Stoney
CB750 Member
Hi guys. I have a 1978 cb750k which despite my best efforts, is refusing to brake effectively (front brake only, rear is great).
In my troubleshooting journey I have...
I'm starting to wonder if the rotor might be the issue, although it appears to be in perfect condition with no scoring.
I will be replacing the piston and seals next.
I'm also looking to splash out on a proper tool for removing air from the system as I know that this can be a huge problem and I understand that the old school method (pump lever, hold lever, loosen bleed nipple, tighten bleed nipple, repeat) is probably not effective enough to guarantee results.
If anyone can either re-affirm one of my next planned steps or suggest something else I might be overlooking that'd be great. The bike is off the road right now because of this problem and I'm yet to ride it! Very frustrating.
Cheers now.
In my troubleshooting journey I have...
- Replaced both brake pads with new ones
- Replaced brake fluid
- Tested system with a brand-new master-cylinder
- Bled the system about a dozen times (albeit without the proper equipment, although I'm fairly sure there is no more air in there)
- Dismantled and cleaned out caliper, there is some light pitting on the piston but it appears to move in and out (maybe a couple of mm?) well with application of brake lever
- The lines have been replaced with stainless steel aftermarket ones
- Gapped the floating brake pad as-per manual specification
I'm starting to wonder if the rotor might be the issue, although it appears to be in perfect condition with no scoring.
I will be replacing the piston and seals next.
I'm also looking to splash out on a proper tool for removing air from the system as I know that this can be a huge problem and I understand that the old school method (pump lever, hold lever, loosen bleed nipple, tighten bleed nipple, repeat) is probably not effective enough to guarantee results.
If anyone can either re-affirm one of my next planned steps or suggest something else I might be overlooking that'd be great. The bike is off the road right now because of this problem and I'm yet to ride it! Very frustrating.
Cheers now.