
>> Resurfacing also removes any warp.

>
>
>
> My objection to resurfacing is that many garages do not seem to care for
> their brake lathing equipment properly.
>
> A dull or mispositioned bit will make an absolutely horrible "new" surface
> on the rotors. Such a surface can glaze up in a big hurry.
>
> If you are guaranteed a quality lathe job, go for it. But if there is
> /any/
> suspicion of lathe quality, either replace the rotors or just put the new
> pads on the old surface (provided your new pads are the same as the old
> ones).
>
>
> --
> Tegger
>
> The Unofficial Honda/Acura FAQ
> www.tegger.com/hondafaq/


I never considered the equipment used to resurface the rotors. Good point!

-Dave


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  #8 (permalink)  
Old 14 Mar 2008, 11:21 pm
Dave L
Guest
 
Posts: n/a
Default Re: From "AOL Auto Questions"


"EdV" <systmengr@hotmail.com> wrote in message
news:efe7d405-bd97-46b3-8e01-5a9c1e088a76@59g2000hsb.googlegroups.com...
On Mar 13, 10:15 pm, "Dave L" <davelieuREMOV...@yahoo.com> wrote:
> I ran into this today and thought a couple parts of this article were
> interesting, particularly the differences between different octane gas and
> whether to let the car warm up before driving. The top section about
> squeeking brakes - almost sounds like they're promoting re-surfacing the
> roters for each brake job to keep them from squeaking. I've changed brakes
> before withought re-surfacing and never had a problem. Opinions?
>
> http://tinyurl.com/34du4y
>
> -Dave


I had my RAV4's rotors resurfaced only after changing the pads and the
squeeling didn't disappear. After resurfacing it was totally gone. I
guess my opinion would only to resurface if you are having problems,
otherwise don't waste your money fopr the resurface



Exactly how I feel, unless something convinces me otherwise!

-Dave


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  #9 (permalink)  
Old 17 Mar 2008, 06:25 pm
C. E. White
Guest
 
Posts: n/a
Default Re: From "AOL Auto Questions"


"Ph@Boy" <user@example.net> wrote in message
news:IcOdncGlE_5vdkTanZ2dnUVZ_jydnZ2d@trueband.net ...

> I could go on, but I'm sure others will have many other reasons as well.
>
> Resurfacing rotors is a good thing.


I beg to differ. I can't speak for Toyota, but I know Ford and GM
specifically says resurfacing is not required when replacing pads unless the
rotor is damaged. And then only minor damage can be cleaned up. Significant
groving requires rotor replacement. Futhermore, Ford only recommend
resurfacing rotors on the car. Unless the brake lathe is in great condition,
the chances of it making things worse are significant. Unless the car
already has warped or otherwise damaged rotors, I see no reason to routinely
turn brake rotors. I know most independent shops routinely turn brake
rotors. They usually give a couple of reasons, but in many cases the main
reason is extra profit or just habit.

See:
http://www.encyclopedia.com/doc/1G1-92137449.html
http://www.aa1car.com/library/2003/bf110322.htm
http://www.stoptech.com/tech_info/wp...rakedisk.shtml

> OBTW, the biggest factors for hydroplaning are speed of the vehicle and
> tire pressure. Tread and water depth make little if any difference.


Oh boy.......you really need to clarify this. See
http://www.nhtsa.dot.gov/cars/rules/...8/part5.6.html .
You statement is misleading at best. Speed is a major factor for sure. But
tread depth is not the trival factor that you impy in your statement. Tire
inflation pressure is a major factor once "water depth exceeds the
capability of the tread design to remove water." So for minimal depth of
water and good condition tread, tire inflation pressure is not a bigger
factor that depth of water and tread. Furthermore the formula used is pretty
lame since it does not account for sidewall stiffness. Try applying the
forumla to a run flat tire with all the pressure released and get back to
me.

See also:

http://www.tirerack.com/tires/tirete...e.jsp?techid=3


Ed


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  #10 (permalink)  
Old 18 Mar 2008, 10:11 pm
Ph@Boy
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Posts: n/a
Default Re: From "AOL Auto Questions"

C. E. White wrote:
> "Ph@Boy" <user@example.net> wrote in message
> news:IcOdncGlE_5vdkTanZ2dnUVZ_jydnZ2d@trueband.net ...
>
>> I could go on, but I'm sure others will have many other reasons as well.
>>
>> Resurfacing rotors is a good thing.

>
> I beg to differ. I can't speak for Toyota, but I know Ford and GM
> specifically says resurfacing is not required when replacing pads unless the
> rotor is damaged. And then only minor damage can be cleaned up. Significant
> groving requires rotor replacement. Futhermore, Ford only recommend
> resurfacing rotors on the car. Unless the brake lathe is in great condition,
> the chances of it making things worse are significant. Unless the car
> already has warped or otherwise damaged rotors, I see no reason to routinely
> turn brake rotors. I know most independent shops routinely turn brake
> rotors. They usually give a couple of reasons, but in many cases the main
> reason is extra profit or just habit.


I've noticed the auto manufacturers are in that same extra profit and
habit mode as well on every new one pumped out.

All I can say Ed, is never do yours. Most people come into a shop with
the pad backing plate, if not a piston ground into at least one of the
rotors, wondering what is that funny noise and the vibration in the
brake pedal?
>
> See:
> http://www.encyclopedia.com/doc/1G1-92137449.html
> http://www.aa1car.com/library/2003/bf110322.htm
> http://www.stoptech.com/tech_info/wp...rakedisk.shtml
>
>> OBTW, the biggest factors for hydroplaning are speed of the vehicle and
>> tire pressure. Tread and water depth make little if any difference.

>
> Oh boy.......you really need to clarify this. See
> http://www.nhtsa.dot.gov/cars/rules/...8/part5.6.html .
> You statement is misleading at best. Speed is a major factor for sure. But
> tread depth is not the trival factor that you impy in your statement. Tire
> inflation pressure is a major factor once "water depth exceeds the
> capability of the tread design to remove water." So for minimal depth of
> water and good condition tread, tire inflation pressure is not a bigger
> factor that depth of water and tread. Furthermore the formula used is pretty
> lame since it does not account for sidewall stiffness. Try applying the
> forumla to a run flat tire with all the pressure released and get back to
> me.
>
> See also:
>
> http://www.tirerack.com/tires/tirete...e.jsp?techid=3
>
>
> Ed
>
>

8.7 times the square root of the tire pressure is the formula to
calculate hydroplane speed in general. It's pretty reliable unless you
need to go into some physics calculations.

Tire tread depths vary greatly. Most folks don't buy specialty tires.
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