If your doing a one man brake bleed, you would have a tube attached to the bleeder valve,
the other end submerged in brake fluid, so when your pumping the brakes to bleed the air
bubbles out, no air can go back into the brake system. good luck!
Short answer: so it won't **** air back in to the system.
Long answer: When you bleed your brakes, your attempting to expell old fluid and air from the system. When your brakes feel spongy, it is because the fluid has air and or water in it and is old. Brake fluid is hydroscopic meaning it absorbs water. Brake fluid is designed to discolour as it gets oldler and as it absorbs more water.
When you bleed your brakes, you have a jar with a quarter full of good brake fluid. You attach one end of a length of PVC tube to your bleed screw and the other end is immersed in the brake fluid in the jar. This way when you are pumping your brakes and expelling the old fluid the up stroke of the brake pedal would allow air back in to the system if the tube wasn't inserted in the fluid.
Now for a couple of remedies: There is a product called visi bleed. You attach one end to your bleed screw, and the other end has a one way valve that does not allow fluid back in, only out.
Or you could get a product called a quick bleeder. It is a bleed screw that replaces your standard screw, that way you only have to place a tube over the screw and undo the screw by about 1/4 of a turn and pump the pedal as normal it will only allow fluid out but not in.
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