Author Topic: Brakes soft after cleaning  (Read 476 times)

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Offline Davy

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Brakes soft after cleaning
on: 19 February, 2021, 04:06:37 PM
Hi All,
I had the front wheel off my CBF1000A6 so I thought I would give the brake callipers a clean. I was a bit to enthusiastic in way of the piston pots and the middle pot (left side) came out of its bore. I pushed it back in and bleed the brakes but they are now "soft" i.e. the brake leaver pulls right to the throttle grip  :005:
I can't find and leaking brake fluid so I guess it's air in the system. Any ideas how to fix this?  :006:
Last Edit: 19 February, 2021, 04:08:55 PM by Davy

#1

Offline FLIZ

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Re: Brakes soft after cleaning
Reply #1 on: 19 February, 2021, 04:47:42 PM
Oops. Yeah, more than likely air still in the system. You might have to bleed both front callipers, depending on how much fluid you lost when the piston popped out, and maybe the rear as well.
Also you could try pumping the front lever to build up a bit of pressure then tie the lever back to the grip and leave overnight. Good luck. Let us know how you get on. There will be more help available if still no joy.
Donít forget if combined abs model there is a sequence to follow to bleed the full system, and do not let the master cylinder level drop to low.  :028:

#2

Online Art

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Re: Brakes soft after cleaning
Reply #2 on: 19 February, 2021, 05:19:43 PM
+1 Nothing to worry about, you just need to bleed the braking system. While you're there you may as get yourself 1L of DOT4 brake fluid and replace the brake fluid as described here Front brake service

While your there replace the clutch fluid in a similar fashion, there is just one bleed nipple which is found on he clutch slave cylinder.


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Offline FLIZ

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Re: Brakes soft after cleaning
Reply #3 on: 19 February, 2021, 05:32:22 PM
 :460:

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Offline Davy

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Re: Brakes soft after cleaning
Reply #4 on: 20 February, 2021, 04:49:08 PM
I bled the fount brakes last night and tied back the brake leaver overnight - no difference.
I will bleed the rear brake this week and let you know how it goes.

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Offline jm2

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Re: Brakes soft after cleaning
Reply #5 on: 20 February, 2021, 05:12:59 PM
Front left centre - isn't that the rear feed combined.

Use the other bleed nipple and a lot of presure (to overcome the pcv) on the rear brake pedal  - an assistant is useful here.

edit: Untie the front lever and let it settle/pump to it so that everything else is just 'idle' (normal).
Last Edit: 20 February, 2021, 05:14:15 PM by jm2
Only do it right - no bodging please.   Keeper of the failed stator list.   John.

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Offline Davy

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Re: Brakes soft after cleaning
Reply #6 on: 22 February, 2021, 10:35:12 PM
Spent about 2 hours at bleeding the brake this afternoon and at last I have the system purged of air.
There is a bit of a brake rub on the discs but I think a good run will sort that all out and settle things down.
P.S changed the clutch fluid as well.
Thanks for all the helpful replies  :046:

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Online Art

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Re: Brakes soft after cleaning
Reply #7 on: 23 February, 2021, 01:27:01 AM
Happy Days

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Offline FLIZ

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Re: Brakes soft after cleaning
Reply #8 on: 23 February, 2021, 08:39:59 AM
Well done, we knew you would get there in the end.
Thanks for letting us know.  :028: