The rear drum brake on my 2012 three wheeler is binding slightly at two points possibly due to fractional ovality. This makes a lot of noise. I have checked by jacking the rear up that everything else is tight and this seems the only source of the noise. I cannot see any manual adjustment on the back of the drum or a hole to adjust internally. Am I correct in assuming that there is a cam and ratchet device inside the drum to take up wear and the only way it can be slackened off, is to take the whole thing apart and release the ratchet?
