BenzWorld Junior Member
Date registered: Jan 2009
Mentioned: 0 Post(s)
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I agree with gregs210 regarding the usefulness of opening a bleeder before compressing the caliper piston. Years ago I blew out the master cylinder on an Audi from pushing the piston back into the caliper way too fast.
Since then I always hook up a piece of hose to the bleeder and run the other end of the hose into a plastic bottle, with enough clean brake fluid in it to cover the end of the hose. Then open the bleeder and push the piston in. I still go slow, but this way there's nothing going back up the line to mess up anything. Tighten the bleeder before you release pressure from the piston so no chance of air getting into the line.
Maybe not how a professional would do it - but I'm in no hurry and better safe than sorry. Cost and time to replace a master cylinder and flush whole system, I'd rather avoid.