Can't get the front brakes on..

yeachan153

I had a crash a week or so ago, and the bike came down as well. So today I set about trying to repair the damage on the bicycle. I noticed the front brake unit (5600) would not screw back on - the screw attaching it to the frame goes in fully the correct length it should, so there isn't anything missing; there would not be anything missing as post-accident the brake was still attached to the bike. However, when I try to tighten the unit to the frame by using an allen key, the nut that attaches to the screw (of the brake) inserted into the bike just keeps turning, i.e. without fixing the brake unit to the bicycle. If anyone has any experience of this then please let me know - the screw itself doesn't look to be bent either.

pinno

Is the screw 'threaded'? Has the accident caused the shaft to 'float', i.e has it come loose from the caliper? Has the knock caused the retaining screw to be obfiscated by something in the aperture?

plowmar

What are the threads like both on the screw and internally on the bike, could be that when you had the crash the brake attachments were forced into the bike thereby distorting the threads and notnow giving the bolt anything to bite on and tighten.

Same thoughts pinarello001

farrina

pinarello001 wrote:

obfiscated

At times like this I feel very ignorant ... now where did I leave my dictionary.


Regards

Alan

desweller

Can you get the nut out of the counterbore in the fork? Should come out if you push a long screw or rod of the right diameter into the fork from the front. Removing it will allow you to:

Check that the nut thread has not been stripped (unlikely from the accident, but it might have been poorly fitted in the first place)
Check that the fork integrity is OK in the brake mounting point

The other thing to check is the mounting of the caliper onto the screw itself.