![]() A fixed caliper may have 2, 4, 6 or 8 pistons depending on the requirement of the vehicle. They are directed in to caliper halves with sealed O-rings. ![]() In fixed caliper the brake fluid is routed through crossover lines or steel tubing which is placed outside the caliper housing. The fixed caliper mechanism creates equal pressure from each side. Ultimately, the brake pads stick to the brake disc/rotor and create friction which stops the brake disc/rotor from moving. When the brake lever is pressed, hydraulic pressure pushes both the pistons which in turn pushes both the brake pads towards the brake disc. So it, generally, has combination of two pistons and two brake pads. The fixed caliper has pistons on both the side. It is rigidly mounted to the steering knuckle. The fixed caliper requires a fixed mounting adapter. Informative: How Drum Brake Works? Explained with PicsĪs the name suggests a fixed caliper does not move with the rotation of the brake disc/rotor. It has problem of sticking due to dirt and corrosion.It can boil up the brake fluid in case of overheating of the disc.It is lesser stiffer than fixed caliper.It has lesser life and durability compared to fixed piston caliper.It requires higher amount of brake fluid due to the diameter of piston.Some loss of brake torque due to sliding of rotor.It require more pressure for clamping the disc than fixed caliper piston.Long Stroke and Short Stroke Engines – Explained in Simple Terms Floating Caliper Disadvantages The other advantage is that the floating caliper can better dissipate heat due to sliding nature and therefore less chances of brake fade.A heavy weight stops the disc faster than light weight. It is generally made of cast iron or steel which in turn increases weight and heat compared to the aluminum fixed caliper.It is easier to bleed floating caliper compared to fixed caliper.It requires less parts compared to fixed caliper.INFORMATIVE: How Motorcycle Tyres Are Manufactured? Floating Caliper Advantages Floating caliper can use 1, 2 or 3 pistons. The other noticeable difference in floating caliper is that the brake fluid directly goes in to the caliper via hydraulic passage inside the caliper. In this way the caliper creates friction from both the sides on the brake disc/rotor. When a brake lever is pressed, hydraulic pressure forces piston towards the inner brake pad which in turns pushes the inner brake pad towards the brake disc/rotor.Īt this moment the reaction force pushes caliper body towards the outer brake pad. ![]() It works on the Newton’s third low of motion – “To every action there is always an equal and opposite reaction”. The location of piston is just behind the inner brake pad. So the floating caliper always has a combination of one piston two brake pads. The floating caliper has a piston on only one side. As the name suggests a floating caliper moves in a path within its support with respect to the movement of brake disc/rotor. ![]()
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