2015 Porsche 718 Rear Wheel Drum Brake 380*32mm Cp9448 Caliper

Product Description

2015 Porsche 718 Rear Wheel Drum Brake 380*32mm Cp9448 Caliper

caliper brake
Caliper disc brakes have strong heat dissipation capacity and good thermal stability, so they are widely used in most cars and light trucks.
According to the structure of the brake caliper, the caliper disc brake can be divided into two types: fixed caliper disc type and floating caliper disc type.
Fixed caliper disc brake
The brake caliper of the fixed-caliper disc brake is fixedly installed on the axle, which can neither rotate nor move along the axis of the brake disc, so the brake pad actuating device must be installed on both sides of the brake disc (for example, Equivalent to the hydraulic cylinder of the wheel cylinder), in order to press the brake pads on both sides against the brake disc respectively.
Schematic diagram of the structure of the fixed caliper disc brake. The brake disc 1 is fixed on the hub, and the brake caliper 5 is fixed on the axle, which can neither rotate nor move axially along the brake disc. The brake caliper is equipped with two brake wheel cylinder pistons 2, which respectively press the brake blocks 3 on both sides of the brake disc. When the driver steps on the brake pedal to brake the car, the brake fluid from the brake master cylinder is pressed into the brake wheel cylinder, the hydraulic pressure of the brake wheel cylinder rises, and the pistons of the two wheel cylinders move to the brake wheel under the action of hydraulic pressure. The moving disc presses the brake pad against the brake disc, and the brake pad clamps the brake disc to generate a friction torque that prevents the rotation of the wheel to achieve braking.
The manufacturing process of the hydraulic cylinder in the fixed-caliper disc brake is similar to that of the general brake wheel cylinder, so this structure was adopted when the disc brake came out in the mid-1950s, and it was still popular until the end of the 1960s. However, this brake has the following disadvantages:
1) There are many hydraulic cylinders, which makes the structure of the brake caliper complex;
2) The hydraulic cylinders are placed on both sides of the brake disc and must be connected by the inner oil passage or the outer oil pipe of the caliper that spans the brake disc. This inevitably makes the size of the brake caliper too large to be installed in the rim of a modern car;
3) When the heat load is large, the brake fluid in the hydraulic cylinder (especially the outer hydraulic cylinder) and the oil pipe or oil passage across the brake disc is easily vaporized by heat;
4) If it is to be used as a parking brake, a mechanically actuated parking brake caliper must be installed.
4) If it is to be used as a parking brake, a mechanically actuated parking brake caliper must be installed.
These shortcomings make it difficult for fixed-caliper disc brakes to adapt to the requirements of modern automobiles, so since the 1970s, they have gradually given way to floating-caliper disc brakes.
Floating Caliper Disc Brakes
The caliper of a floating caliper disc brake is generally designed to slide axially relative to the disc. Among them, only the hydraulic cylinder is arranged on the inner side of the brake disc, and the outer brake pad is attached to the caliper body.
The brake caliper bracket is fixed on the steering knuckle, and the brake caliper body and the bracket can slide axially along the guide pin. When braking, the piston pushes the movable brake block (with the friction block wear alarm device) to the brake disc under the action of hydraulic pressure p. At the same time, the reaction force acting on the brake caliper body pushes the brake caliper The body moves to the right along the guide pin, so that the fixed brake block fixed on the brake caliper body is pressed against the brake disc. Therefore, the friction blocks on both sides of the brake disc clamp the brake disc under the action of the brake pad, so that the braking torque in the opposite direction of movement is generated on the brake disc, and the car is braked.
Contrary to the fixed-caliper disc brake, the single-side hydraulic cylinder structure of the floating-caliper disc brake does not need to span the oil passage of the brake disc, so not only the axial and radial dimensions are smaller, it may be arranged closer to the wheel hub, but also Brake fluid has less chance of vaporizing from heat.
In addition, the floating caliper disc brake does not need to add a parking brake caliper when it is also used as a service brake and a parking brake. It is only necessary to install some parking brakes near the hydraulic cylinder of the service brake caliper to push the piston of the hydraulic cylinder. Just move the mechanical transmission parts.

advantage
Compared with drum brakes, disc brakes have many advantages:
(1) The working surface of the disc brake is flat and heat transfer on both sides, the disc is easy to cool when rotating, and it is not easy to deform;
(2) There is no force-assisting effect, the brake performance is less affected by the friction coefficient, and the braking performance is relatively stable;
(3) The thermal expansion of the brake disc along the thickness direction is small, even if the brake disc expands due to high temperature after long-term use, the braking effect will be enhanced;
(4) Small size and quality;
(5) It is easy to realize the automatic adjustment of the gap, and the maintenance is simple;
(6) The efficiency decreases little after immersion in water, and it only needs one or two braking to return to normal.

FAQ
Q: How long the delivery time?
A: For sample, need 4-7 working days For quantity order, need 10-12 woking days
Q: Can the big brake kit be customized?
A: Yes, all of our big brake kits can be customized to meet the needs of different customers
Q: Can you make my own logo on the big brake kit?
A:Yes, we can make your own logo if needed, feel free to let us know when you'reready and we'l discuss the details
Q: Can your packaging be customized?
A: Whether it is inner packaging or outer carton, we can design it according to yourts
Q: How do you make our business long-term and good relationship?
A: 1.We keep good quality and competitive price to ensure our customers benefit
2. We respect every customer as our friend and we sincerely do business and make friends with them, no matter where they come from