2Friction develops heat which absorbs kinetic energy of the car How it WorksFriction develops heat which absorbs kinetic energy of the car
3PURPOSE OF BRAKING SYSTEM Stop the vehicle by converting the kinetic energy of the vehicle to heat energy.Heat energy is created in the brakes by friction.Friction is created between a moving and a non-moving surface at each wheel to generate the heat.Disc and drum brakes are the most common type of braking systems used.
4Factors Effecting Braking* Number of wheels braking.Weight of vehicle.Type of friction material.Surface area of friction material.Size or discs or drumsTire traction.Road surface.Load transfer.Incline or decline of road. (gravity)Engine braking.Pressure applied
5Types of Braking Systems Service brakes. It’s the primary braking system using a the pedal connected to a hydraulic system causing it to operate.Parking brakes. It’s mechanically applied by a lever or pedal.
6BASIC PARTS Pedal assembly Hydraulic system Power booster Disc brake assemblyDrum brake assemblyParking brakeBASIC PARTS
7DISC BRAKESDisc brakes use a rotating disc with two stationary friction pads that are pressed against to rotor by the caliper to create friction and heat.Disc brakes are more effective at dissipating heat.
8Disc Brake RotorRotor Pads Caliper Piston Brake Line Bleeder screw Through Bolts
22HYDRAULIC SYSTEM Brake pedal assembly Power booster Master cylinder Proportioning valveMetering valveWarning light valveLinesCalipersWheel cylinders
23Brake LightHydraulic system failsParking brake is on
24Master CylinderThe master cylinder displaces brake fluid under pressure to brake system.When brake pedal is depressed, push rod moves the primary piston forward in the cylinder.Hydraulic pressure created and the force of the primary piston spring moves the secondary piston forward.forward movement of the pistons causes primary cups to cover bypass holes, hydraulic pressure builds up and is transmitted to the wheel cylinders.
25MASTER CYLINDERpedal retracts, the pistons allow fluid from the reservoir to fill the chamberSpecial sensors within the master cylinder used to monitor level of fluid in reservoir, and alerts driver if pressure imbalance develops.standard dual master cylinder gives front and rear brakes separate hydraulic systems.
26Master CylinderIf a brake fluid leak occurs in one system, the other system will still operate, making it possible to. . .STOP THE CAR
27Master Cylinder Reservoirs Master Cylinder Vacuum Line To Front Brakes To Rear BrakesPowerBoosterBrake Pedal
32Brake LinesBrake lines are steel tubing with copper and lead coatings to prevent rust and corrosion. As the brake pedal is depressed, it moves pistons within the master cylinder and forcing hydraulic brake fluid
33Brake LinesThroughout the brake system and into the wheel (or brake) cylinders.The pressure placed upon this fluid causes the cylinder pistons tomove, forcing the brake shoes or friction pads and brake drums orrotors to slow the vehicle.
40PARKING BRAKE Parking brake pedal or lever Cables Adjuster Drum brake linkageDisc brake lever
41BRAKE INSPECTION Remove all four wheels of the vehicle. On drum brakes remove the drums and wash brake dust with proper cleaner.Check brake pads and brakes shoes for wear.Check drums and rotors for wear and damage.
42Brake Fluid Litmus test Color Non compressible Resists boiling High &low temperature stabilityNon-corrosive to rubber partsHydroscopicAbsorbs water