TomZ
Member
In 90K miles on two STs (a 2012 and a 2015) I've gone through 4 sets of EBC HH rear pads and 2 rotors. Rear brakes seem to wear quickly for me on the ST, but the fronts have never worn out. With the HH sintered pads, the rotors show grooving and develop a wear lip after just a few K miles. Unlike the fronts, the rear caliper on the ST does not completely relax with the brakes not applied, and the pads drag a little. This seems worse with the HH pads because the sintered pad material is fairly porous and tends to pull out in spots, leaving abrasive material between the pads and rotor. To reduce the drag, I occasionally take off the caliper, clean it and re-lube the guides and piston.
Both rotor replacements resulted from wearing completely through a brake pad without realizing it and damaging the rotor. Fortunately the OEM rotors are not very expensive and are easy to replace. When I first rode the Tenere I used the rear brake excessively and also experimented with trail braking. Now I use mostly engine braking.
The latest failure occurred after riding steep unpaved roads where I was using the rear brake a lot. As the attached pictures show, the right-side pad has been bent by the piston and almost completely worn through. Most of the left pad is still intact but lot of the sintered material has fallen out. The stainless steel brake piston was also discolored by heating and the outer seal on the caliper was badly deteriorated. Also, the right side of the rotor was glazed and heavily scored. I'm not sure how all this happened, but possibly dirt jammed the caliper guides and prevented the right side pad from sliding.
I installed new OEM caliper seals with the grease that came with them, new piston, guides and heat shields. The rotor still useable and cleaned up with wet-or-dry sandpaper. I also installed OEM brake pads and intend to do so in future because I don't like the way the HH sintered pads lose material. With the OEM pads, the rotor wear is now smooth as it should be.
Both rotor replacements resulted from wearing completely through a brake pad without realizing it and damaging the rotor. Fortunately the OEM rotors are not very expensive and are easy to replace. When I first rode the Tenere I used the rear brake excessively and also experimented with trail braking. Now I use mostly engine braking.
The latest failure occurred after riding steep unpaved roads where I was using the rear brake a lot. As the attached pictures show, the right-side pad has been bent by the piston and almost completely worn through. Most of the left pad is still intact but lot of the sintered material has fallen out. The stainless steel brake piston was also discolored by heating and the outer seal on the caliper was badly deteriorated. Also, the right side of the rotor was glazed and heavily scored. I'm not sure how all this happened, but possibly dirt jammed the caliper guides and prevented the right side pad from sliding.
I installed new OEM caliper seals with the grease that came with them, new piston, guides and heat shields. The rotor still useable and cleaned up with wet-or-dry sandpaper. I also installed OEM brake pads and intend to do so in future because I don't like the way the HH sintered pads lose material. With the OEM pads, the rotor wear is now smooth as it should be.
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