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1Back to top Go down   Rear brake not working - master cyllinder? Empty Rear brake not working - master cyllinder? on Mon Apr 15, 2019 12:26 pm

StefanMajonez

StefanMajonez
active member
active member
Hi!

I was riding around on some wet asphalt, pressed the rear brake. It worked well, but the moment ABS activated, the brake lever slowly (~1 second) went all the way down.

Now when I press the brake, the lever slowly goes down. My first thought was that I bust a brake line and have a slow leak somewhere, but the brake fluid level stays the same no matter how many times I press it.

I'm posting this here for a sanity check and to make sure what I'm thinking is the problem - the master cylinder seal isn't sealing properly and i

EDIT: Found this, is it a good idea?

Also, fun photos for all to rejoice upon my luck.

Rear brake not working - master cyllinder? LxejvT4
Rear brake not working - master cyllinder? Zzm89bf
Rear brake not working - master cyllinder? OKaPDxg
From what I've read this is non-serviceable and I have to buy a new one.



Last edited by StefanMajonez on Mon Apr 15, 2019 2:28 pm; edited 1 time in total


__________________________________________________
1994 - BMW K1100LT
Dyno results 2017


Previous bike:
1989 Honda CB450S
    

mike d

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Life time member
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I would be checking the flexible brake hoses. With age they can suffer internal damage. This may be seen when you apply the brakes as the pipe can swell up like a balloon, but return to normal size when you release the brake.

Mike

    

StefanMajonez

StefanMajonez
active member
active member
@mike d wrote:I would be checking the flexible brake hoses. With age they can suffer internal damage. This may be seen when you apply the brakes as the pipe can swell up like a balloon, but return to normal size when you release the brake.

Mike

Just checked it, no swelling anywhere on the lines.


__________________________________________________
1994 - BMW K1100LT
Dyno results 2017


Previous bike:
1989 Honda CB450S
    

brickrider2

brickrider2
Life time member
Life time member
Hi Steven,
You can apparently get a new (Chinese) rear brake pump for very little money.  There have been a few posts on this here in the forum.  Buyers report the quality of the Chinese replacement is very high; they are satisfied with it. Good luck.


__________________________________________________
1996 K1100LT
    

StefanMajonez

StefanMajonez
active member
active member
@brickrider2 wrote:Hi Steven,
You can apparently get a new (Chinese) rear brake pump for very little money.  There have been a few posts on this here in the forum.  Buyers report the quality of the Chinese replacement is very high; they are satisfied with it. Good luck.
Yeah, I found this thread, and actually found the exact pump they're talking about locally. I'll have it this week probably.


__________________________________________________
1994 - BMW K1100LT
Dyno results 2017


Previous bike:
1989 Honda CB450S
    

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