Jekit 4 Pots Yellow Brake Caliper 360x28mm Dual Rear Caliper Kit

1. Double piston caliper is a kind of multi piston caliper;

2. The multi piston caliper is built on the fixed opposite cylinder. It has multiple pistons and most of them are placed opposite. The advantage of multiple pistons is that the caliper will be relatively large, so a larger brake skin can be placed to increase the friction.

3. In addition, because multiple pistons are used, and each piston is driven by brake fluid, the pressure applied to the brake skin increases at the same time. With a larger brake skin, the braking force can be increased naturally.

4. Although the multi piston caliper has strong braking force, its weight will also increase, which will affect the weight under suspension. 5. Some of the multi piston calipers are made of pistons with equal diameters, while others are made of pistons with different diameters. In this way, the pistons with different diameters can keep the calipers linear, retain a little comfort and have strong braking force.

Caliper knowledge

Calipers mainly use pistons to make the brake pads clamp the brake discs. Most ordinary cars use single pistons, while sports RV / performance vehicles will be upgraded to double pistons to provide better braking performance. More than 4 pistons are usually called "abalone". Typical examples are evolution and WRX STI. The internal main components of the caliper can be divided into piston, piston seal and dust boot. Ray Xiaobian will not mention other details. When working, the piston and caliper will rub against each other. When the plastic parts (seal) reach the life cycle, there will be the problem of hardening / insufficient sealing. When impurities are mixed into the interior, there will be rust. In the long run, the piston will not operate normally, and finally there will be the problem of blocking.

Once the piston is blocked, it means it can not operate normally. Firstly, it will reduce the braking efficiency. Secondly, because the piston can not complete the telescopic action, the piston is stuck, so that the brake pad can not return to its position, and forces the brake to rub with the brake disc all the time (this possibility is not ruled out). In the long run, it will lead to uneven running in of the brake disc and brake pad, and the cost of changing the disc and brake pad is not cheap, So next time you might as well ask the mechanic to check whether the piston works normally.

It is often repaired every 60000 km, but because few car owners require calipers to be repaired, most car manufacturers rarely provide such services, mainly because of more work and trouble. The process is roughly as follows: remove the caliper, remove the piston, clean, polish the rusty part of the piston, replace the piston seal and other oil traps, reinstall the caliper and piston, and finally eliminate the excess air inside the brake. You can also change the brake fluid.