There are wear indicators in the OEM pads to show the minimum thickness. Described in owners manual
Sent from my Nexus 7 using Tapatalk
Sent from my Nexus 7 using Tapatalk
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature currently requires accessing the site using the built-in Safari browser.
Today, I'm taking it out for its first 100-mile plus ride. If all goes well, I may do the rears this week.
The basics have been covered, but I would add just one thing. Before pushing the pistons back into the caliper, clean the exposed portion of the pistons to avoid damaging the O-rings that keep the brake fluid inside the caliper. A tooth brush and some Simple Green works great for this. If you really want to do a perfect job of cleaning the pistons (I always do) then stick a piece of wood that's at least as thick as the brake rotor and the backing plate of both pads between the pistons and apply that brake. This forces the pistons out a little further for a really good cleaning.
You asked about how the pads retract and don't drag on the rotor? Keeping the seals clean is part of that action. When you apply the brakes, the pressurized brake fluid forces the piston out to put force on the pads and in the process the O-ring rolls a little. Once you release the brake pressure, the O-ring will want to roll back and this will retract the pad just a hair. Also, no rotor tracks 100% true and so that variation can also help push the pad back just a hair. If your pistons and O-rings are dirty and in poor shape, then the piston could resist retraction and then you have dragging pads which heat up the rotor and wear out quickly or enevenly. Taken to an extreme, dragging pads can heat up the brake fluid to the point where you lose brakes (and this would happen even quicker if you have old fluid with moisture in it inside your brake lines).
Thanks everyone for this detailed thread. ... It's been helpful with my first attempt at changing the front pads... A few questions though.
1) the original pad (that didn't rest on the piston) has a perforated metal and plastic liner on its back. Did you unclipped this and reuse it?
Yes that clip actually prevents this brake squeal.Thanks. I've replaced the pads but am getting a buzzing sound when I start to apply the brake. I'm wondering if it is the "clip" that I don't seem to have.
See post 62. I tried to insert the picture here.. but no luck.
Don't mean to change your topic strat but where did you get your service manual?
Was this standard on the bike and something I've lost? I don't see it in the maintenance manual. Do you think I will be able to get it from the dealer?
Thanks again for all of your time and help...
...Am thinking of removing mine for a good cleaning....