billynibbles wrote:The most common fault with potentially-disastrous implications is one we find on cheap unbranded V-Brakes - i.e the final swing link in which the cable nipple sits (don't know its real name) tends to spread, being soft alloy. It only takes one good emergency stop to pull the cable through completely, just when you needed it most.
If you really want to spend half the lesson sorting out bikes, there's nothing better than a BMX with a badly maintained 360-degree rotor-head - back brake in various states of disconnection and a front brake that Arnie Schwarzeneggar couldn't pull hard - gotta luv 'em (not)
Phrases to watch out for - "it must be OK, we only bought it yesterday", or "my dad checked it last night", no doubt spraying WD40 all over the rims in the process.
However, if they say 'my grandad checked it last night', that's usually alright!
That is all scarily accurate. Those stunt BMX set ups should be clearly labelled not for road use as they are so rarely in working order - and I did some GoRide coaching at a school which had it's own bikes 3/4s of which had the cable pulled through on the front brake exactly as you describe - you've then got the dilemma of do you squeeze it back with a pair of plyers or not.