Bleeding rear calliper

[Ernie]

Hi, I am having serious trouble bleeding the rear calliper on my 1980 GS1000G. I have followed the instructions in the shop manual to the letter but I still have a spongy pedal. The brake works but only just. If I pump the pedal it eventually becomes hard so I think it's a sure sign there's still air in there somewhere.
Any suggestions would be much appreciated.

[Jon78gs1000]

Don't know if you want to but here goes.
You can take the caliper and brake line off-but dont disconnect them.
Hold the caliper up in the air with a piece of steel or somthing between the brakepads to keep the pads as far out as possible.
Then start to bleed them-the air if any will make its way up the lines and out the caliper.
Hope this helps. :-)

[fgh]

If you can get a good pedal by repeated pumping it is a sign of a bad master cylinder.

[Ernie]

Thanks for the advice guys. Will try the "calliper up in the air" trick & see if that works. Don't think master cylinder is bad as it's only 3 years old & the brakes were fine until I disconnected the hydraulics. Had a seized bolt between the torque arm & calliper so had to take the whole assembly off so that I could drill out the seized bolt. replaced it with a stainless bolt with lots of copper grease.
I am fairly sure that air is trapped behind one of the pistons because when I apply the brake the outer piston pushes the disk over & pushes back the inner piston. I wouldn't have thought this could happen if there was no air in the system as there would be equal pressure on the 2 pistons. Both the pistons moved freely when I had the calliper off.
Will let you know how I get on tomorrow.8-[

[Ernie]

Got it sorted. removed calliper & got it as high as possible with the bleed nipples uppermost. Got loads more air out & brakes are now back to normal. Don't think I would ever have got it bled if I had kept following the shop manual instructions.
Thanks for the help guys!:-D

[Jon78gs1000]

The only way I knew to do that was that I had a Yamaha 400 Maxim and spent HOURS!!!! trying to bleed the Dam thing :-D
All of a sudden I got a thought,rarley happens :-({|= ( sorry its whine and cheese time)
And IT worked
I'm glad I could help :-D