One key to good brakes is surprisingly small: the brake bleeder screw.

1. What is a brake bleeder screw?

A brake bleeder screw is as it sounds — a screw that enables bleeding. Its threads are tapered to fit snugly into the caliper, preventing fluid from bypassing it to get to the outside. The head is built to fit perfectly into a machined nook within the caliper, so that when tightened, the surfaces mate and fluid can’t escape. However, the screw is hollow with a small hole in the head, so that when it’s loosened, fluid and air make their way in through the screw, exiting the top. Because air naturally rises to the top of the fluid in the caliper (or is forced there via compression), loosening the screw first purges the system of air, followed by fluid.

2.How does the bleed screw work?

1. You will loosen the air screw and let the fluid out, you should see some air bubbles or fluid spit out as you do this. Once the resting hawker is pressed all the way to the floor, you won't see the liquid coming out. Then close the bleed screw.

2.Check the reservoir. Make sure it's always topped up at the minimum fill line. Not doing this will suck more air into the system!

3. Repeat the process

(You will continue this process until you have a clean flow of fluid and no air bubbles in the drain screw.)

4. Tighten the vent screw and move on to the next one.

3.Why do customers often say that there is no pressure after receiving our goods

Case:

This is feedback from one of our customers. After receiving the goods and checking the brake wheel cylinder, the feedback problem is that the product has no pressure, and the aluminum piston will be better than the iron one, but is this really the case?

My answer:

No, it's not like that, 99% of the reasons why all the products have no pressure is because the air in the cylinder is not exhausted.

Our service standard:

1. Respond to quotations in a timely manner

2. not run away from problems

Please watch the following video about the inspection of the wheel cylinder:

Look the first paragraph, we put the air release screw in a loose state, Its pressure is not enough, it keeps beating; look at the second paragraph, we tighten it, it has enough pressure

4.Without testing equipment, how can I detect whether the wheel cylinder is under pressure?

1.First Tighten the screws 

2.then squeeze both sides inward, and then press the oil outlet with your fingers. 

(If there is no rebound, it means the pressure is sufficient; if the rebound is rapid, the pressure is insufficient.)

Please see the video below for details:

Therefore, such a small and inconspicuous accessory does have a great effect

When you feel that your wheel cylinder has no pressure, you can try my method to solve it