What are the causes of valve seat looseness

Some drivers want to replace or enlarge the brake disc, or replace the brake calipers, because of the importance of their own safety. There are also those who will add braking by replacing the more powerful calipers, such as the four-piston calipers, because the hydraulic pistons are so powerful that if the disc and brake tubing are not reinforced, under tight braking or long-term use, the disc and tubing may be subjected to too much kneading force and break. Of course, the excellence of the brake is not only to see its braking ability, because only increase the diameter of the brake disc will be able to produce a large brake (torque) . The real outstanding brake function is now the table brake system of heat storage and heat dissipation ability, because after many times after a series of intense braking system will overheat, in the large braking force is also missing. On the road, there is little time to put on the brakes, but those who have been on the track must have tried the smell of brake failure due to overheating. The more pistons the brake calipers have, the larger the caliber of the feces that require more brake fluid to propel them. If the total brake capacity and diameter did not do the corresponding increase, the brake pedal stroke and feel will be affected. Generally speaking, Four-piston calipers have been able to meet the needs of most of the modified cars, six pistons or more, it is necessary to carefully study the brake pedal journey.