How To: Rear Brake Bleed

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Round the World on an 1199
Your rear brake shouldn't require bleeding very often, but when it does get flaccid, here's your ticket to Viagra-pedal rigidity:

On the left side of the bike under the swingarm you'll find the rear caliper. 1) Cut off the two zip ties holding the ABS line and the Brake line together, taking care not to cut either.
2) Remove the rubber nipple cover.
3) Unscrew the two bolts holding the rear caliper to the swingarm, as shown below.



4) Once off, pull the caliper back and flip upside-down:



5) Shove something solid in between the brake pads. Don't ask why, just do it or you'll be sorry. In this instance I used a allen key.



6) Attach a 12-point box-end wrench to the bleed screw and affix one end of clear tubing to nipple (reference the first pic) and shove the other end into a bottle.



Now it's time for the bleed:

1) Pump brake pedal a few times with your right foot, then hold the lever down.
2) Crack the bleed screw on the caliper with your right hand while holding the caliper upside-down with your left, as in the picture above. (If you have a harmonica, now's a good time to show off by exhaling a tune while balancing on your one free appendage.)
3) You should see air bubbles and fluid seeping out of the nipple into the hose. Close the bleed screw before the brake pedal reaches full extension.
4) Repeat step 2 &3 until all air bubbles are gone.
5) If your rear master cylinder reservoir (the fluid reservoir that sits on the right side of the bike near your ankle) gets to a min. level, top it off with fresh fluid.
6) Once finished, remove the object you placed in between the brake pads, bolt the rear caliper back onto the bike using the proper torque specs (after 25 years of wrenching I trust my internal torque wrench more than an actual one), reattach rubber seal to nipple and zip tie the brake and ABS lines back together again.
7) Press the brake pedal to make sure you didn't screw something up.

*If you want to do a fluid flush, pump a few reservoirs of clean fluid through the caliper using the technique above.
 
With how the heat (I know... What heat???) has turned my fluid black, I think I may get into the habit of flushing the system.

I would not have thought to remove the rear caliper, I would have left it in place, or better yet... Tried to leave it in place.

Glad to have instruction first and foremost.

Thanks for the write-up AntiHero!
 
I had a lot of air in my rear caliper for some reason after a track day a few weeks back. I tried bleeding the rear for 45 min. (including the banjo) with absolutely zero improvement. Flipped the caliper over and 30 seconds later I had a rear brake again.
 
Yet again AntiHero, you surprised me with the sequel I had hoped for!!! Can't wait for your next Best Seller.....

Thank you...
 
Just knocked this out, easier than it looks. Although, I still always get nervous that I didn't get rid of 100% of the air lol.
 
Wow...didnt think of doing it this way...much simpler and more effective...

Great tip Antihero!!!!!! Keep it coming!!!!
 
I had a lot of air in my rear caliper for some reason after a track day a few weeks back. I tried bleeding the rear for 45 min. (including the banjo) with absolutely zero improvement. Flipped the caliper over and 30 seconds later I had a rear brake again.

why do you think that is? Does it have to do with the design of the bleed valve? normally you leave caliper on and pump brake then open valve, is 1199 more complex?
 
why do you think that is? Does it have to do with the design of the bleed valve? normally you leave caliper on and pump brake then open valve, is 1199 more complex?

No idea how air ended up in the system. I didn't touch the rear brake all day, but the fluid was bubbling. ABS on the Panigale is linked, but only when both pedals are depressed....or so it is said. I'm guessing more is going on than what's been stated in the press version of the 1199s ABS system. ABS might not be linked, but the fluid clearly was or I wouldn't have had fluid boil in an untouched rear brake and I definitely wouldn't have lost the rear brake completely without so much as one depress on the pedal all day.

As Zaid has stated, air in the system can't escape by traveling down. It needs to be flipped for a complete bleed.
 
I too tried bleeding the rear brake for 45 minutes with no effect. It never occured to me to flip the caliper over. Thanks!!!
 
I'm going to have to do this before my Trackday. At 700 miles and black brake fluid in my rear reservoir I have no rear brake at all. I'll flush and use motul rbf600 and hopefully get it back.

Thanks Antihero for the detailed "how-to"
 
a mech showed me how to bleed it at the banjo bolt a lot quicker and easier. he told me I was crazy to remove the calipers. Few pumps and i was good to go. Worked like a charm
 
@AntiHero: Thank you so much for this great thread!

Recently I replaced all bleeding nippels and banjo bolts on my Tri with the ones from Stahlbus. Unfortunately I was not careful enough and got some air into the rear brake system. Yessss. It's my stupid fault. I am SORRY!

So, I checked all threads on this great forum.

My plan is to do the bleeding of the system with a vacuum bleeder. The only thing I don't understand (maybe I am just too stupid) and nobody explicitly wrote here is this question:
1. connect "vacuum sucking system" to the brake caliper's bleeding nipple.
2. have enough liquid in the expansion vessel
3. open the nipple, start sucking
Does the brake lever (rear or from) really have to be pulled? And if yes, why? To get the air out of the master cylinder? to get additional pressure if vacuum isn't strong enough? Some even say that the lever should be pulled to its fully extend al the time with a zip tie or a weight.

Please note that the Stahlbus nipples (as many other systems) have a valve that protects the hydraulic system from getting air while bleeding.

Any comment would be highly appreciated!
 
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the rear brake comes flaccid from factory....

:)
yeah, it's the italian style :)
But in my case it was really stupid. I wanted to do a regular bleeding after installing the new nipples of a perfectly air-less system, so I started sucking while my GF on the other side of the bike pumped the brake. I told her to stop when the expansion vessel goes empty. She did, but the "sucking thing" continued to suck the fluid out of the system, until it was too late. It just sucked air into it.

Somehow all this sound like an XXX thread :)
 

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