10-12-2018, 05:45 PM
problem solved;
it turned out that the low pressure seal on the back of the piston had swollen up to the point that it could not readily always return to the end of the stroke ( the return point )
After removing some of the seal that appeared a bit soft it is now running free again and the problem has cleared, the brakes are not dragging anymore!
Why did this happen? i probably caused it myself, i like to put some lubricant on the back part under the dust seal around the circlip area to prevent oxidation just in case some brake fluid seeps past the low pressure seal, i must have used the wrong type of lube that slowly reacted with the rubber and swelled it up over the years, the circlip area was well lubricated when i took it apart and i lubed it again but this time used " red rubber grease " which is especially made for these applications.
The brakes are now working fine, a lesson learned and a short video posted on YT.
https://www.youtube.com/watch?v=QM5Wh6Gs...e=youtu.be
By the way the master cylinder for these brakes is identical and use the same part numbers for the replacement parts
(master cylinder set 45530-ma4-671 )
as our cb1100's which is why i think this was relevant to post on the group.
Thanks for all the helpful replies from the members.
it turned out that the low pressure seal on the back of the piston had swollen up to the point that it could not readily always return to the end of the stroke ( the return point )
After removing some of the seal that appeared a bit soft it is now running free again and the problem has cleared, the brakes are not dragging anymore!
Why did this happen? i probably caused it myself, i like to put some lubricant on the back part under the dust seal around the circlip area to prevent oxidation just in case some brake fluid seeps past the low pressure seal, i must have used the wrong type of lube that slowly reacted with the rubber and swelled it up over the years, the circlip area was well lubricated when i took it apart and i lubed it again but this time used " red rubber grease " which is especially made for these applications.
The brakes are now working fine, a lesson learned and a short video posted on YT.
https://www.youtube.com/watch?v=QM5Wh6Gs...e=youtu.be
By the way the master cylinder for these brakes is identical and use the same part numbers for the replacement parts
(master cylinder set 45530-ma4-671 )
as our cb1100's which is why i think this was relevant to post on the group.
Thanks for all the helpful replies from the members.