The working principle of the brake is mainly from friction. The friction between the brake pad (to make the pad) and the disc is used to convert the kinetic energy of the bicycle into the heat energy after friction and stop the bicycle. With the use of disc brakes on mountain bikes, the inner pads will inevitably wear out. When the braking force is insufficient or the piston is observed to have pushed out a certain distance, the pads need to be replaced when they are worn to the bottom. , Today, Trifox brings you the method of replacing the original film by yourself.
First remove the wheel set, use needle nose pliers to straighten the latch on the brake until it is parallel and can be pulled out smoothly.
After the latch is pulled out, take out the two straps together with the shrapnel. Wipe dirt and stains out of the calipers.
The pads are made by mixing various fillers and binders under high temperature and high pressure. According to the different fillers, they are divided into resin pads and metal pads. I use resin pads with low noise. , the disc wear is small, but its own wear is fast. Comparing the old and new pads, it can be seen with the naked eye that the old pads have been worn off a lot.
After pulling out the refill, it can be seen that as the refill becomes thinner, the hydraulic oil pushes out the ceramic piston to compensate, and the gap becomes very small. At this time, the protruding piston needs to be returned to install the new refill. piece.
Find a slender strip, you can have a hexagon socket or a tire stick on hand, pass it through the caliper, hold both ends with force at the same time, press the protruding piston back inward, be careful not to use too much force or use The sharp object is hard and warped, and it is easy to perform miracles with strong force, and it will pry the piston to pieces. In the process of replacement, you should also pay attention not to squeeze the brakes in the air, because the piston stroke is too long, which will cause oil leakage.
After the two ends are pressed back, take out the new shrapnel, put them on both ends of the shrapnel, and put them back into the calipers to align with the holes
Pass the pin through the hole and bend the pin with needle nose pliers to limit the position of the pad.
Put the wheel back together, and lightly squeeze the brake several times to return the piston.
Rotate the wheel to check for signs of disc rubbing and make adjustments to complete the pad replacement. The braking force is restored, and the downhill is more confident.