Rear Brake Issue

[JAB_TX]

All,
I am new to the forum and have learned a lot from the group so far.  I bought a '97 Valk from an older gentleman that had been sitting in a garage for 7 years.  After a lot of elbow grease and parts replacement I am finally at the last stage (so I think) but I cant seem to get the rear brake to build pressure.  I have already bled the front brakes but the rear seemed to have more issues so I replaced the master cylinder, topped off the reservoir and tried to bleed the rear but I only got a little old fluid out of the caliper and then nothing.  the pedal is complete mush.  I have tried the gravity method, weights over night, checked the banjos for the right torque but still nothing.  After about 50 peddle compressions i checked the bleed valve and it was dry.  Cracked open the banjo at the caliper and nothing.  I am building pressure at the cylinder and there are no visible leaks in the lines.  I can open the bleed valve and get solid vacuum pressure but no fluid.  Any help would be greatly appreciated.

[Ricky-D]

If the pedal is complete "mush" then how can you say you are building pressure at the cylinder.

Start from the cylinder, take the line loose and see if you are pumping fluid.

If so continue back towards the caliper cracking open the joints and seeing if your getting fluid.

Eventually if you are seeing fluid, hand fill the caliper and then bleed the system.

***

[hubcapsc]

If you drained your lines and now you can't get fluid back in them by
putting it in the reservoir and pumping the brake, then it might work
to use a syringe or something to help get the system primed. Hook a
little bit of hose to a closed syringe and to the opened caliper bleed screw
and pull the syringe plunger to hopefully suction fluid into the system from
the reservoir. You might have to do this a couple of times
(take the hose off the syringe before you mash the plunger back in  ),
watch the fluid level in the reservoir, once it starts going down (hopefully)
then you'll start being able to bleed as normal pumping the pedal.

Anywho... this has worked for me several times...

-Mike

[da prez]

You may have a hose that failed on the inside. They will delaminate.  If you need a hose , PM me.

                da prez

[JAB_TX]

UPDATE: Removed the brake line piece by piece and found a clog.  Brake works like new again.

[yrunvs]

Thanks for the update. Final updates on resolutions are the most helpful posts of all.

[hubcapsc]

UPDATE: Removed the brake line piece by piece and found a clog.  Brake works like new again.

Clog? A solidified blob of this goo I found in the caliper of some
brakes that really needed cleaning? Or some other kind of clog...?



-Mike

[Madmike]

UPDATE: Removed the brake line piece by piece and found a clog.  Brake works like new again.

Clog? A solidified blob of this goo I found in the caliper of some
brakes that really needed cleaning? Or some other kind of clog...?



-Mike

That looks like the snot the develops when you mix brake fluid and oil.  Saw it on Wagner log stackers some used brake fluid and some used ATF in their brake systems, sometimes got contaminated.

[Tfrank59]

Well you said the bike sat for 7 years of course you're going to have that kind of muck buildup and you'll probably need to purge all of the hydraulics on the bike if you haven't already including the clutch