Hi, I'm new to this workd, got myselt a used bike but the rear break arm keeps rubbing on the tire, no idea how to fix this
The first pic is just the resting position, the second is when i squeeze the breaks
by TinyFishEnjoyer
Hi, I'm new to this workd, got myselt a used bike but the rear break arm keeps rubbing on the tire, no idea how to fix this
The first pic is just the resting position, the second is when i squeeze the breaks
by TinyFishEnjoyer
8 Comments
Looks like the spring on the backside, for centering, is missing.
There are springs under the bolt that connects the calipers to the frame. Either the springs are broken misaligned, or significantly weaker on the right side than left.
The left brake pad is properly adjusted, while the right is not, it appears to be missing the rim entirely. You should be able to loosen the nut that sits on the brake arm and move the brake pad into position. The pad can sometimes shift a bit when you tighten the nut up, so it might take a second try to get it right.
First.
The wheel is not in the middle of the frame. Sort that out and then do brake caliper spring alignment.
Wheel isn’t centered…fix that first. Do a search on ‘wheel dishing’.
You need to adjust the brake position so that the brake pad extrudes further from the brake lever.
Start this video at 5:40
https://www.parktool.com/en-us/blog/repair-help/cantilever-smooth-post-brake-service
You will also need to adjust the cable tension, and the tension for each arm.
Check this video for that
https://youtu.be/XMa9UqY9obk?si=h7xFHtnwqB1B84rO
First off, the wheel isn’t centered in the frame – you need to get that sorted first. Then you want to extend the brake pads on their stems so the brake arms are clearing the tyre. Finally sort out the tension by adjusting the springs. Chances are you’ll need to lubricate or replace the brake cable too.
You’ve got a couple of things going on there. First your wheel is not centered in the frame – look at how close it is to the left seat stay as opposed to the right. Hopefully it’s not wheel dish causing this. Fix that first.
Then, adjust the brake springs either through preload adjustment screws (I didn’t see any in your pictures), or by significantly loosening the bolt on which they pivot, and inserting the pin (at the end of the spring) into one of the three holes in the frame. (The holes closer to the wheel axle make the brake arm have more spring/sit further away from the wheel, while the holes closer to the seat do the opposite).