Rear brake service on the B12 was done as part of the brake overhaul. As is typical with these machines, the pistons start sticking as soon as the brake dust builds up, and my pistons were no exception. So, before installing the new brake lines, I took the rear caliper apart, cleaned everything, and replaced the seals.
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| To split the caliper, remove the two Allen bolts holding the two halves together. But first, remove your pads by taking out cotter pins and sliding the slider pins out. These are often stuck and may need a little encouragement. It is a good idea to grease these pins with some brake grease before reassembly. I used graphite, but the copper grease also works well. |
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| The two halves apart. On the right, you should see a small o-ring between the matting surfaces. I reused mine, but it is available as part of brake kits. See how dirty the pistons are. |
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| Seals out, piston out, and partially cleaned. |
After all arts were clean and smooth, I installed new seals, lubed them with brake fluid, and pushed the clean pistons back in. The two halves were bolted together reusing the stock bolts, and then I installed brake pads and grease slider pins.
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