Take other reviews of this product with caution. People complain about air bubbles being drawn in around the nipple and rubber bushing. It is true. So what? This is just a sign of a good vacuum cleaner. This air does not get into the braking system. It is drawn into a vacuum chamber from the outside of the caliper. I used this to vacuum the brake lines on a 30ft RV. It worked great, bubbles and all. I turned on the vacuum and then opened the nipple 1/2 turn while holding the vacuum line so it wouldn't slip off. I then went in and performed the old brake bleed procedure of checking the fluid level in the master cylinder. The RV has such a long run and lots of high air seats that you want to sit on. The vacuum combined with bleeding the brakes created enough flow to keep the air bubbles moving. I then went back and closed the nipple before stopping the vacuum. I went from soft, spongy, dangerous brakes to a hard pedal. I did it on my own with no help and didn't spill a drop of brake fluid. It took less than an hour from start to finish. I wish I had bought one of these years ago.
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