Help with brakes!... (not symmetrical)

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craig9045
Posts: 3
Joined: Wed Nov 21, 2012 14:25 pm

Help with brakes!... (not symmetrical)

Postby craig9045 » Wed Nov 21, 2012 14:31 pm

Hi guys, im fairly new to cycling and very inexperienced when it comes to it going wrong!

Got a question you hopefully might be able to help me with, i was swapping my back brake pads to the front(long story) and after i put it back the front brake wasnt aligned straight. I've tried googling it and no matter what screws/bolts i tighten or loosen the pad touches one side and not on the other.

Because im clueless i don't know if its something simple or if someone who knows what their doing needs to have a look for themselves. I've put a few photo's the the break underneath anyways.

PLEASE HELP!

http://i49.tinypic.com/v8os5c.jpg
http://i45.tinypic.com/rli07p.jpg
http://i45.tinypic.com/34rjacz.jpg

Craig

Chunkers1980
Posts: 7909
Joined: Tue Feb 10, 2009 14:12 pm

Re: Help with brakes!... (not symmetrical)

Postby Chunkers1980 » Wed Nov 21, 2012 14:43 pm

reset the pistons.

craig9045
Posts: 3
Joined: Wed Nov 21, 2012 14:25 pm

Re: Help with brakes!... (not symmetrical)

Postby craig9045 » Wed Nov 21, 2012 14:45 pm

hi thanks for your rely, im looking u exactly how to do that at the moment.

I've noticed that its just one of the arm brackets (the one with the wire clamp) that doesnt seem to be moving when at all.

Chunkers1980
Posts: 7909
Joined: Tue Feb 10, 2009 14:12 pm

Re: Help with brakes!... (not symmetrical)

Postby Chunkers1980 » Wed Nov 21, 2012 14:47 pm

Whoops. You've not got hydros!!

You need to equalise the spring tension pulling each arm apart.

alfablue
Posts: 8468
Joined: Sun Jun 05, 2005 21:49 pm

Re: Help with brakes!... (not symmetrical)

Postby alfablue » Wed Nov 21, 2012 14:48 pm

Firstly, make sure your wheel is straight in the dropout (do up the quick release with the bike on its wheel, if you do it with the bike upside down it is easier to misalign).

Next, make sure each of the springs (long straight bit behind each caliper) is located behind the tab.

There is a small cross-head screw on the outside of each brake caliper, if you screw the left one in, it will pull the brake out to the left, screw the right one in and it moves to the right. Unscrew either and the opposite happens. Adjust till centred.

(also, there are concave / convex washers each side of the calliper on the brake pad fastening. Each side has a fat and a thin washer, make sure you have fat closest to wheel on both sides.

Sometimes, old / tired / poorly maintained brakes will not return too well.

Tuck the end of the cable behind the spring tab (or zip tie it there) as it will eventually snap / fray if left sticking out like that.

alfablue
Posts: 8468
Joined: Sun Jun 05, 2005 21:49 pm

Re: Help with brakes!... (not symmetrical)

Postby alfablue » Wed Nov 21, 2012 14:48 pm

Chunkers1980 wrote:reset the pistons.

he's got v brakes :roll: :wink:
Last edited by alfablue on Wed Nov 21, 2012 14:53 pm, edited 1 time in total.

alfablue
Posts: 8468
Joined: Sun Jun 05, 2005 21:49 pm

Re: Help with brakes!... (not symmetrical)

Postby alfablue » Wed Nov 21, 2012 14:50 pm

This shows you what I said in detail, with pictures:

http://www.parktool.com/blog/repair-hel ... brake-type

craig9045
Posts: 3
Joined: Wed Nov 21, 2012 14:25 pm

Re: Help with brakes!... (not symmetrical)

Postby craig9045 » Wed Nov 21, 2012 15:17 pm

Hi guys

After a bit of fiddling ive got the brakes so they look straight. Just having a smaller issue where the rear of the left pad is touching and the front of it isnt. Not sure if this is something that i have done, theres a picture link underneath

Thanks for all your help so far guys, really impressed at the speed of it!

http://i45.tinypic.com/20p4qd3.jpg

User avatar
zx6man
Posts: 1082
Joined: Wed Mar 21, 2012 13:00 pm

Re: Help with brakes!... (not symmetrical)

Postby zx6man » Wed Nov 21, 2012 15:22 pm

Tiny comment, think you need to replace the pads anyway,,,,,

alfablue
Posts: 8468
Joined: Sun Jun 05, 2005 21:49 pm

Re: Help with brakes!... (not symmetrical)

Postby alfablue » Wed Nov 21, 2012 15:31 pm

Looks to me like the concave convex washers are all in the wrong order. You need these to be right to set the pads at the right angle. (And yes, your pads are worn out to the point where you will start damaging your rims).

This is the order they go in
Image
Image

(you may need the thick concave washer on the inside of the brake arm if your pads are very worn).
Also, see this: http://en.wikibooks.org/wiki/Bicycles/M ... Rim_Brakes

alfablue
Posts: 8468
Joined: Sun Jun 05, 2005 21:49 pm

Re: Help with brakes!... (not symmetrical)

Postby alfablue » Wed Nov 21, 2012 15:38 pm

Shimano's instructions are quite good, clear pics:

http://techdocs.shimano.com/media/techd ... 604449.PDF


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