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New to CB400 four and new here! Front brake improvement?
Oddjob:
There is also a strong spring on the adjusting bolt to make sure the fixed pad moves away from the disc when the pressure is released.
I am however in disagreement with Bryan regarding cleaning the slot for the seal, a Dremel is ideal for this job, it's what you put on the end of it that matters. The abrasive discs I use will remove alloy, the crud that collects in the slot is hard but it's no match for the discs, I wouldn't use the most abrasive ones though, a 220 one should work to do the heavy work and then go up to 400 and 800 to finish off the slot.
I'm currently restoring a CB550 rotor cover that's been down the road and has some bad gravel rash on it, it's about 80% done and was restored using those discs, I'll post pics of it when finished and I'm sure you'll be surprised just how good these discs are for cleaning alloy, the inside of a caliper body for instance will look new after some light brushing with these discs and they are cheap, you can get around 27 pieces for £8.
https://www.ebay.co.uk/itm/314692515911?hash=item494522b847:g:oUQAAOSwoBRkpjs3&amdata=enc%3AAQAIAAAAwLV96za6Q43eRYqm8FJ6aiJrsd%2BoMDHOxQUCd77uPlqr9YduV6EDM17ZrfMDX6jnnJhylJvKR90AJgHLjPHwrkhs2j%2BKIIjLCKrpYplPDH1a7R5jztAskFfgw%2FTCRL78iyBS2Er3JP7H2oBUbNa90OZ4E8Isk1%2FmIYGOC98SI%2Fp8oUD2u%2BagCp5sDrIYTLYJgPTSNje1fip332tY7CmXh59xmm7dt8l87qnj66y1tpnqAIHIDjOhz2OBK6zbii3Dzg%3D%3D%7Ctkp%3ABk9SR6DyiM2zYg
robvangulik:
I am with Bryan on this, any brush you use only polishes the crud, and as those discs, as you say, will remove alloy, the risk to remove more than just the filth is always there.
It is only one groove per caliper so how much time can you save by doing it mechanically in stead of by hand?
Oddjob:
They aren't particularly aggressive Rob, sure they'll take alloy away if left there too long but they really only remove a few microns. Hence why I said not the most aggressive type which is 80 grit, that would remove any crud in there no problem at all, it wouldn't TBH do any particular damage if used lightly either. I've been using these for a long time now and know exactly what they are capable of and how to use them, I'd say anything pointed like a dental pick for instance stands a far higher change of damaging the alloy than these discs, as you can't really see inside the slot your sort of guessing how much is still left in the corners and how hard to use the pick. I've used these discs on my calipers and the result was really good, super clean and no damage visible.
Trigger:
Bryan is correct, no brush will get in the corners, so a nice angled pick cleans them in good order for a replacement seal ;)
robvangulik:
I've been using the same tool for the last 40+ years, an adapted wheel spoke with two almost 90° bends and a flattened end, doesn't damage anything but scrapes dirt out of any corner without getting my hands in a knot ;)
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