BMW K bikes (Bricks)

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1Back to top Go down   Brake bleeding trouble Empty Brake bleeding trouble Tue Aug 28, 2012 5:19 pm

giles4060

giles4060
Silver member
Silver member
Evening all,

Having some fun bleeding the brakes. Bought a cheap vacuum pump to bleed the brakes but the nozzles supplied for the bleed nipples were not great qaulity so ended up introducing alot of air into the modulator and caliper on the rear brake. The brake pedal is now lifeless and rear brake does not work at all.

Anyway I binned the cheap plastic fittings and used a rubber hose. All attachments are now good and snug so no leaks in the system and a good vacuum created by the pump. However now I am unable to get anything from either bleed nipple despite a good pressure on the vacuum gauge, no air leaks and a full resevoir with the lid off.

Any ideas what I have done?


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Giles

K100 RS 1991
R80 GS 1990
    

2Back to top Go down   Brake bleeding trouble Empty Re: Brake bleeding trouble Tue Aug 28, 2012 6:18 pm

yankeeone

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Platinum member
Platinum member
Hi , I have had good success with a very large syringe the type used for horses,load it up with fluid and push the fluid thru from the caliper to the master.

    

3Back to top Go down   Brake bleeding trouble Empty Re: Brake bleeding trouble Tue Aug 28, 2012 9:01 pm

RicK G

RicK G
admin
admin
With the rear brake if you apply too much pressure you can jam the master cylinder piston down the bottom of the cylinder which prevents the fluid being bought through. It feels like the piston is returning but it's only the spring on the pedal.
You will have to release the small socket head screw that prevents the piston comming out. Just back it off a turn and you may hear the piston return.


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"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

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