BMW rear Brake Discs - How long did yours last?

Malt_Vinegar

Malt_Vinegar

Malt_Vinegar

Don
Joined
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Was planning to order rear pads for my E65 today, but then I got to thinking, I know it needs pads, but the car has only done 60k should I be considering doing the discs too.

Any way, went out to stick my specially lipped measuring calipers on to measure the discs, but I cannot get them onto the blinking discs to get a reading with the wheels on, the brake caliper, and the dust shield are in the way, and means I cannot get a reading!!

Its cold, and I don't want to take the wheel off to see if I can get better access, so put my mind at rest, how many miles were yours when they went below minimum?
 
kindai said:
MTFU and go take a reading?
Click to expand...

I would, but my brother has nicked my trolley jacks and axle stands :( Really don't want to have to use the OE jack thingy.

Original is 24mm, and 22.4 is min.

1 x BPS2812
PREMIUM BRAKE PAD SET (4)
£23.93

1 x BPW0222
7 SERIES WEAR SENSOR
1 PER AXLE FITTED
£7.73

BDS6647X
2 x BDS6647X
FREMAX C+ VENTED DISC (1)
- O/H = 74mm - (O/H 67mm = BDS6054)
(£31.07)£74.57

BPF1695
1 x BPF1695
PAD FITTING KIT AXLE SET
£8.95

£75 quid difference, should really just get my butt in gear. I'm not one to skimp, and it will take 15 mins to man up and get a reading!
 
Last edited:
Discs are cheap enough. I would just swap them out it makes sense at that mileage.
Plus the pads will wear nicely.
 
You don't need a measuring device to check disc thickness. Just feel the lip at the edge. you'll know when the disc needs changing if the lip is obvious without even having to touch the disc with a finger anyway.
 
mrk said:
You don't need a measuring device to check disc thickness. Just feel the lip at the edge. you'll know when the disc needs changing if the lip is obvious without even having to touch the disc with a finger anyway.
Click to expand...

I always like to know how far they are gone exactly for the following reasons:

1 - I can check wear rates between pad changes
2 - Different brands have different wear rates, do i don't like to assume :)
3 - Extra check for getting correct sized discs
4 - It justifies me owning a customised disk caliper tool
 
mrk said:
You don't need a measuring device to check disc thickness. Just feel the lip at the edge. you'll know when the disc needs changing if the lip is obvious without even having to touch the disc with a finger anyway.
Click to expand...

I can vouch that deciding to check this way straight after a spirited drive hurts a lot. :o
 
If you've gone through a set of BMW pads then officially the disks will be below the minimum thickness. Discs are sacrificial these days as the pads are more abrasive. You might want to look at what disks are fitted though as genuine BMW ones (on my F11 at least) have alloy hubs to reduce the rotational mass.
 
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