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Car Forum / BMW Cars / January 2008330ci : Brake disc needs replacement after 10,000 km ?!
Hi Folks, a BMT 330ci is in the workshop - they called and want to replace the brake discs after less than 10000km. It is about 18 months old. The car has been used occasionally within the city for short rides. Waiting for days for the next usage, it is clear that the discs start to corrode after some days. But can this mean that you have to replace them that early ?! I guess this is not a BMW-specific topic - except if they used the wrong material... Any technical hints are welcome - thanks in advance! Klaus. > Hi Folks, > a BMT 330ci is in the workshop - they called and want to replace the > brake discs after less than 10000km. It is about 18 months old. > The car has been used occasionally within the city for short rides. > Waiting for days for the next usage, it is clear that the discs start > to corrode after some days. But can this mean that you have to replace > them that early ?! No. Any corrosion like this is simply rubbed off when you use the brakes. > I guess this is not a BMW-specific topic - except if they used the > wrong material... > Any technical hints are welcome - thanks in advance! It's I'd say near unique that the discs need changing at such a low mileage. 30-40,000 miles is more like it. Usually at the second pad change. The minimum thickness is stamped on the disc hub. Might be worth getting an independent expert to measure them if you can't do this yourself.  Signature*The longest recorded flightof a chicken is thirteen seconds * Dave Plowman dave@davenoise.co.uk London SW To e-mail, change noise into sound. On Jan 15, 1:15 pm, "Dave Plowman (News)" <d...@davenoise.co.uk> wrote: > In article <a8apo31j9iftsbo7m46en15o96honbj...@4ax.com>, > [quoted text clipped - 17 lines] > getting an independent expert to measure them if you can't do this > yourself. I've done about 15k on mine and they're getting towards needing replacement but that is over about 3 or four years. Possibly they're worn enough that they're suggesting that you might want to replace them while they have it instead of the "inconvenience" of takign it back in a year's time. No. Depends how excessive it is. Overnight rust, OK, but this is not always the case. Even with left foot braking on a dual carriageway, if they are that badly corroded, replacement is the only way to overcome it. You'll also find the pads have worn funny too. > No. Any corrosion like this is simply rubbed off when you use the brakes. > a BMT 330ci is in the workshop - they called and want to replace the > brake discs after less than 10000km. It is about 18 months old. > > The car has been used occasionally within the city for short rides. Unless someone drove it really hard (brake hard) or took it to the track, it seems very strange that the discs would need replacing already. I have a 530i which is probably somewhat heavier than your 330ci, and I got new discs after 44k miles (5 years). They were still usable though, but the would not last through another set of pads, so I went ahead and got them done at that point. Like others suggested, go to another shop for a second opinion or have the disc thickness measured. > Waiting for days for the next usage, it is clear that the discs start > to corrode after some days. But can this mean that you have to replace > them that early ?! You'll see little surface rust as quickly as an hour after you wash the car. That is not a reason to replace the discs. That's normal and will go away as soon as you apply brakes. Pete It sounds like they want to replace them because they are corroded. Not because they are worn, cracked, etc. So, do you experience brake judder, any abnormal braking, etc? If not, I would personally leave them on there. > Hi Folks, > [quoted text clipped - 11 lines] > Any technical hints are welcome - thanks in advance! > Klaus. > Hi Folks, > [quoted text clipped - 11 lines] > Any technical hints are welcome - thanks in advance! > Klaus. Just say NO. You'd have to live on top of a mountain to wear the brakes out in this mileage. Perhaps they could explain further why they feel the discs need replacing. Light surface corrosion does not accelerate disc wear. > Hi Folks, > [quoted text clipped - 11 lines] > Any technical hints are welcome - thanks in advance! > Klaus. From the gist of the posts, sound like you are located in the UK. I recall from my tour of duty in the East Anglia area in the 80s that things corroded quite quickly because of the salt on the roads and the wet climate. Here in the US in the southeast where the climate is mild brakes last a very long time -- 50-70k miles before new pads and frequently the rotors are still OK. Unless you can hose the undercarriage of the car off frequently, or drive more often, I am afraid you are going to be stuck with more brake problems over the life of the car. > From the gist of the posts, sound like you are located in the UK. I > recall from my tour of duty in the East Anglia area in the 80s that [quoted text clipped - 5 lines] > afraid you are going to be stuck with more brake problems over the life > of the car. I'm originally from the NE coast of Scotland where besides the salt from the sea we get vast amounts used on the roads in the winter - far more so than the relatively mild East Anglia. And it makes little if any difference to the life of discs. Other metal parts like brake pipes etc it will do. 50k pad life suggests *very* gentle use. I consider 25k good - and I'm not a hard driver, although do now live in an area with heavy traffic. BTW the OP is unlikely to be from the UK - he mentions kilometres. ;-) Signature*A chicken crossing the road is poultry in motion.* Dave Plowman dave@davenoise.co.uk London SW To e-mail, change noise into sound. >> From the gist of the posts, sound like you are located in the UK. I >> recall from my tour of duty in the East Anglia area in the 80s that [quoted text clipped - 11 lines] > difference to the life of discs. Other metal parts like brake pipes etc it > will do. Interesting! My forebearers were originally from somewhere south of Glasgow -- came to the U.S. around 1830 or so. Still have school books from that era -- Mitcalder Academy or some such. Indeed the driving we do around here does not task brakes much at all. I run around 60 miles per day round trip to work mostly on 4 - 6 lane highways running around 80 mph. Town driving is no where near what I recollect London was -- or for that matter Tokyo where I spent a couple years. My wife's Honda Pilot is still on the original brakes at 70k miles. > 50k pad life suggests *very* gentle use. I consider 25k good - and I'm not > a hard driver, although do now live in an area with heavy traffic. > BTW the OP is unlikely to be from the UK - he mentions kilometres. ;-)
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