Maintenance Tool
How to maintenance disc brakes on the bicycle?
How to check if the pads are worn out. And what tools I would need to use. I have mechanical Shimano BR-M475 disc brakes. Thank you!
You are asking how to do this on here so please do not start taking the calipers off of the bike. The easiest way to check your pads for wear(even this is still a faff) is to turn the bike upside down, remove the wheel by undoing the quick release(front one first, easy peasy) then where the disc goes through the caliper you can see the pad and it’s backing. When they are out they look like this http://www.chainreactioncycles.com/Models.aspx?ModelID=710
When the pad is nearly worn out the middle portion will be just under 1mm thick.
To change the pads the wheels need to be off. Take out the silver split pin and just pop the pads out. Watch how the spring is fitted between the pads as the new ones need to go back in the same way. Refit pads and spring, push the split pin back through making sure it’s through the hole in the pads and open it up at the end. When you buy new pads, try and get the “sintered” ones. They have tiny bits of metal through the pad and are much harder wearing than “resin” ones which are prone to wearing out within a ride or two in the muddy UK.
As the pads wear out there are allen key adjusters on the calipers themselves which have arrows to show you which way to turn them to take up the slack. Turn them by an 1/8th of a turn each time and then spin the wheel to make sure it’s not jamming the brakes shut, if the disc is rubbing undo the pads a click with the allen key untill they are just missing the disc or you can use the barrel adjuster on the brake lever to loosen them off too. A little “zing” here and there as the wheel spins is allowed.
It looks a right nightmare but when you are doing it you will see it’s pretty easy.
Best of luck.
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