SOHC.co.uk Forums > CB350/400
New to CB400 four and new here! Front brake improvement?
TrickyMicky:
--- Quote from: Mikep328 on August 02, 2023, 03:40:02 PM ---Thank You! With the caliper removed (or just loosened), the spring easily moves the arm/pad back on its own. The piston/pad is not noticeably retracting back into the caliper when brake pressure is released. I'm now wondering if a new seal is needed. Sounds like caliper disassembly/inspection would be a good thing...
--- End quote ---
. Just be aware that, as somebody else said, when releasing the brake pressure the only returning movement is the seal regaining its original position, which is negligible. Once the whole ensemble is assembled, and on the bike, the movement of the pad/calliper is barely visible to the naked eye. Can't remember the clearance, it's in the workshop manual which is out on the garage at present, but I'm sure somebody with a better memory than me can help!!
Nurse Julie:
0.15mm
Mikep328:
I checked it both with excessive clearance and the workshop manual clearance. In both cases, after applying the brake/releasing it, there was zero clearance between the rotor and either pad. Even the smallest blade (.05mm) of a feeler gauge set could not be inserted.
Bryanj:
Thats Honda-classics.co.uk near daventry, he does lots of stainless bits and special tools, even decent price sets of tappets caps
K2-K6:
If you take the caliper hydraulic side off then hold it in your hand so your fingers are on the bare piston, now squeeze the brake just a tiny bit, you should feel the piston move back in when released, like a tiny heartbeat :)
This shows the seal is soft and chewy, with enough clear geometry in the groove to operate correctly. If it just moves out only, then the groove at least is not clean.
If you've not got this characteristic on any caliper really, the pads will always rub too much, possibly glaze too.
It's imperative the groove is fully cleaned to produce best operation. Lubricate with silicone grease (it's in the original Honda manuals) that groove and seal to keep it this way as long as possible. This largely stops water (road salt etc) getting into there and causing galvanic corrosion again, it is the only real weather sealing strategy of many caliper with single seal and no boot to protect them from water.
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