RANBUSH
Ran Bush
Apologies if I posted this already, if I did I can't find it.
The front brakes on my '87 R80RT locked up the other day a short way from home, and the bike wouldn't roll. I loosened the caliper bolts slightly and that freed the front wheel enough to get home. When I got it home I removed the OEM brake lines, cut them in half, and saw that they were plugged up and rotted.
So I installed SS lines but when I tried to bleed the system today I got no pressure at the lever. I was using a new Mighty Vac vacuum pump and it drew some 2" of fluid out of the lines, and the fluid in the reservoir went down to the Minimum mark but when I tightened the bleed screw, removed the Mighty Vac and pumped the brake lever, I got no pressure at the lever and the fluid in the lines had returned to the Maximum mark in the master cylinder reservoir.
I tested the Mighty Vac on a jar of the used brake fluid, and it sucked it up and seemed to be working as expected.
I'm thinking the master cylinder may also be shot.
Ideas ?
The front brakes on my '87 R80RT locked up the other day a short way from home, and the bike wouldn't roll. I loosened the caliper bolts slightly and that freed the front wheel enough to get home. When I got it home I removed the OEM brake lines, cut them in half, and saw that they were plugged up and rotted.
So I installed SS lines but when I tried to bleed the system today I got no pressure at the lever. I was using a new Mighty Vac vacuum pump and it drew some 2" of fluid out of the lines, and the fluid in the reservoir went down to the Minimum mark but when I tightened the bleed screw, removed the Mighty Vac and pumped the brake lever, I got no pressure at the lever and the fluid in the lines had returned to the Maximum mark in the master cylinder reservoir.
I tested the Mighty Vac on a jar of the used brake fluid, and it sucked it up and seemed to be working as expected.
I'm thinking the master cylinder may also be shot.
Ideas ?