SOHC.co.uk Forums > CB350/400
CB400 - Front Brake Bleeding.
kevski:
Do the ptfe tape bit this will stop air getting in around the nipple, and keep the reservoir topped up whilst bleeding, pull the lever slow nipping up the nipple just before the lever reaches the bars, this will work, i have never used an auto bleeder and don't see the need to ever use one.
mike the bike:
+1 on using PTFE tape. It also prevents bimetallic corrosion.
Integra99:
Thanks guys will pick some up tomorrow!
gtmdriver:
--- Quote from: MrDavo on February 07, 2018, 06:35:16 PM ---It is possible that you are pulling the lever too far, past its normal travel when you are trying to bleed it. if this is the case, particularly if you are pulling the lever all the way to the grip, you'll never do it, ask me how I know.
I'm pretty sure there is a service bulletin that advises you to tape a suitable object to the grip, to stop the lever from travelling further than it should.
The rear disc on my Sportster can only be bled using 'baby steps' - if you push the pedal to far, even just once, the piston sticks in a part of the bore it never normally sees, and you are fecked until you take it to bits again. I learned this the hard way, too :(
--- End quote ---
I have a copy of the service bulletin and it basically tells you to tape a 15mm spacer between the lever and the grip to prevent the seal on the piston in the master cylinder travelling too far and uncovering a port which can allow fluid into the wrong side of the seal.
How big are the bubbles you are seeing in the fluid coming through?
Air in the system shows up as large bubbles in the fluid. If you are getting lots of tiny bubbles then that is more likely to be cavitation of the fluid as it is squeezed through the small apertures at high pressure.
You can prevent air entering the system around the bleed nipple simply by closing the nipple at the end of each pressure stroke.
When I rebuilt the system on my 350F it didn't seem to bleed all that effectively leaving me with a soft feel to the lever and too much free movement but a couple of days later the free travel had disappeared and the lever feel was solid.
robvangulik:
Is this the Service Bulletin you are looking for?
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