front brake discs

[bob]

I run a Forester thats only done 20,000 miles in three years.
I was told by the service garage at 14000 that the front disc,s might need
skimming at next service(now).
This seems to me a bit much after just three years, as I am not a heavy
driver,and it is bound to be expensive.
Does anyone know what technical criteria they use to justify this?
The discs all look smooth with no pitting or grooving .
Thanks in anticipation
Bob

 

[Carl 1 Lucky Texan]

I run a Forester thats only done 20,000 miles in three years.
I was told by the service garage at 14000 that the front disc,s might need
skimming at next service(now).
This seems to me a bit much after just three years, as I am not a heavy
driver,and it is bound to be expensive.
Does anyone know what technical criteria they use to justify this?
The discs all look smooth with no pitting or grooving .
Thanks in anticipation
Bob

To me, they were just trying to 'up-sell' you.

Carl

 

[mulder]

I run a Forester thats only done 20,000 miles in three years.
I was told by the service garage at 14000 that the front disc,s might need
skimming at next service(now).
This seems to me a bit much after just three years, as I am not a heavy
driver,and it is bound to be expensive.
Does anyone know what technical criteria they use to justify this?
The discs all look smooth with no pitting or grooving .
Thanks in anticipation
Bob

If you are not feeling any pulsation in the brakes, the rotors are
probably ok. In general it's not a good idea to machine them
unnecessarily as they don't have much extra thickness on them to begin
with. Usually they can only be resurfaced once before falling below
the minimum allowable thickness (which is stamped on the hub portion
of the rotor).
However it is possible for rotors on a lightly used vehicle to
deteriorate more rapidly than those on a regularly driven one. As the
car sits, the rotors build up a layer of rust. On a daily driven car
any rust from a night out in the rain, etc. will be quickly swept away
after a short distance of driving, but on one that sits the rust will
build up and may eventually render the rotor worthless.
Ask the shop to show you exactly what is wrong with the rotors, and
don't just take their word for it.

 

[Edward Hayes]

I agree with the idea that if you feel no pulsing or steering wheel
shaking then the rotors are just fine.

 

[Tom Bavis]

I run a Forester thats only done 20,000 miles in three years.
I was told by the service garage at 14000 that the front disc,s might need
skimming at next service(now).
This seems to me a bit much after just three years, as I am not a heavy
driver,and it is bound to be expensive.
Does anyone know what technical criteria they use to justify this?
The discs all look smooth with no pitting or grooving .
Thanks in anticipation
Bob

I just did the brakes for the first time on my wife's Forester after 6
years / 72000 miles. REotors measured about .005" less than "new".
There WAS a little rust buld-up at the edges of the friction area.

 

[Edward Hayes]

Rotor edge rust outside the pad area is of no consequence nor is
slight grooving IMO. If the car has no shimmy/pulsing during braking
I'd leave the brakes alone assuming the pad thickness is good.