In article o.uk,
Dave Liquorice wrote:
On Sat, 08 Oct 2011 16:10:55 +0100, Dave Plowman (News) wrote:

If it were a hydraulic failure, the idea is one will work if the other
fails. Of course if one has already failed...

But you should get a brake failure warning light if one circuit has
gone. Of course that bulb could have blown... but the POST should
alert you to that. You won't have full braking capabilty with a
failed circuit either but how much less probably depends on how
"failed" the failed circuit is.

Earlier this year, I had a "brake failure" light come up - not all the time
which was a bit confusing. Eventually traced to two blown bulbs in the
'stop' lights.

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