Failing to bleed brakes. Please help. - Page 2 - Yamaha R6 Forum: YZF-R6 Forums
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post #11 of 18 (permalink) Old 09-05-2019, 12:00 AM
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Re: Failing to bleed brakes. Please help.

Fill your brake hoses with fluid from the calipers instead up through the reservoir.!
No bleeding needed if you do it like this.
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post #12 of 18 (permalink) Old 09-07-2019, 03:41 AM
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Re: Failing to bleed brakes. Please help.

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Originally Posted by wdkwang View Post
Update: My mechanic buddy bled the brakes using my reverse pressure bleeder but managed to get it down right. What he did differently, which is not in the user manual or any other youtube vid, was direct both ends of the tubes into the Motul brake fluid bottle and get squeezing the gun until there was no air in the tubing. From there, he put 1 end of the tubing to the bleeder valve and started forcing fluid in. This way, the reservoir doesn't "burp" as the manual calls it with a bunch of bubbles coming up. It was quick and easy.

The rears were a bitch though. We did it according to the book but the rear brakes weren't grabbing as they should so we kept bleeding it several times over. Eventually, we came to the conclusion that the new rear Vesrah pads need time to get bedded in since they're fresh. A few runs on the street and highway got it feeling good again.

In the future, I'm going to make sure I bed-in fresh pads for a week before bleeding the brakes to avoid confusion as to what is going on.

Thanks for all your help guys.
if the brake lever feels soft/spongy then it's not bleed good enough. all brake pads need bed in first before they will work properly. however if you don't clean the old pad materials from the rotor they will never bed in properly. so I hope you at least sanded the old pad material off the rotors if you changed pad brands and compounds.
so sand the rotors you can use a red scuff pad or 120 grit sandpaper. or look up "rotorhone". lightly sand the rotors it doesn't need a super hard scrubbing.
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post #13 of 18 (permalink) Old 09-07-2019, 10:59 AM
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Re: Failing to bleed brakes. Please help.

um you NEVER use brake cleaner anywhere near seals. I would be looking at them closely... brake cleaner + rubber seals = disaster.
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post #14 of 18 (permalink) Old 09-07-2019, 07:59 PM Thread Starter
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Re: Failing to bleed brakes. Please help.

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Originally Posted by yamahacrazy View Post
if the brake lever feels soft/spongy then it's not bleed good enough. all brake pads need bed in first before they will work properly. however if you don't clean the old pad materials from the rotor they will never bed in properly. so I hope you at least sanded the old pad material off the rotors if you changed pad brands and compounds.
so sand the rotors you can use a red scuff pad or 120 grit sandpaper. or look up "rotorhone". lightly sand the rotors it doesn't need a super hard scrubbing.
Ya i followed the guide of multiple youtube vids to sand down the rotors. KurveyGirl.com conveniently sent me a sanding block with my order of Vesrah brake pads. Even though the Vesrah rear JL pads say no need for bedding, it definitely did need it. I went around a park doing a lot of accelerations and braking, and even dragging the rear brakes on purpose while accelerating. It's now stopping well - both front and rear.

I think people exaggerate how good pads are. The front RJL pads with SS lines are an improvement but it didn't blow my mind. I think I can still brake harder and faster in my Nissan 370z.
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post #15 of 18 (permalink) Old 09-08-2019, 03:45 PM
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Re: Failing to bleed brakes. Please help.

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Originally Posted by wdkwang View Post
Ya i followed the guide of multiple youtube vids to sand down the rotors. KurveyGirl.com conveniently sent me a sanding block with my order of Vesrah brake pads. Even though the Vesrah rear JL pads say no need for bedding, it definitely did need it. I went around a park doing a lot of accelerations and braking, and even dragging the rear brakes on purpose while accelerating. It's now stopping well - both front and rear.

I think people exaggerate how good pads are. The front RJL pads with SS lines are an improvement but it didn't blow my mind. I think I can still brake harder and faster in my Nissan 370z.
a set of ferodo ST pads blow away everything I've ever tested. that's what I use now.
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Last edited by yamahacrazy; 09-08-2019 at 03:48 PM.
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post #16 of 18 (permalink) Old 09-08-2019, 05:37 PM
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Re: Failing to bleed brakes. Please help.

The 03 doesn’t have a bleeder on the master cylinder. But air does get trapped at the banjo bolt. You need to pump the lever like you did for the calipers and while holding the lever in crack the banjo bolt loose and re tighten it to get that bubble out.
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post #17 of 18 (permalink) Old 09-08-2019, 08:39 PM Thread Starter
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Re: Failing to bleed brakes. Please help.

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a set of ferodo ST pads blow away everything I've ever tested. that's what I use now.
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did you also have the vesrah rjl's as well before the ferodo st? how are these on the street? my bike is all street except for a handful of anticipated track days a year
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post #18 of 18 (permalink) Old 09-09-2019, 01:09 AM
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Re: Failing to bleed brakes. Please help.

The zip method worked for my RJ03/5MT when I had issues with bleeding the lines, let the brake with the zip over night.
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Sometimes the air bubbles need some time to collect in the "highest" point.
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