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Question:

can having having the brake fluid reservoir sitting unlevel on a motorcycle effect how your brakes preform?

I have custom handle bars on my motorcycle and the brakes aren‘t decompressing properly, I suspect its because the fluid Reservoir sits at an angle instead of level like it was designed

Answer:

No, there will be an air pocket at the top of the reservoir, since the reservoir should be above the top of the hydraulic system there is no way the air can get from the reservoir into the hydraulic system without being turned upsidedown. If, for some reason the reservoir is not above the master cylinder, then it could cause a problem at an angle. Your problem is not clear though, could you describe what you mean by the brakes decompressing.
So long as there is the correct amount of fluid in the reservoir, then it should not matter; maybe the brakes need to be bled ?
You have pretty much answered your own question here. The fluid is there to maintain a flooded area right above the master cylinder which is a small actuating piston that applies pressure to your brake pistons when your fingers apply force. If this wasn't here your master cylinder would suck in air and your brakes would be rendered useless as al you would be doing is compressing the air in your brake lines. Very dangerous. Also, when your bike consumes brake pads the material that disappears is taken up by the fluid from your resoviour to compensate. As time goes by you will notice a drop in your resoviours fluid and this would be the cause. Force Pressure X Area You could work that sum anyway you like as it is being applied everytime you squeeze the front and rear of your brakes. Hope this helps.
You have pretty much answered your own question here. The fluid is there to maintain a flooded area right above the master cylinder which is a small actuating piston that applies pressure to your brake pistons when your fingers apply force. If this wasn't here your master cylinder would suck in air and your brakes would be rendered useless as al you would be doing is compressing the air in your brake lines. Very dangerous. Also, when your bike consumes brake pads the material that disappears is taken up by the fluid from your resoviour to compensate. As time goes by you will notice a drop in your resoviours fluid and this would be the cause. Force Pressure X Area You could work that sum anyway you like as it is being applied everytime you squeeze the front and rear of your brakes. Hope this helps.
No, there will be an air pocket at the top of the reservoir, since the reservoir should be above the top of the hydraulic system there is no way the air can get from the reservoir into the hydraulic system without being turned upsidedown. If, for some reason the reservoir is not above the master cylinder, then it could cause a problem at an angle. Your problem is not clear though, could you describe what you mean by the brakes decompressing.
So long as there is the correct amount of fluid in the reservoir, then it should not matter; maybe the brakes need to be bled ?

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