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Question:

Do I have to bleed my motorcycle brake if I just opened the reservoir?

I am a very new motorcycle rider. I just learnt to change oil and do small works on my motorcycle. I don t know the mechanism about the brake fluid works, but I know it works using the air pressure. I opened the front brake fluid reservoir without thinking. But I closed it immediately. Do I have to bleed the brakes since I disrupted the vacuum/air pressure? Will this affect by brake performance. Please let me know. Thank you.

Answer:

No, I've not ever had to do it. In future, without sounding harsh, read the manual before touching a system you are unfamiliar with. --Mikey B--
Never affected my brakes and I've been riding for 25 years.
Nope, taking the cap off is not a reason to bleed the brakes.
Unless the reservoir was near empty or empty, you won't have to bleed the brakes after simply removing the reservoir cover. You only have to bleed the brakes if you introduce air into the brake lines or the calipers.
Hydraulic brakes are simple. Disk brakes are super simple. The air does not use pressure. Air is simply the empty part of the fluid reservoir. The fluid is not compressible. Air is. If you get air in the hydraulic lines the you squeeze the air instead of the brakes and you don't stop.

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