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K100-forum.com » Technical, repair and troubleshooting » Frame, fairing and wheels » Not enough pressure from the master cylinder

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Biagio

Biagio
active member
active member
Just cleaned all brake calipers and pads, replaced brake fluid and let the air came out.
But now, if I brake, there isn't enough pressure and the lever arrives in contact with the handlebar.
I checked for any air bubble but nothing, still doing it.

Might be that the master cylinder has gone?

    

Toto_jp

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Platinum member
Can you pump up pressure ?
If you can get pressure hold it in ,if it slowly sinks to handle bar then master cylinder is leaking internally or externally might pay to put kit in it
cheers Tony


__________________________________________________
K100 RS 1986
    

charlie99

charlie99
VIP
VIP
check in the master cylinder (fluid remooved ) that both the bleed holes into the cylinder chamber from the resevoir are not blocked ,

it is often found that the front hole (quite small ) is blocked not allowing the right pump action ..probe with a needle ? then flush out .


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

Biagio

Biagio
active member
active member
charlie99 wrote:check in the master cylinder (fluid remooved ) that both the bleed holes into the cylinder chamber from the resevoir are not blocked ,

it is often found that the front hole (quite small ) is blocked not allowing the right pump action ..probe with a needle ? then flush out .

Ok, I'll check it then.

What a shame, time spent on removing all bubbles and now i have to remove everything!!

    

charlie99

charlie99
VIP
VIP
just suck out the fluid in the resevoir ...all the lines should still have fluid in them ...you can do it on the bike ...

just protection from fluid on the paint work required

hope that helps


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

Biagio

Biagio
active member
active member
Nice, didn't think about this option, thank you again

    

Rick G

Rick G
admin
admin
Also check for bad hoses, I have two hoses that were leaking into the outer sheath and making big bubbles in the hose without leaking onto the ground or bike. The more I pumped the lever the bigger the bubbles got and when I stopped pumping they slowly went down.
The symptoms were exactly the same as yours


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

Inge K.

Inge K.
VIP
VIP
Some time back it was a issue like this, which was caused by some non genuine rubber shims fitted between the pistons and the pads.....and these shims was flexing to much.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

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K100-forum.com » Technical, repair and troubleshooting » Frame, fairing and wheels » Not enough pressure from the master cylinder

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