Hi guys, I‘ve got a 99 CB400, been doing recent work on it and when it came to bleeding the front brakes,they simply wont bleedI‘ve checked the master cylinder located below the reservoir and had a worn seal changed in it. After that,checked if it was working and bled just the master cylinder with the hoses to the calipers disconnected, than tried to bleed the calipers but no luck,just a few bubbles from time to time. Sometimes the bubble would actually go back into the hose instead of going completely out.Can anyone help please from personal experience or please redirect me to a post that sheds some light on this situation? I have also checked the hoses, there are no tears. Could changing the washers and putting new ones help?
Very possible it is just a plugged bleeder valve. If the brakes still work, try to clean it out with a small wire. If the brakes are not working, the caliper may need to be rebuilt.
Remove the caliper. Put a piece of wood or metal inbetween the brake pads (where the rotor would go). Hold the caliper high above the master cylinder, then bleed as normal. The air will rise up to the caliper so it will be bled at the bleeder screw.
Try hooking every thing back up all hoses. Check to see if you got any pressure pump it up bleed them, try 2 or3 times.
