I have been using the same type pressure bleeder since 1988 and have not had any issues with it at all. I keep the bleeder filled about half way and attach it to the adapter on the brake fluid reservoir, open the valve on the hose (if there is one) and then pump it up to about 10 psi. I then wrap a cloth fender cover around the whole thing ( to contain any possible leaks ) and then bleed at each caliper until new looking fluid comes out.

The bleeder I use came from a MAC tool truck but looks just like a fancy garden sprayer, in fact the guy I work with uses a converted garden sprayer and has had good success with it.

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Mercedes Benz Master Tech - Retired