C70 brakes question

  • Thread starter Thread starter A Thomas
  • Start date Start date
A

A Thomas

I was told by my local Volvo dealer that for a 1999 C70 brake job, that
you cannot turn the rotors because they were designed to a minimum
thickness from the manufacturer. I have never heard of this before and
thought that you can get about 2 turns from a rotor. So if that's the
case and you have some warped rotors then you would have to buy new
rotors. This is insane.

Anyone know anything about this?

Thanks
Andy
99 C70 HT
 
It's not "insane", it's the way it is......

Best way to prevent warped rotors is to buy cross-drilled slotted
rotors.....they don't warp.....

FER

| I was told by my local Volvo dealer that for a 1999 C70 brake job, that
| you cannot turn the rotors because they were designed to a minimum
| thickness from the manufacturer. I have never heard of this before and
| thought that you can get about 2 turns from a rotor. So if that's the
| case and you have some warped rotors then you would have to buy new
| rotors. This is insane.
|
| Anyone know anything about this?
|
| Thanks
| Andy
| 99 C70 HT
|
|
|
|
|
|
 
Andy - I have been a mechanic for 30 years professionally, and it used
to be that brake rotors had enough metal on them to take some turning
and still be useable. But times have changed and brake parts are thinner
and lighter,cars are fast and economical, and we expect them to stop
shorter than ever, and brakes do need to be replaced more. You should
enjoy the great engineering of today's machines.
Last week I got caught in a 70 MPH panic stop on a big freeway in my
'87 740, and I thought I would rear-end the car in front for sure. I
think I missed him by 2 inches, but I'm very happy none the less. I feel
pretty secure in it.
It's been my experience that a lot of rotor warping was induced by
uneven torquing of wheel nuts, so if you take your car to a shop, and it
comes out with lumpy brake action, have that checked out.
If you don't have faith in your dealer mechanics, find a good
independant shop. There's plenty of them too.
Good luck, Richard W.
 
In an earlier contribution to this discussion,
A Thomas said:
I was told by my local Volvo dealer that for a 1999 C70 brake job,
that you cannot turn the rotors because they were designed to a
minimum thickness from the manufacturer. I have never heard of this
before and thought that you can get about 2 turns from a rotor. So
if that's the case and you have some warped rotors then you would
have to buy new rotors. This is insane.

Anyone know anything about this?

Thanks
Andy
99 C70 HT
Click to expand...


The front disc (rotor) thickness is 26mm when new. The minimum permissible
thickness is 23mm. That provides *some* scope for skimming - but not a lot
if they are already worn.
 
R Weinberger said:
It's been my experience that a lot of rotor warping was induced by
uneven torquing of wheel nuts, so if you take your car to a shop, and it
comes out with lumpy brake action, have that checked out.
Click to expand...

I agree with this.

Something else I like to do- when stopping at a traffic light, I like to
roll forward after a couple seconds. This way, the pads aren't clamping
down on the same part of the brake rotor the whole time, and trapping heat
there. It probably doesn't matter unless the brakes are really hot, but a
good habit nonetheless.

Another thing to avoid- driving through deep puddles with hot brakes. Not
sure if this is an old wives' tale, but also a good habit.

Best of all- pay attention to traffic and let off the gas pedal a bit
earlier. Sometimes you can't avoid a panic stop, but you can avoid a lot of
brake-gas-brake-gas-brake-gas :)
 
I've never had to cut a rotor but I do have them reground or sanded at each
pad change. New rotors are not usually needed and just a way for shops to
pick up some easy bucks. Of course if you insist on getting the last 5000
miles out of your pads then you must pay the piper. eddie
 
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