jonnyrotton
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Posts: 49
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Registered: Aug 22, 2017 21:35:36 GMT -7
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Post by jonnyrotton on Dec 30, 2017 18:00:05 GMT -7
I am getting ready to install an r1 Master cylinder and braided brake lines on the fz. I have a pneumatic brake bleeder, but was wonder if it is not enough to completely empty the abs pump and get all the air out, if the abs pump had to be cycled? And if so, how can a backyard mechanic perform the cycle process without any special tools?
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mrhix
Full Member
Posts: 119
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Registered: Sept 11, 2016 19:24:17 GMT -7
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Post by mrhix on Dec 30, 2017 19:56:24 GMT -7
Well, you shouldn't just take a short ride and lock up the brakes a few times . . . . like I did.
SAFETY DISCLAIMER!
You might be able to get the bike up on stands, turn off the TCS, get both wheels spinning, and apply one of the brakes at a time?
Cheers,
MrHix
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Post by RedAndBlack on Dec 31, 2017 1:03:17 GMT -7
I had to cycle the ABS to help bleed my brakes after the same mods. I did the same, just rode it around and locked the brakes up a couple times. Low speed, like coming to a stop light and I did each brake individually.
You could also find a gravel patch or dirt road and that'll help the ABS kick in but it wasn't that hard to do.
I had to bleed my brakes numerous times over maybe a two week period. You really have to go and ride the bike and zip tie the brake lever overnight a few times. Eventually all the air will move up and out of the system. My brakes were pretty spongey after the first bleed and gradually improved after the overnight zip tie, some rides, and cycling the ABS through the natural course of riding. Now the brakes are amazing. Even better than my track bike that has same mods but not the steel braided brake lines.
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srosa
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Post by srosa on Jan 1, 2018 22:29:14 GMT -7
I am getting ready to install an r1 Master cylinder and braided brake lines on the fz. I have a pneumatic brake bleeder, but was wonder if it is not enough to completely empty the abs pump and get all the air out, if the abs pump had to be cycled? And if so, how can a backyard mechanic perform the cycle process without any special tools? I have the same mods and ultimately used a pneumatic brake bleeder in conjunction with speed bleeders that were included in the brake line kit I purchased. In my case, I did not have to cycle the abs pump to extract all of the air (at least from all indications). It may have been luck but I did do an extra step that may have helped. After pre-bleeding the r1 master cylinder with vacuum, I gave the system what I call a "gravity bleed" where I allowed a fair amount of new brake fluid to flow through the pump and then exit out of a caliper using gravity only. Procedure: Keeping the reservoir topped, pre-bleed the MC. Set up a bleeder tube on one caliper and crack the OEM style nipple (not speed bleeder) allowing 6-8 oz. of fluid to pass using gravity only. After all the visible sputtering in the drain tube goes away, I then go back and perform the normal bleeding process on both calipers using vacuum and lever pulls (and speed bleeders if I use them). I have no proof that the extra gravity bleed helps to free trapped air but I always do this after swapping lines, abs or not. |
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jonnyrotton
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Posts: 49
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Registered: Aug 22, 2017 21:35:36 GMT -7
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Post by jonnyrotton on Jan 1, 2018 23:43:46 GMT -7
Hmm, that gravity bleed is interesting. I think I'm going to use the pneumatic brake bleeder to empty the lines, then use my syringe to reverse fill the lines.
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