Rear brake pump failure

BLUEJAY

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Hi gents,
while I was driving down the Splugen pass yesterday at a quite high pace, my rear brake started to fail on me. :spitfire
Luckily, that did not happen all of a sudden but with a "decent" warning time.
At the end, the pedal would go loose all the way down with no braking at all. :eek:

Stopped and checked: if working the pedal a few times, I could see some small bubbles coming out from the bottom half of the brake pump although no oil was leeking - oil reservoir still at level.
After a while the brake seemed to have regained its power (tried just a few times).
Went along with the ride (much more carefully) trying to avoid using the rear brake.
In my opinion, I believe the failure was a combination of heavy breaking + high temperature in the pump - some o-rings need replacement?

Any experience or opinion to be reported would be greatly appreciated.

Cheers
:beerjug:
 
Can also be air in the brake system. I think you can get a rebuild kit from BMW for the seals.
 


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