Issue with brakes

loudymacloud

Morning Folks,

Having an issue with my rear brakes, standard Shimano Sora i think.

Anyway problem i am having is the brakes not releasing after I apply them.

Pull the brakes, calipers move as expected and brake pads make contact with the rim. No issues there
But when i release the brakes the calipers don't move back out and the pads stick to the rim.

Any ideas what i did to cause that.

Cheers.

seamus

Couple of possibilities:

1. The pads are slightly off the rim, then a little lip get worn into the pad over time. When you pull the caliper hard, this lip gets caught under the edge of the rim and holds on.

2. The caliper is flithy. Happens on rear brakes that they just get gunged up with crap from the wheel. They need to be stripped down, cleaned up and regreased.

3. Your brake cable is corroded/dirty. If it's not been replaced in a while, the cable can get caught in the inner and prevent the caliper from snapping back.

Use your hand to close the caliper and see how it responds. If it doesn't snap back, but gets stuck or comes back slowly, then you probably have scenario 2. If it does snap back, then hold the caliper closed and pull the brake lever. It should be loose and floppy: If you feel resistance you have scenario 3.

loudymacloud

seamus wrote: »

Couple of possibilities:

1. The pads are slightly off the rim, then a little lip get worn into the pad over time. When you pull the caliper hard, this lip gets caught under the edge of the rim and holds on.

2. The caliper is flithy. Happens on rear brakes that they just get gunged up with crap from the wheel. They need to be stripped down, cleaned up and regreased.

3. Your brake cable is corroded/dirty. If it's not been replaced in a while, the cable can get caught in the inner and prevent the caliper from snapping back.

Use your hand to close the caliper and see how it responds. If it doesn't snap back, but gets stuck or comes back slowly, then you probably have scenario 2. If it does snap back, then hold the caliper closed and pull the brake lever. It should be loose and floppy: If you feel resistance you have scenario 3.

Cheers Seamus

Thinking its scenario 2

Joe1919

seamus wrote: »

Couple of possibilities:

1. The pads are slightly off the rim, then a little lip get worn into the pad over time. When you pull the caliper hard, this lip gets caught under the edge of the rim and holds on.

I do cut off the lip with a sharp blade (e.g Stanley knife) where this happens and re-adjust the block up a little higher.

cdaly_

seamus wrote: »

Couple of possibilities:

2. The caliper is flithy. Happens on rear brakes that they just get gunged up with crap from the wheel. They need to be stripped down, cleaned up and regreased.

You should be able to wash it in place. Start with hot water - pour it over while working the caliper. Continue with WD40 or equivalent to remove the water. Finally oil all of the pivot points.

Take care not to get oil or WD40 on pads or rims.

loudymacloud

got it sorted, was indeed a build up of crap on the calipers.