snailracer
Über Member
If so, you should be able to see a mark on the tyre sidewall.
Brake locks front wheel resulting in flying over the handlebars
- Thread starter Freddy92
- Start date
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lulubel
Über Member
- Location
- Malaga, Spain
A thought has just popped into my head - you say the bike originally had a 'centre pull' brake, (by which I assume you mean a cantilever), which has been replaced by a V brake:
Was the brake lever replaced at the same time? When V brakes were introduced I seem to remember dire warnings about using them with levers designed for cantis.
This was my first thought too. Cantis replaced with Vs, and the levers not replaced.
Maybe that's what happened?
No, it can happen if the pad is marginally too low. Apply brake, pad dives under rim. Release brake, pad can't fly back, wheel is jammed. This happened to one of the riders on the FNRTTC, just after the tea stop. It was the rear wheel, so no acrobatics were involved. A couple of minutes with an allen key and all was well.
Actually thinking about what you guys said about changing from a V brake to a side pull and not changing the lever. You are right - the pull on the brake cable per mm is going to move the pads in towards the rim more in the V brake than the cantilever. (I had no idea until now there was more than one type of brake lever.)
Smokin Joe
Legendary Member
- Location
- Bare headed cyclist, Smoker
I'd run the front brake from the left lever, much smoother curve of the cable.
Linford
Guest
Not much wrong with that IMO . If you drop the cable off you can see if it is stiff in action in the sheath, and also you can move the levers on the fork legs to make sure they aren't partially seized.
Smokin Joe
Legendary Member
- Location
- Bare headed cyclist, Smoker
oldroadman
Veteran
- Location
- Ubique
Brake hard enough on any decent set up and it's possible to lock up. If the wheel would not move then investigation, not speculation, is needed to se why. Whilst respecting the "professional engineer" quote, it shows a lack of understanding of braking systems if anyone believes that brakes cannot be locked up - one reason for ABS on motor vehicles. All that said, do hope the lady is OK.
simon.r
Person
- Location
- Nottingham
+1
Ideally it looks as if the outer could do with being a liitle bit shorter, but it's OK as it is.
rualexander
Legendary Member
The tops of the brake arms look to be rather far apart with a lot of bare cable between the rubber boot an the cable anchor bolt, maybe the washers on the pads need to be swapped around so that the narrow washer is on the inside which will bring the arms closer together. For a better cable run to the noodle pipe you can get a noodle with a tighter angle.
mickeydrippin60
Veteran
- Location
- bolton
i work in a bike shop i am also an engineer ( HNC in mechanical engineering ) and tbh ime sick of hearing the old am an engineer so i know about bike's malarkey it dont mean anything you can either set up a bike or you cant simple as that if you dont want your daughter to be able to lock up her front wheel simply get her one of these http://www.ebay.co.uk/itm/Tektro-V-...keparts_SR&hash=item2ebc1d0722#ht_1999wt_1270 it should help. if that sounded abit ranty ime sorry just tired
Sheffield_Tiger
Guru
My theory is that I firstly wouldn't want to arm-wrestle your daughter! 
Just kidding, but it sounds like she has a, shall we say, firm grip, managing to bust a front canti. My reckoning is, the brakes being harsher than she is used to, the front wheel locked under emergency braking with the added leverage of the original brake lever - maybe with a small rut or similar to help it lock up.
The fall somehow managed to dislodge the return spring out of one arm, leaving no opposing force to balance the brake leaving one arm tight to the rim.
The "quick job" done to sort it was releasing the noodle, popping the return spring back in place and re-inserting the noodle into the stirrup
Just kidding, but it sounds like she has a, shall we say, firm grip, managing to bust a front canti. My reckoning is, the brakes being harsher than she is used to, the front wheel locked under emergency braking with the added leverage of the original brake lever - maybe with a small rut or similar to help it lock up.
The fall somehow managed to dislodge the return spring out of one arm, leaving no opposing force to balance the brake leaving one arm tight to the rim.
The "quick job" done to sort it was releasing the noodle, popping the return spring back in place and re-inserting the noodle into the stirrup
