AUTOMOTIVE BRAKING SYSTEMS www.engineersportal.in

Friction develops heat which absorbs kinetic energy of the car How it Works Friction develops heat which absorbs kinetic energy of the car www.engineersportal.in

PURPOSE 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. www.engineersportal.in

Factors Effecting Braking* Number of wheels braking. Weight of vehicle. Type of friction material. Surface area of friction material. Size or discs or drums Tire traction. Road surface. Load transfer. Incline or decline of road. (gravity) Engine braking. Pressure applied www.engineersportal.in

Types 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. www.engineersportal.in

BASIC PARTS Pedal assembly Hydraulic system Power booster Disc brake assembly Drum brake assembly Parking brake BASIC PARTS www.engineersportal.in

DISC BRAKES Disc 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. www.engineersportal.in

Disc Brake Rotor Rotor Pads Caliper Piston Brake Line Bleeder screw Through Bolts www.engineersportal.in

Caliper Boot Piston Seal Caliper Housing Bleed Screw O-Ring Bushing Bolts www.engineersportal.in

Caliper* www.engineersportal.in

Disc Brake Pads Asbestos Metallic Semi-Metallic Organic www.engineersportal.in

Disc Brake Assembly www.engineersportal.in

Drum Brakes www.engineersportal.in

Brake Light Hydraulic system fails Parking brake is on www.engineersportal.in

Master Cylinder The 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. www.engineersportal.in

MASTER CYLINDER pedal retracts, the pistons allow fluid from the reservoir to fill the chamber Special 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. www.engineersportal.in

Master Cylinder If a brake fluid leak occurs in one system, the other system will still operate, making it possible to. . . STOP THE CAR www.engineersportal.in

Master Cylinder Reservoirs Master Cylinder Vacuum Line To Front Brakes To Rear Brakes Power Booster Brake Pedal www.engineersportal.in

Brake Parts www.engineersportal.in

Basics of Hydraulics www.engineersportal.in

BRAKE 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. www.engineersportal.in

Brake Fluid Litmus test Color Non compressible Resists boiling High &low temperature stability Non-corrosive to rubber parts Hydroscopic Absorbs water www.engineersportal.in

Brake Service Visual Inspection Measure Resurface Repair Recondition Bleed Test www.engineersportal.in

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