> .... you got scammed big time. My, admittedly old, '89 300e 'never' has had
> new rotors installed and it's going on 250k km. pads cost me around CDN 50
> front and rear and it takes me 1/2 hr tops to change them.....
>
> cheers, guenter
>> .... you got scammed big time. My, admittedly old, '89 300e 'never' has had
>> new rotors installed and it's going on 250k km. pads cost me around CDN 50
[quoted text clipped - 5 lines]
>$46 rear, I would agree. Plus, in normal use, on any decent car, the
>rotors should still be fine at 25K miles.
Usually, yeah. But there is one failure mode that can warp rotors to the
point of needing repalcement and that is using the brakes to slow descent down
a BIG hill them coming to a stop at the bottom of it waiting at a light. The
rotors experrience differential cooling and can warp in short order.
Of course not changing the pads when you're supposed to trashes them pretty quickly
too but that's what the wear sensors are for.

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Richard Sexton | Mercedes stuff: http://mbz.org
1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
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James O'Riley - 19 Aug 2006 16:28 GMT
>>> .... you got scammed big time. My, admittedly old, '89 300e 'never' has had
>>> new rotors installed and it's going on 250k km. pads cost me around CDN 50
[quoted text clipped - 10 lines]
> a BIG hill them coming to a stop at the bottom of it waiting at a light. The
> rotors experrience differential cooling and can warp in short order.
That's precisely why I shift to a lower gear on a descent. Been doing that
since I was a kid with a '36 Ford.
> Of course not changing the pads when you're supposed to trashes them pretty quickly
> too but that's what the wear sensors are for.
Dori A Schmetterling - 20 Aug 2006 01:06 GMT
I thought current thinking was that it is cheaper to wear out brake pads
than engines/gear boxes. (Though, I suppose, one might have to watch brake
fade on long descents.)
DAS
For direct contact replace nospam with schmetterling
---
[...]
> That's precisely why I shift to a lower gear on a descent. Been doing
> that since I was a kid with a '36 Ford.
[...]
Richard Sexton - 20 Aug 2006 01:15 GMT
>I thought current thinking was that it is cheaper to wear out brake pads
>than engines/gear boxes. (Though, I suppose, one might have to watch brake
>fade on long descents.)
Yeah so don't so it all the time. The guy I know that told me this lives
way way up top of a steep hill with a stop sign at the bottom. He wore out
lots of rotors before figuring this out (he has about 4 cars) and gets
better than average life out of his trannies.
Do it all the time when you decelerate and it might be a problem as it's
the shifting not the deceleration that causes wear, but occasionally and
only on drastic hills with a stop sign at the bottom and you shouldn't have
a problem.

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Need Mercedes parts? http://parts.mbz.org
Richard Sexton | Mercedes stuff: http://mbz.org
1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
633CSi 250SE/C 300SD | http://aquaria.net http://killi.net