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BMW condition based monitoring.

 
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ade and liz flint
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PostPosted: Wed Aug 22, 2018 6:29 pm    Post subject: BMW condition based monitoring. Reply with quote

I always knew this system was half useful ( service, inspection) and half useless (brake wear). Just to prove a point, #127 was showing 1300miles until rear pad exchange required. I'd had a quick peek at the pads as best as possible as previous owner didn't want to hand over with an impending bill for me. My limited visual showed they looked ok, so I said leave them and I'll sort as I like them done properly, not by service monkeys on time limits.

So, #127 is on stands whilst I get the rear wheels refurbed and new ps2's fitted, so I stripped the pads out and measured them: 7mm of friction material depth remaining, from original 10mm, so around half worn assuming 3-4mm as minimum thickness. If I wasn't so anal I'd just stick them back in for another 20k, but at 30 for a set of pads I'll exchange and forget for longer as discs are barely marked and will see at least this next set of pads out.

Pics of removed pads after a clean and measure; obviously in need of imminent change (according to BMW CBM):



Don't believe what you see. This is just a crappy algorithm working solely in BMW service favour. If told the brakes are cooked, ask to see them prior to paying a fortune for monkeys to uneccesarily replace them and empty your wallet
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ali
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Joined: 10 Feb 2007
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PostPosted: Wed Aug 22, 2018 7:15 pm    Post subject: Reply with quote

Thats good advice.
I've just sold my E91 LCI 330D and the OBC was showing 2100 miles to new front pads.
Popped the front wheel off and pads look grand enough just like yours do so they are getting left on
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octanejunkie
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PostPosted: Wed Aug 22, 2018 11:21 pm    Post subject: Reply with quote

I never trust that system. It was designed for fleet cars. Not really suitable for high performance metal that needs special care.
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AidanB10
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PostPosted: Thu Aug 23, 2018 12:16 am    Post subject: Reply with quote

I see it alot, always advise "It MAY require a set of pads, but we'll check while on the ramp"

However in most cases theyre maybe 60% worn or so

BUT we're not allowed to do a CBS correction anymore, as it'll confuse the computer and over estimate the life of the pads...
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ade and liz flint
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PostPosted: Thu Aug 23, 2018 12:45 pm    Post subject: Reply with quote

AidanB10 wrote:
I see it alot, always advise "It MAY require a set of pads, but we'll check while on the ramp"

However in most cases theyre maybe 60% worn or so

BUT we're not allowed to do a CBS correction anymore, as it'll confuse the computer and over estimate the life of the pads...


I feel for you guys at the desk-front here: It's a shame a partial reset can't be done to accommodate incorrectly estimated worn sets as a lot of good stuff gets scrapped for no good reason. I'll keep the old pads in my 'used but good' store in case an emergency, which at the moment I can't imagine, may occur.
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