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Old 01-06-2019, 09:30 PM   #1
_Chris_
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Plastic button/valve at bottom of brake reservoir - What does it do?

Hello everybody,

I just wanted to flush the front brake on a new to me 2018 BMW G310R. Upon opening the reservoir, I discovered a white plastic button/valve. I've never seen something like this before, I'd assume it regulates the brake fluid flow towards the cylinder. As you can see, it is surrounded by a spring-style ring and it came out of the housing at the bottom of the reservoir. I wonder if a) anyone knows its purpose/has seen it before b) can tell me which side is up/down ( it's asymmetrical ) and c) if there is any trick or tools required for inserting it back into the housing.

Thank you so much,
Chris



Last edited by _Chris_; 01-06-2019 at 09:31 PM..
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Old 01-07-2019, 12:26 AM   #2
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I believe it's simply a cover or cap over the intake and compensating ports. During use, brake fluid can shoot out of the ports with a fair amount of force which has the possibility of introducing air into the fluid. By keeping any turbulence below the air at the top of the resevoir, the fluid stays air free.

I may be wrong.
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Old 01-07-2019, 07:12 PM   #3
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Originally Posted by ST Guy View Post
I believe it's simply a cover or cap over the intake and compensating ports. During use, brake fluid can shoot out of the ports with a fair amount of force which has the possibility of introducing air into the fluid. By keeping any turbulence below the air at the top of the resevoir, the fluid stays air free.

I may be wrong.
Also, some have a cover on them to keep brake fluid from squirting up and out onto your paintjob while pumping the lever when bleeding brakes.
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Old 01-07-2019, 07:35 PM   #4
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Originally Posted by kuksul08 View Post
Also, some have a cover on them to keep brake fluid from squirting up and out onto your paintjob while pumping the lever when bleeding brakes.
Yes, another purpose.
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Old 01-08-2019, 01:26 PM   #5
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Old 01-08-2019, 01:46 PM   #6
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When cleaning out the reservoir, it's always a good idea to pop the cap/cover off and make sure it's clean underneath. (As you have done, OP.)
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Old 01-08-2019, 05:47 PM   #7
_Chris_
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Thank you everybody for the feedback.

For future references, there is only way how you can insert it ( round side up ), here is the picture:

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Old 01-09-2019, 04:55 AM   #8
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Why are you doing a flush on an almost new bike?
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