10-11-2017, 12:59 PM
Brake grab is often the result of contamination on the friction surfaces - as Robert suggests, give them a good clean up using some brake cleaner spray. It sounds counter-intuitive, but oil on linings can cause this. Otherwise something loose or sticking, either within the brake itself, or externally (as Ruairidh suggests). The shoes must move freely and smoothly, and return firmly when released.