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#1: what does 4mm life on rear brakes mean?

Posted on 2006-03-14 07:51:09 by makhan

2001 Accord LX, 13,000 miles. dealer says 7mm life on front brakes and
4mm life on rear brakes--actually it was on my service invoice--nobody
mentioned it to me. What does it mean? Do i need to change brake pads,
rotors?

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#2: Re: what does 4mm life on rear brakes mean?

Posted on 2006-03-14 14:26:30 by TNKEV

makhan wrote:
> 2001 Accord LX, 13,000 miles. dealer says 7mm life on front brakes
and
> 4mm life on rear brakes--actually it was on my service
invoice--nobody
> mentioned it to me. What does it mean? Do i need to change brake
pads,
> rotors?

That is a measurement of your brake pad thickness,recomended
replacement time is 3mm,if if you have 4mm of pad life left you have
7mm of pad. the rear pads wear at about half the rate of the front.

if you have 13k miles and you have 7mm left on the front you will
likely be replacing pads front and rear at about 25k.



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#3: Re: what does 4mm life on rear brakes mean?

Posted on 2006-03-14 16:51:36 by Elle

Makhan, as TNKEV said, this is a measure of how much life
you have left on your Accord's &quot;brake linings,&quot; where &quot;brake
linings&quot; refer to brake pads for the front brakes, and,
depending on the car, either brake pads or brake shoes on
the rear brakes. Rotors are not involved here at this point,
at least not as indicated on the invoice you have.

The minimum required thickness varies from one model to
another. For example, for the 1991 Civic, 3 mm minimum is
required for the front. For the 1995 Civic, only 1.5 mm is
required for the front.

It's not clear how your service people measured, so I won't
agree with all of TNKEV's post. The dealer might have meant
the pad thickness on the front was 7 mm, meaning, if the min
required is 3 mm, you have 4 mm to go.

To give further perspective: Your front brake pads probably
started with about 11 mm of pad. If your rear brakes use
shoes, the shoes probably started at about 8 mm thickness.
I'd guesstimate you're probably around the one-third to
halfway point in the life of these linings. To say more
exactly, I'd need to know the min thickness specs for your
Accord and the actual starting thicknesses, as well as
whether your car uses pads or shoes in the rear.

The better news is that brake pads that are very near the
end of their service life have a built-in &quot;alarm&quot; to tell
the car driver. There's a piece of metal on the pad that,
with enough wear, will start screeching against the rotor.
It's noisy enough to be annoying, but sounds early enough so
that it's still safe to drive the car another, say, 100
miles.

You may get around 25k miles of life, altogether, out of
your brake linings, the way you're going. That's a bit low,
but it's all relative. Brake lining wear depends on driving
habits. E.g. do you drive a lot of hills or in the city a
lot?

This a manual or auto transmission? If manual, do you brake
with the engine?

Having brake pads and brake shoes replaced is routine
maintenance on a car, to be performed around every 25k to
70k miles.

Use only genuine Honda brake pads and shoes. Using others
may get you more brake lining life, but will tend to shorten
rotor life. (OTOH others here feel that rotors are so cheap
it's not worth worrying about, etc.)

&quot;makhan&quot; &lt;<a href="mailto:tjksethi&#64;gmail.com" target="_blank">tjksethi&#64;gmail.com</a>&gt; wrote
&gt; 2001 Accord LX, 13,000 miles. dealer says 7mm life on
&gt; front brakes and
&gt; 4mm life on rear brakes--actually it was on my service
&gt; invoice--nobody
&gt; mentioned it to me. What does it mean? Do i need to change
&gt; brake pads,
&gt; rotors?

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#4: Re: what does 4mm life on rear brakes mean?

Posted on 2006-03-14 17:22:06 by alan

TNKEV wrote:

&gt;
&gt; if you have 13k miles and you have 7mm left on the front you will
&gt; likely be replacing pads front and rear at about 25k.
&gt;
Does this apply to people who use their left foot on the brake?

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#5: Re: what does 4mm life on rear brakes mean?

Posted on 2006-03-14 17:57:25 by TNKEV

Elle wrote:
&gt;
&gt; The better news is that brake pads that are very near the
&gt; end of their service life have a built-in &quot;alarm&quot; to tell
&gt; the car driver. There's a piece of metal on the pad that,
&gt; with enough wear, will start screeching against the rotor.
&gt; It's noisy enough to be annoying, but sounds early enough so
&gt; that it's still safe to drive the car another, say, 100
&gt; miles.

I avoid saying that because every brake lining manufacturer does not
use the squealers. I work at a Jeep dealer and I see vehicles all day
that have factory pads still on the vehicle that do not have a
squealer,and the next vehicle same year same model has them. a person
waiting for the squealer to tell them they need pads may end up buying
rotors when they start making noise because there is no pad left and
they are metal to metal.



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#6: Re: what does 4mm life on rear brakes mean?

Posted on 2006-03-14 17:59:53 by TNKEV

Alan wrote:
&gt; TNKEV wrote:
&gt;
&gt;&gt;
&gt;&gt; if you have 13k miles and you have 7mm left on the front you will
&gt;&gt; likely be replacing pads front and rear at about 25k.
&gt;&gt;
&gt; Does this apply to people who use their left foot on the brake?

&quot;likely&quot;
did you see the word &quot;likely&quot; in the part of my post you quoted?



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#7: Re: what does 4mm life on rear brakes mean?

Posted on 2006-03-14 18:05:43 by TNKEV

Elle wrote:
&gt;
&gt; It's not clear how your service people measured, so I won't
&gt; agree with all of TNKEV's post. The dealer might have meant
&gt; the pad thickness on the front was 7 mm, meaning, if the min
&gt; required is 3 mm, you have 4 mm to go.

as Makhan posted &quot;the dealer said I have 4mm of &quot;pad life&quot;,I work at
dealer and when a technician says &quot;pad life&quot; that means the thickness
of pad left before reaching minimum pad thickness. when a technician
says &quot;the pads are at 3mm&quot; that is a pad thickness measurement they
have 0 pad life left.


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#8: Re: what does 4mm life on rear brakes mean?

Posted on 2006-03-14 18:27:16 by Elle

&quot;TNKEV&quot; &lt;<a href="mailto:serviceadvisor&#64;ajeepdealer.invalid" target="_blank">serviceadvisor&#64;ajeepdealer.invalid</a>&gt; wrote
&gt; Elle wrote:
&gt;&gt;
&gt;&gt; It's not clear how your service people measured, so I
&gt;&gt; won't
&gt;&gt; agree with all of TNKEV's post. The dealer might have
&gt;&gt; meant
&gt;&gt; the pad thickness on the front was 7 mm, meaning, if the
&gt;&gt; min
&gt;&gt; required is 3 mm, you have 4 mm to go.
&gt;
&gt; as Makhan posted &quot;the dealer said I have 4mm of &quot;pad
&gt; life&quot;,I work at
&gt; dealer

You are quite possibly correct, just as my post about the
squealers is quite possibly correct, but I think the prudent
thing to do is get clarification from this particular shop.

I don't care where you work. Really.

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#9: Re: what does 4mm life on rear brakes mean?

Posted on 2006-03-14 19:54:10 by TNKEV

Elle wrote:

&gt; I don't care where you work. Really.

I was only attemting to show some credibility,that my statement is
based on daily observation.



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#10: Re: what does 4mm life on rear brakes mean?

Posted on 2006-03-14 20:29:03 by Elle

&quot;TNKEV&quot; &lt;<a href="mailto:serviceadvisor&#64;ajeepdealer.invalid" target="_blank">serviceadvisor&#64;ajeepdealer.invalid</a>&gt; wrote
&gt; Elle wrote:
&gt;
&gt;&gt; I don't care where you work. Really.
&gt;
&gt; I was only attemting to show some credibility,that my
&gt; statement is
&gt; based on daily observation.

I know what you were attempting to do. Your statement is
based on your place of work and not necessarily others.

The OP should get clarification, to be sure.

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#11: Re: what does 4mm life on rear brakes mean?

Posted on 2006-03-15 06:04:16 by SoCalMike

TNKEV wrote:
&gt; Elle wrote:
&gt;&gt; The better news is that brake pads that are very near the
&gt;&gt; end of their service life have a built-in &quot;alarm&quot; to tell
&gt;&gt; the car driver. There's a piece of metal on the pad that,
&gt;&gt; with enough wear, will start screeching against the rotor.
&gt;&gt; It's noisy enough to be annoying, but sounds early enough so
&gt;&gt; that it's still safe to drive the car another, say, 100
&gt;&gt; miles.
&gt;
&gt; I avoid saying that because every brake lining manufacturer does not
&gt; use the squealers. I work at a Jeep dealer and I see vehicles all day
&gt; that have factory pads still on the vehicle that do not have a
&gt; squealer,and the next vehicle same year same model has them. a person
&gt; waiting for the squealer to tell them they need pads may end up buying
&gt; rotors when they start making noise because there is no pad left and
&gt; they are metal to metal.

and sometimes the squealers break off. the brakes will gradually get
louder and louder.

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