Bikeguide.org - Bike maintenance for BMX'ers
The Street => The Bike Shop => Topic started by: M@tty on August 10, 2016, 09:06:55 AM
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Just bought one of these brakes and although it works well I just have 1 problem. Unless I leave the bolts loose the brakes go to the rim and don't spring back. Is it supposed to be this way? I don't want them falling off randomly because I can't tighten the bolts...
Anyone else with this brake experience this problem?
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Doesn't sound right. I tighten mine down and they spring back. The arms have a little slop in them on the brake post even after adding a spacer. I'm thinking my bolt is a bit too long
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Maybe I'm just setting them up wrong but as soon as i go past a smidge of finger tight they just stay locked on.
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Check and make sure you dont have em upside down. The frames brake post should be taller than the brass bushing for exactly this reason.
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2nd'd on what badlight said.
Post up a picture of how you have them mounted.
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I use rubber bands to solve this problem.
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Sounds weird because the spring should actually pull the brake back from the rim. All the suggestions mentioned sofar sound good, another thing I thought of is maybe you can play around with the amount of spacers on the brakepads to dial in the (let's call it) resting position of the brake arms. Maybe try longer screws as well.
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as soon as i go past a smidge of finger tight they just stay locked on
a few possibilities
1. the brake posts on your bike frame may have rough surfaces. if you take the brake arms off, you can use a high grit (i.e. 800+) sandpaper to 'polish' the posts a bit. this is also a good time to put a small dab of grease into the brake post threads after sanding.
2. inside each brake arm, the area that contacts the top of the brake posts, would "grab" the brake post if you're missing teflon washers. i dont have those brakes so i don't know what they use in there, but you can try dropping one (or two) of those tiny, super thin white plastic washers into each arm before you put the brakearm onto the brakeposts, so that the washers act as a minimal friction surface.
3. by the same effect, try adding a teflon washer under the bolthead
4. one of the common workarounds is just to add a rubberband onto the spring to increase tension, so that the spring + rubberband combo has enough tension to overcome the friction and pull the brakepads away from the rim. This may not work for you, however, seeing that the arms already get locked when the bolts are finger tight.
The suggestions above are not mutually exclusive, and you can try them in combination. i hope this solves it.