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Doesn't sound like a small leak if the fluid had drained out. Was there a puddle? Best case you have to flush the line that drained - after you fix the leak or replace the caliper. Since air entered at the resevoir, it's best to flush all the brake lines. Gotta fix the leak before you can bleed.
To bleed depends on what year car you have. I don't recall the exact sequence (ex. left rear first, right rear second, etc.), but on cars with ABS (such as mine) the rears can be bleed via the ABS pump. Theres a lot of info on the BB here regarding people's individual techiques. I installed a product called Speed Bleeder's on my calipers. They have a internal cutoff valve which makes solo bleeding easier. For rears, I hook up a hose to my bleeder, open it (has the valve so no air is let in) then turn ignition key until pump runs and press the pedal. The ABS pumps a bunch out in one or two long presses.
The laymans approach is best done with two people. Person in the drivers seat depresses the pedal, then the helper cracks open the bleeder screw on the caliper and closes it. Then the driver releases the pedal. Do this a bunch of times for each caliper (in the brake sequence recommended by the manual). Make sure to top off the fluid in the resevoir periodically so it doesn't run low and force you to start over. On a final note, really soak the bleeder screws with PB Blaster or penetrating oil for a long time before starting this process. They are likely really corroded and may snap off as you try to open them. This seemingly simple proceedure can get real ugly fast when you start snapping bleeders off. Been there.
Good luck
burlyb
'90 SPG
posted by 67.250.208...
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