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Offline marky99925

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rear piston popped out
« on: 17 April, 2020, 03:47:11 PM »
Hi ALL
Dedided to clean the crap off the edge of the rear caliper pistons on my 2006 cbf1000 Abs, made the classic mistake of popping the middle piston out, small fluid leak and pushed it back in ok, but no pressure at pedal now. Never made this mistake in 40 years ! Well i have now..is it just a brake bleeding thing if it sucked air in? Thanks guys

Offline FLIZ

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Re: rear piston popped out
« Reply #1 on: 17 April, 2020, 03:59:23 PM »
Oops. Yeah it will definitely need bleeding.

Offline marky99925

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Re: rear piston popped out
« Reply #2 on: 17 April, 2020, 04:23:12 PM »
cheers, fliz, oops indeed, i feel such a twat, damn this lockdown

Online Art

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Re: rear piston popped out
« Reply #3 on: 17 April, 2020, 05:18:19 PM »
While your there why not replace the fluid? DON'T drain the system just flush it using the new fluid to flush out the old fluid, keep bleeding until fresh fluid emerges at the nipple.

Offline FLIZ

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Re: rear piston popped out
« Reply #4 on: 17 April, 2020, 05:58:27 PM »
Well, we have all felt like that when made mistakes trying to do the right thing, then it goes wrong. Head in hands moments.

No great loss though. I agree with Art perfect time to do a fluid change, front and back.
Must stress as well though flush old out with new. DO NOT drain the system.

Let us know how you get on.   :028:

Online Art

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Re: rear piston popped out
« Reply #5 on: 17 April, 2020, 06:27:42 PM »
Do the clutch with the left overs  :169:

Offline marky99925

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Re: rear piston popped out
« Reply #6 on: 17 April, 2020, 07:19:23 PM »
Hi Guys
i would do as you say but i'v just had all fluids changed by honda, brake, clutch, coolant the whole lot, as part of the 32k service, valve clearances the lot, then mr DIY gets involved..... at least the pistons are shiny now...
Just checking out the bleeding process, ive got a hose with a one way valve so will take it from there, apparently those vacuum operated things make it easier.
i cleaned the front pistons without incident last week, i suppose you can't win them all!
was supposed to leave for Spain tonight but that's out so i've got plenty of time on my hands...
Thanks for today

Offline marky99925

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Re: rear piston popped out
« Reply #7 on: 17 April, 2020, 07:24:06 PM »
one other thing, as the brakes are linked, why hasnt the mishap affected the front brake as well? braking at the front is normal. cheers again

Offline g5guzzi

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Re: rear piston popped out
« Reply #8 on: 17 April, 2020, 09:54:23 PM »
The back brake linked system only operates one piston in the
right hand front brake caliper . The front brake operates the
other five pistons. This means there is a good chance the
middle piston on the r/h front may need bleeding as well if
air has got into the link pipes.
You may get away with just bleeding the rear caliper.
Malc

Offline marky99925

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Re: rear piston popped out
« Reply #9 on: 18 April, 2020, 10:20:07 AM »
cheers malc
Reading up on it you're right.
The process for the rear caliper says to do the front right as well, so i'll do the belt and braces, god knows i've got enough time....

 


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