After having a problem with my brakes sticking on last week and the RAC saying the problem was the little rubber sleeve that goes on the brake slider pin, he took it off so I could get home and I bought a new one off EBay. However it doesn’t seem to want to fit on properly as if it’s slightly too big. Has anybody else ever had a problem with this? Do you know where I could buy genuine ones from and not patent part? What job does this rubber actually do? Would it hurt to leave it off forever!