No front brake pressure

[bboySushi]

So, a month ago my girlfriends bike went down at low speeds, not much damage. At the time the rectifier had gone so I ordered one and let the bike sit in the drive way (I had ridden it home after it went down, nothing seemed too out of place).

Anyways 2-3 weeks later I install the rectifier and it's working fine, electricals are good.

HOWEVER I notice that there is ZERO front brake pressure. I check and the line that connects the reservoir to the master cylinder is ripped. I replace it. I top off the reservoir with brake fluid. I'm pumping and pumping, pumping the lever for an HOUR or more, trying different things. Virtually no pressure. The diaphragm is in the reservoir, the path from the reservoir to the MC is clear. When I bleed the caliper the smallest amount of brake fluid will come out. I tried tie wrapping the lever to the throttle and letting it gravity fill but that didn't really work.

IT's a 2000 R6, and there is no master cylinder bleed valve, just one on each caliper.

What's going on??? This is really frustrating because I feel like I'm missing out on something so small...the brakes were working perfectly fine before half the fluid leaked out so there's no way the MC is suddenly damaged or the leaks busted or something.

What's the secret??? Been pumping that lever FOREVER but ZERO pressure buildup.

 

[Scuba Steve]

Do a you tube search on how to bleed brakes.

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[coyo]

Is the level in the res going down (very slowly) as you pump?

 

[bboySushi]

None of the videos show what to do when there's no front brake pressure.

The level doesn't go down, the amount of brake fluid that can be pushed through is so minimal, a couple of drops out of the bleed valve. The reservoir outlet is fine so it's at least reaching the MC, and something is trickling through. There's no leakage anywhere else that I can spot, but maybe there is another hole in a hose somewhere? but it'd have to be huge to be able to not build up any pressure at all?

 

[Django RideHard]

Could be air in the master cylinder - a vacuum bleeder will do the trick for that. Could also be something has gooched a seal on the piston of the master, which means time to rebuild the master and then a vacuum bleeder will still come in handy.

 

[skapan]

Try using the brake line fitting on the master as a bleeder. The tiniest bit of air will screw things up big time, and you might be able to push it out at the exit of the master. Otherwise, I second the vacuum bleeder idea.

 

[Scuba Steve]

Vaccum bleeder is the ticket took me an hour to bleed my gf's klx brakes last night after changing the line. Lots of patience is key.

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[RockerGuy]

Vaccum bleeder is the ticket took me an hour to bleed my gf's klx brakes last night after changing the line. Lots of patience is key.

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Did you keep brake lever partially depressed while changing the lines?

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[frekeyguy]

bleeding brakes well is not a 1-2 process.

simple answer ` you have air somewhere

 

[bboySushi]

Yes, I thought it was a small clog and was about to buy a manual vacuum bleeder, but turns out there was a lot of air in the master cylinder. The manual doesn't say anything about bleeding the MC so I didn't think you could as there is no valve, but the bolt holding in two brake lines to the calipers apparently goes right into the line...so I bled that and then the calipers and all is well!

I really hate these manufacturer service manuals...they leave out so many important details and steps both for this R6 and my GSXR.

 

[RockerGuy]

I really hate these manufacturer service manuals...they leave out so many important details and steps both for this R6 and my GSXR.

I swear alot reading those manuals

 

[skapan]

You're welcome.