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I'm reading up on this as I want to do my own brake service. This method uses a pressure bleeder but I've been reading about a vacuum bleeder. Some say that the pressure way introduces pressurized air into the system. This is what I found.
You should not use any sort of bleeder that allows air, especially pressurized air to contact brake fluid. All professional brake bleeders use some sort of bladder to seperate the pressurized air from the brake fluid. You wonder why they cost hundreds of dollars vs what you are looking at. Yes you can bleed the brakes quickly, but you are also adding air to the brake fluid. The air bubbles are small, but carry two side effects:
1. They introduce some additional compressibility into the brake system.
2. They introduce some water, through the air, into the brake system. Brake fluid is highly agroscopic and will take this water.
The best form of bleeding brakes is still the two person job. If that is not available, then you should look at speed bleeders.
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