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Old 22-06-2008   #1
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mountain bike brake discs

i have just got a mountain bike with discs on both wheels the bike is a kona kikapu 1 of the pads on both discs are against the discs while the other one isnt when i press the brake leavers the disc slightly bends dose this mean i need new brake pads???
ive never had a bike with discs before in the past ive only hd v brakes
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Old 22-06-2008   #2
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Re: mountain bike brake discs

Sounds like the brakes need adjusting so the pads both touch the disc when the lever is pressed.
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Old 22-06-2008   #3
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Re: mountain bike brake discs

yes, pads/calliper/wheel are not alligned. the easiest way is to adjust the wheel position. if it still does it, then get out the allen keys
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Old 22-06-2008   #4
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Re: mountain bike brake discs

If you get a long handled alan key, usually about a 4/5 size, loosen the pads of on both sides. Use one hand to squeeze the brake leaver, and with the other tighten the pads until you feel a little resistance.

When you look at the disc and pads from the front of the bike the one on the left should be almost touching the disc (to a point where at first it may rub ever so slightly). the other pad moves in and out with the leaver you want it set back just a little further away than the left one.

Hope that helps

Hay x

edit: just make sure that the wheel is in straight first! I find it helps to drop it in (its a kona so im assuming that it is going to have a quick release) when the bike is upside down as gravity holds it in place better
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Old 22-06-2008   #5
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Re: mountain bike brake discs

Quote Originally Posted by Lupi View Post
If you get a long handled alan key, usually about a 4/5 size, loosen the pads of on both sides. Use one hand to squeeze the brake leaver, and with the other tighten the pads until you feel a little resistance.

When you look at the disc and pads from the front of the bike the one on the left should be almost touching the disc (to a point where at first it may rub ever so slightly). the other pad moves in and out with the leaver you want it set back just a little further away than the left one.

Hope that helps

Hay x

edit: just make sure that the wheel is in straight first! I find it helps to drop it in (its a kona so im assuming that it is going to have a quick release) when the bike is upside down as gravity holds it in place better
thanx all for the advice had a bit of a play its better now when i get paid im going to get new disks cables pads
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Old 22-06-2008   #6
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Re: mountain bike brake discs

Quote Originally Posted by drunknspike View Post
thanx all for the advice had a bit of a play its better now when i get paid im going to get new disks cables pads
Your welcome, halfords was useful for something then lol
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Old 22-06-2008   #7
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Re: mountain bike brake discs

What brakes are on it Hayes mechanical??


Lupi that method is ok on some Hydro brakes but if you have a lazy piston it will foce it off center and damage the caliper..

The Hayes mechanical have a static inboard pad...

Spike let us know what brakes they are (post a couple of pictures if you can't ID it..)
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Old 22-06-2008   #8
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Re: mountain bike brake discs

My playbike runs original HOPE hydraulics....When they were all aluminium and hand-made....

They are like bike jewellery....Motorcycle levers....Alloy adjusters on the top of the cylinders for on-the-fly pressure adjustment....
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Old 22-06-2008   #9
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Re: mountain bike brake discs

they are mechanical
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Old 22-06-2008   #10
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Re: mountain bike brake discs

Quote Originally Posted by ThisBitterPill View Post
My playbike runs original HOPE hydraulics....When they were all aluminium and hand-made....

They are like bike jewellery....Motorcycle levers....Alloy adjusters on the top of the cylinders for on-the-fly pressure adjustment....

Which boil and lock on when you really use them

had to bin mine had a rear hub collapse on me and had no other option but to ride back to the car managed to rub off the anodizing leading to oxidization and the pistons sticking got fed up of freeing them off

would like these (i have the older black and gold M4mono.)

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Old 22-06-2008   #11
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Re: mountain bike brake discs

Spike they are shimano Cable...

First off where did you get the bike from? the cable length after the pinch bolt is downright dangerous (it can flap into the disc and fire you over the bars)

Also the metal plates between the bolts and rotors want bending tight to the head of the bolts (the Konas rear disc is usually factory fitted where as the front one is fitted by the shop to prevent it been bent in transit) to prevent the rotor bolts working loose......

If you first remove the pads and visually align the caliper so the disc sits centered in the caliper (both top and bottom)...

next remove the wheel and refit the pads...

on the inboard static pad there is a 5mm alan key hole on the back of the caliper this is used to wind the pad in or out you want it so its just touching the disc (ever so slightly)

next use the cable adjuster on the lever to fetch the outboard pad close to the disc..

and thats all there really is to it
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Old 22-06-2008   #12
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Re: mountain bike brake discs

Spike have a look at this it shows an avid cable brake which is similar to your shimano ones the only real difference is the avid has a dial to adjust pad contact..
http://www.parktool.com/repair/readhowto.asp?id=124
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Old 23-06-2008   #13
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Re: mountain bike brake discs

Quote Originally Posted by Andy Monty View Post
had to bin mine had a rear hub collapse on me and had no other option but to ride back to the car managed to rub off the anodizing leading to oxidization and the pistons sticking got fed up of freeing them off(i have the older black and gold M4mono.)
Ouch!....Never had any trouble with mine boiling up I must admit....Then again I don't ride that many big descents....Never had any trouble with their hubs either....Big 'uns F & R....
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Old 23-06-2008   #14
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Re: mountain bike brake discs

Quote Originally Posted by ThisBitterPill View Post
Ouch!....Never had any trouble with mine boiling up I must admit....Then again I don't ride that many big descents....Never had any trouble with their hubs either....Big 'uns F & R....
no these where a set of shimano hubs that collapsed have had one set of old XC's about 4 years (on the rear wheel) got the matching front one when the other shimano hub died.. and both are still running as smooth as the day it arrived from Chain reaction..

as for boiling my mate suffered with his C2's in North yorkshire then again i have had the m4's smoking in the dales a combination of lots of Pies and long Down Hill runs do tend to do that
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Old 23-06-2008   #15
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Re: mountain bike brake discs

ewww cable operated disc brakes

they always used to be crap, have they generally got better or have Kona gone downhill (and i don't mean downhilling with the Stinky!)
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