Brake rotors already grooving

Less than one month ago, I replaced pads and rotors on all
four wheels. I've noticed that the front rotors already have
lots of grooves. I was careful not letting the new pads get
dirt or grit on them when installing, and everything was nice
and clean, as far as I can tell.

These grooves are not deep or wide, but I would have thought those
rotors would still be pretty damn smooth at this point.
The brakes work nicely and quietly, but was just wondering if
this was normal as it's been a long time since I've put new
rotors on a car. THANKS.

--
Cliff

> Less than one month ago, I replaced pads and rotors on all
> four wheels. I've noticed that the front rotors already have
> lots of grooves. I was careful not letting the new pads get



Grooves would normally be an indication of some sort foreign contact

Possibly rivets - or possibly what your seeing is just normal wear and tear.


> dirt or grit on them when installing, and everything was nice
> and clean, as far as I can tell.



Did you happen to have the rotors cut or resurfaced? i.e. happens to be a
requirement when replacing a rotor!


> These grooves are not deep or wide, but I would have thought those
> rotors would still be pretty damn smooth at this point.



How do you know? Are you using a micrometer?



BBA

On Wed, 12 Jan 2005 12:18:28 -0800, "BBA"
> wrote:

>Did you happen to have the rotors cut or resurfaced? i.e. happens to be a
>requirement when replacing a rotor!

Foo!

Where did you get that nonsense!

On Wed, 12 Jan 2005 13:51:51 -0800, John Ings >
wrote:

>On Wed, 12 Jan 2005 12:18:28 -0800, "BBA"
> wrote:
>
>>Did you happen to have the rotors cut or resurfaced? i.e. happens to be a
>>requirement when replacing a rotor!
>
>Foo!
>
>Where did you get that nonsense!

The same place he gets all his other nonsense. bob's garage.

> The same place he gets all his other nonsense. bob's garage.

what am I missing? what is that supposed to mean?

BBA

On Wed, 12 Jan 2005 14:39:43 -0800, "BBA"
> wrote:

>> The same place he gets all his other nonsense. bob's garage.
>
>what am I missing? what is that supposed to mean?
>
>BBA
>

I have been under the impression that you can just put new rotors on
your vehicle without doing anything to them first?

You are saying they need to be resurfaced first? Please explain,
which is it.

Lg

> >Did you happen to have the rotors cut or resurfaced? i.e. happens to be a
> >requirement when replacing a rotor!
>
> Foo!

same to you pal!

> Where did you get that nonsense!

I don't know what where you come from! Here in the US most NITB rotors will
require a base cut before installation

bba

On Wed, 12 Jan 2005 14:37:12 -0800, "BBA"
> wrote:

>> >Did you happen to have the rotors cut or resurfaced? i.e. happens to be a
>> >requirement when replacing a rotor!
>>
>> Foo!
>
>same to you pal!
>
>> Where did you get that nonsense!
>
>I don't know what where you come from! Here in the US most NITB rotors will
>require a base cut before installation

To the dertiment of the customer's wallet and the benefit of the
mechanic's bottom line!

On Wed, 12 Jan 2005 15:22:02 -0800, John Ings >
wrote:

>On Wed, 12 Jan 2005 14:37:12 -0800, "BBA"
> wrote:
>
>>> >Did you happen to have the rotors cut or resurfaced? i.e. happens to be a
>>> >requirement when replacing a rotor!
>>>
>>> Foo!
>>
>>same to you pal!
>>
>>> Where did you get that nonsense!
>>
>>I don't know what where you come from! Here in the US most NITB rotors will
>>require a base cut before installation
>
>To the dertiment of the customer's wallet and the benefit of the
>mechanic's bottom line!

Brake rotors (and drums) all tend to warp as the casting ages.
They also get a lot of abuse in handling. The machining of hubs and
mounting surfaces may be true to the friction surfaces when they're
made at the factory, but after shipping, stocking, and even just
months on the shelf, it's a different story. Some are worse than
others, but they ALL need to be surfaced before installation. Anyone
with experience on a brake lathe is aware of this, as is anyone with
formal training in automotive technology.

BBA wrote:
> > >Did you happen to have the rotors cut or resurfaced? i.e. happens
to be a
> > >requirement when replacing a rotor!
> >
> > Foo!
>
> same to you pal!
>
> > Where did you get that nonsense!
>
> I don't know what where you come from! Here in the US most NITB
rotors will
> require a base cut before installation

What are NITB rotors? Who told you that new rotors needed a "base cut"
before installation? As with the others here, I've never heard of
such a thing.

--
Cliff