SOHC.co.uk Forums > CB350/400
New to CB400 four and new here! Front brake improvement?
Mikep328:
I have ordered: braided lines, a new seal and piston for the caliper, and two sets of pads to try, Brembo and Versah. The Master cylinder seems to operate perfectly so I wasn't planning to rebuild it but wonder if it might be a good idea? OTOH, "If it ain't broke don't fix it" is always something to consider... ::)
I was going to start disassembling the brake system today but decided to wait until all the parts get here so the bike isn't "out of service" any longer than it has to be.
K2-K6:
I do a final check with any hand mastercylinder when it's all set up.
Crude but effective, squeeze it with both hands as far as it'll possibly go a few times, until it feels like everything is bending, really severe :o then hold a hand behind the twist grip and hit the ball end of the lever in multiple times to pulse the whole system in a controlled violence :)
During this the lever should repeatedly give the same travel, neither lengthening or pumping outward. All the seals working properly should give absolute consistency under this routine. Any real variables and you'd have to examine why that's the case.
Sounds severe, but properly puts far more elevated pressure through it than any normal use, and always verifying if there's any likely problem.
Final check, after that, roll the wheel to assess release, it should not bind at all after the above. Then ride it to see what ya got.
I do this with every front brake I work on.
taysidedragon:
--- Quote from: K2-K6 on August 03, 2023, 08:28:29 AM ---I do a final check with any hand mastercylinder when it's all set up.
Crude but effective, squeeze it with both hands as far as it'll possibly go a few times, until it feels like everything is bending, really severe :o then hold a hand behind the twist grip and hit the ball end of the lever in multiple times to pulse the whole system in a controlled violence :)
During this the lever should repeatedly give the same travel, neither lengthening or pumping outward. All the seals working properly should give absolute consistency under this routine. Any real variables and you'd have to examine why that's the case.
Sounds severe, but properly puts far more elevated pressure through it than any normal use, and always verifying if there's any likely problem.
Final check, after that, roll the wheel to assess release, it should not bind at all after the above. Then ride it to see what ya got.
I do this with every front brake I work on.
--- End quote ---
Sounds like recipe for breaking levers!
K2-K6:
"Sounds like recipe for breaking levers!"
And when would be a good time to find out if there's a failure point in a brake system ?
I'm reasonably confident that any lever I could get to fail with my hands alone I'd not want to be riding with :)
I work on many MTB hydraulic system too, would never want someone else to ride something I couldn't place absolute confidence in.
In all honesty I've never broken one like this. Leaking banjo, bleed closure etc detected that had given owners previous problems but couldn't be found by someone else working on them.
McCabe-Thiele (Ted):
If you are using a nice soft rubber headed mallet that should not break the lever - I guess it depends how hard you strike the ball end.
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