Today I was at 1600m in the Rif Mountains, 35km from the nearest tarmac road and on a long downhill section when all of a sudden my back brake stopped working. I got off and scratched my head (that's about the limit of my technical skills). Couldn't see anything obvious, my pads were OK, the calipers were floating OK, there was fluid in the little reservoir thingy.

So I started off rather gingerly using engine braking and front brake only which was rather disconcerting. Then all of a sudden the brake started working again. An hour or so later it happened again. This time I noticed the fluid in the reservoir was quite high, and when I pumped the brake pedal it gradually fell back to a normal position. And then the brakes worked OK again.

Could it be old brake fluid or an air lock or something that is affected when the brakes are really working hard?

I had the bike serviced just before leaving but I don't have much confidence in the dealership, they failed to notice my clutch cable was almost frayed through (despite replacing the clutch at the time). And there was nothing on the bill for brake fluid despite asking for a full service.

All suggestions welcomed.
Tim

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"For sheer delight there is nothing like altitude; it gives one the thrill of adventure
and enlarges the world in which you live," Irving Mather (1892-1966)

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