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4

Though there are some very good answers here already, I get the impression you are more interested in why the brakes suddenly stopped working after you stopped riding for a moment. I am not a brakes expert, but I have a solid background in thermodynamics. From that perspective, it sounds like what happened (as explained above) is that you had boiling ...


4

Lets put some physics to play (mostly because I want to do some numbers....) Assume the brakes did all the work..... 200kg all up weight of rider, bike, trailer and kids. 350Meter vertical descent means you need to dissipate 700kJ of energy = 200WH. I found a reference to "Road and mountain brakes must absorb 75 watt-hours of energy over a 15-minute ...


15

What you experienced was brake fade. There are two reasons why it happens: The fluid inside the brake boils releasing gas into the system which makes the brakes feel spongy and then non-existant. The pad and rotor heat up sufficiently to not work, this feels like you are applying the brake but it doesn't work. You look to have experienced the first. ...


2

I suspect you overheated the caliper so it expanded a little causing a leak. The smell was either plastic parts of the caliper or brake fluid burning off. Once it cooled a little your pumping the lever cause the self-adjusting feature of the brake to adjust to the loss of fluid. That's what makes me think it was fluid loss rather than the caliper itself ...


0

Maybe you could just lift the thing up bodily in place of a stoker? Just bungee the rear wheel to the 2nd set of handlebars, then bungee the center of mass to the stoker seat? If it works you might find a way to make more convenient attachment, like standoffs (like the way the attach the space shuttle to a 747) to hold the kids bike horizontal above the ...



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