Rear Brake Fluid Reservoir Change - Yamaha R6 Forum: YZF-R6 Forums
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post #1 of 12 (permalink) Old 05-13-2019, 02:24 AM Thread Starter
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Rear Brake Fluid Reservoir Change

Has anyone done one? On my R6 2000 Model its looking faded and looking brittle and i have a new one to put one but have a question!

Can i some how change it without having to bleed the fluid?

Cheers.
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post #2 of 12 (permalink) Old 05-13-2019, 08:45 AM
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Re: Rear Brake Fluid Reservoir Change

yes...forceps to pinch the line. Or just make it a 3" piece of tygon
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post #3 of 12 (permalink) Old 05-13-2019, 05:58 PM
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That’s a good idea, but wouldn’t some air still be trapped in the hose above where it is pinched.
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post #4 of 12 (permalink) Old 05-14-2019, 03:58 AM
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Re: Rear Brake Fluid Reservoir Change

As long as you leave fluid in the hose between the mc and the reservoir, so the master cylinder doesn’t get air in it, you won’t need to bleed the system. Although bleeding the system periodically is a good idea.
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post #5 of 12 (permalink) Old 05-15-2019, 04:14 PM
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Re: Rear Brake Fluid Reservoir Change

Personally, I would probably do a quick bleed along with it, just for the hell of it.
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post #6 of 12 (permalink) Old 05-16-2019, 01:26 PM
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Re: Rear Brake Fluid Reservoir Change

You use the rear brake?


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Some people leave air in the rear brake line to ensure that they don't lock it up in a panic situation. If the res looks brittle and faded and is a sign of distant past maintenance, I'd get a couple bottles of brake fluid and flush front and back.
I mean, it's your brakes.

Do you have to leave so soon? I was just about to poison the tea.
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post #7 of 12 (permalink) Old 05-18-2019, 05:07 AM
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If your changing the res because it’s too old, you definitely need to flush the fluid. With questions like this concerning brakes, you should probably take your bike to a shop.
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post #8 of 12 (permalink) Old 05-19-2019, 09:24 AM
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Re: Rear Brake Fluid Reservoir Change

Quote:
Originally Posted by Helihover View Post
If your changing the res because it’s too old, you definitely need to flush the fluid. ...........................
Quote:
Originally Posted by oldbonez View Post
.............If the res[ervoir] looks brittle and faded and is a sign of distant past maintenance................
Regular, direct sun exposure, actually; both the fading and the cracks from a combination of the plastics degrading and thermal expansion/contraction.


============================


BTW, avoid letting hot water touch any rubber. It will irrecoverably stretch the rubber topper used in that reservoir. Fortunately I had an extra.

Replaced cracked front master cylinder and bled the replacement quite a bit too well. (used velcro strap to force the lever while I cracked the bleed screws) The lines are under so much pressure now, that the front wheel is a little hard to roll by hand and touching the lever begins to significantly slow the bike, before the brake switch is engaged to light up the rear. I'll have to go back and release some pressure from the system. I may be able to use paper or business cards as a spacer between pad and rotor.

As implied by others, unless you're a 300 pounder, the rear won't handle a lot before sliding. I've used more rear than normal (not to the point of sliding) to help balance out some of the tire wear... and also because I thought it would create less wear on the front pads. But I've seen now that the front pads last forever anyway so no point. The manual tells you to use some rear, but using more than designed/intended eats the pads for lunch. But they're cheap and quick/easy to swap. If you're not using organic pads for the rear, using too much rear will also chew through your rotor, necessitating early replacement. (and that isn't cheap or quick)

The forward most pad carrier for the rear caliper can also get damaged/worn/indented, keeping the pad from backing off like it should. That pad carrier is apart of the bracket support. (#10)

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Good to take a peek at that when doing a pad/rotor/caliper service.
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post #9 of 12 (permalink) Old 05-19-2019, 09:28 AM
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Re: Rear Brake Fluid Reservoir Change

Also avoid overfilling that reservoir. As the braking system heats up, the parts and liquid will expand. If it's overfilled, it will slowly lockup your brakes.
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post #10 of 12 (permalink) Old 05-19-2019, 11:02 AM
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Re: Rear Brake Fluid Reservoir Change

Quote:
Originally Posted by JustGoRiding View Post
Personally, I would probably do a quick bleed along with it, just for the hell of it.
reread my post. Even if you had coffee colored fluid in the system... there is enough hydraulic pressure to lock the rear brake up.
Go to any motorcycle junkyard with a sealed brake system... still works.
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