what does this note mean

i did today service b for my honda civic 2001 sedan, manual
transmission. the dealer wrote the following in the note ""all tires
7.5mm front pads 7mm (aftermrkt) rear shoes 4mm" what does that mean
please? what does "aftermrkt" means (that how the spell it)?

thanks a lot.

 

Just a SWAG (Scientific, Wild-Assed Guess)but I think it means that your
tires (all of them)have approximately 7.5 mm of remaining tread. Your
front brake pads, not Honda OEM, have 7mm of wear left and, last but not
least, you have 4mm remaining wear on the rear shoes.

Aftermkt = After market parts which means nothing other than the parts
are not made by Honda or labeled as such by one of their suppliers.

 

thanks a lot for your reply. i understand it now. do you think i
should change them soon or how long i can wait before replace them?
thanks a lot. they also recomend me to do the time build thing. should
i do it or wait? my car is 125km and it civic 2001. thanks

 

They used to give this info in a more useful manner, such as 55% remaining,
etc. Simply giving you a number for the brakes or tires without also giving
you the appropriate service limits is pretty useless.

7.5mm on the tires is practically new. As far as the brake numbers, you
should ask them point blank what the service limits are so you can make an
intelligent decision. I suspect there is no hurry there either.

As far as the timing belt (build?), if the belt has never been changed, it
is about due based on age. You didn't list your mileage, but 2001 Hondas
generally specified the belt change interval at 7 years or 105,000 miles.

 

If the pads when new were,say 10mm,and he knows at what mileage they were
installed,he could figure his remaining life of the pads.

7/new pad thickness in mm(X) = miles driven on those pads/N miles total.
Solve for N.

N= (X) times miles driven/7

then subtract miles driven,and you've got remaining miles,approximately,for
his driving style.

--
Jim Yanik
jyanik
at
localnet
dot com

 

He could, assuming there was any knowledge of how thick they were when new.
Other than measuring it myself, I've never seen that number anywhere either,
except in the serviceability specs (that are not in the owner's manual).

 

Well,he could measure some new pads.
(the lining thickness...to state the obvious)

Maybe find a sympathetic parts clerk that would allow him to measure a new
set.[without having to actually buy them.... ;-) ]

I would not use it as an absolute standard,but as a guideline or ballpark
type of measurement.

Of course,that -assumes- even pad wear for inner and outer pads....

It would be an interesting experiment.

--
Jim Yanik
jyanik
at
localnet
dot com

 

in principle, you're right, but the math you show doesn't factor unless
the 7mm is pad material only, and not the pad /and/ backing plate [which
is what most shops measure]. and even then, you still shouldn't run it
down to zero. total thickness minus backing plate minus "safe residual"
is all you have to work with - "wearable" thickness. 7mm total with
backing plate is probably not a lot of wearable pad left.

 

it's not logical to measure the backing plate WRT pad wear.

then the OP's "7 mm remaining" is EXTREMELY thin and dangerous,and the
mechanic should have recommended pad replacement.

the backing plate alone is probably 7mm,or close to it.

Yes,after figuring remaining mileage for total pad thickness remaining,you
should subtract the minimum pad thickness(in miles) to determine how much
usable mileage you have remaining.

That minimum pad thickness is a safety reserve,to keep you from grinding
the rotor with the backing plate,and causing a greater repair expense.

--
Jim Yanik
jyanik
at
localnet
dot com

 

indeed, but it's the simplest measurement to make.

6.1mm on a set of new oem honda. total thickness 17.0mm. with a 1.9mm*
"reserve", that's 9.0mm "wearable" from new.

* - a "round" guesstimated number.

 

Thanks,this is good to know.
Heh,I was pretty close on my guesstimate of 10mm for a new pad.
and that from memory!

So,the OP's mechanic would have been "remiss" in not recommending new pads
with his "7mm" measurement,as that would only leave 0.9mm "reserve" before
the operator gouges his rotors.(if he included the backing plate in it)

But 7mm of a 9mm pad would not even be worth mentioning to the
customer IMO,plenty of pad life left.

The two Haynes manuals(yes,but that's all I have...) I checked cited a
1/16"(.0625) reserve pad thickness,that works out to 1.6mm,so you would
have 9.3mm usable pad thickness. However,in calculating "mileage per
mm",all you need is original pad thickness and how much was left after the
miles you drove,to get the amount of pad used per miles driven.
What's left only matters in how close you want to gamble before installing
new pads.

Some people might choose to set a larger "reserve",in case uneven wear
occurs due to a stuck caliper or other problem. That happened on my last
brake job,I only had maybe 1mm left on the outside pad,and inside pad had
hardly any wear.I had stuck caliper pins(Sentra) and had to buy a new
bracket and pin kits,couldn't free one pin from the bracket.


It's important to note (for the lurkers)that this calc only fits an
individual driver and car,as people differ in their driving habits and use
of their brakes.
Some people like to ride their brakes,too... ;-(


--
Jim Yanik
jyanik
at
localnet
dot com

 

just looked in the service manuals i have - it's inconsistent. the 89
civic has a service limit of 3.0mm, the 2000 civic has 1.6mm. given
that modern brake pad materials are better than 20 years ago, i think
you can safely choose your own poison anywhere between these two.