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Edit Comment Close Premium member Presentation Transcript Slide 1: Brakes Types : Types Parking Brake Service Brake Hydraulic Disc Brakes Drum Brakes Dual System Antilock Brake System (ABS) Play Principles of Braking : Play Principles of Braking Brake System Principles : Brake System Principles Kinetic Energy Mass Weight Speed Inertia and Momentum Coefficient of Friction Video : Coefficient of Friction Video Parking Brake : Parking Brake Not an “Emergency” Brake Used specifically to keep a parked vehicle from moving Usually on rear wheels only Mechanically operated Static Friction: at rest friction- More friction Kinetic Friction: in motion friction- less friction Typical Parking Brake : Typical Parking Brake Play Parking Break Video : Play Parking Break Video Play Parking Brake Adjustment Video : Play Parking Brake Adjustment Video Service Brakes : Service Brakes Primary Braking System Should be stronger than the engine Hydraulic Operated Can be Vacuum, Hydro or Motor assisted Disc System Drum System Dual System Typical System : Typical System Hydraulic Principles : Hydraulic Principles Fluids cannot be compressed Fluids can transmit Movement Acts “Like a steel rod” in a closed container Master cylinder transmits fluid to wheel cylinder or caliper piston bore. Fluids can transmit and increase force Force Area Pressure Hydraulics : Hydraulics Simplified Hydraulic Brake System Drum Brake Master Cylinder Disk Brake Hydraulic pressure is distributed equally in all directions : Hydraulic pressure is distributed equally in all directions Same line pressure to all wheels : Same line pressure to all wheels The Hydraulic pressure is the same, but the applied force can be changed by the piston size : The Hydraulic pressure is the same, but the applied force can be changed by the piston size The applied pressure can be raised or lowered by piston size : The applied pressure can be raised or lowered by piston size Play Hydraulic Pressure Video : Play Hydraulic Pressure Video Brake Pedal DesignAdvantage by Leverage : Brake Pedal DesignAdvantage by Leverage First Mechanical Advantage is Driver’s foot Length of Lever determines force applied Uses Fulcrum Pedal Ratio 10 2 5:1 2.5 inches 5 0.5 inch Play Break Pedal Leverage Video : Play Break Pedal Leverage Video System Basics : System Basics Hydraulic actuation allows multiplication of pedal force. In this system, a 10lb force on the pedal produces 360 lbs of force at the friction surface. Play Break Lines & Hose Video : Play Break Lines & Hose Video Brake Fluid : Brake Fluid Properties of Brake Fluid Does not thicken or then with changing heat Must not boil Must be compatible with brake parts material Must lubricate internal parts Must not evaporate easily Brake Fluid types : Brake Fluid types DOT 3 and 4- Polyglycol based Most common Compatible with one another Inexpensive Destroys paint Ruined by moister DOT= Department of Transportation High #= High stands, quality and boiling point DOT 5- Silicone Based Used only for heavy duty applications Not Compatible with 4&5 Very Expensive Does not damage paint Fluid Contaminates : Fluid Contaminates Moister- Lowers boiling point water boils @ 212*F DOT 3 boils @ 401*F Petroleum Based Product- soften rubber parts causing swelling Dirt & Debris- causes corrosion and clogs Air and Vapors- Compressible prevents pressure from reaching brakes Play Break Fluid Video : Play Break Fluid Video Master Cylinder : Master Cylinder Provides a reservoir for brake fluid and contains the driving pistons in the hydraulic circuit 2 Types Front - Rear split -One piston for front brakes and one for rear -If a leak occurs you could lose front brakes Diagonally split -One piston drives one front wheel and one rear wheel -Diagonal layout allows you to maintain directional control if a leak occurs Play Tandem Master Cylinder Video : Play Tandem Master Cylinder Video Play Divide System Video : Play Divide System Video Power Booster in closed position : Power Booster in closed position Play Power Booster Video : Play Power Booster Video Drum Brakes : Drum Brakes Expanding shoes create force on the inner surface of the drum Used on the rear of some trucks and SUV’s Self-energizing design requires less activation force Require periodic adjustment Drum Brake System : Drum Brake System Vented Rotors : Vented Rotors Vented Rotors have Fins in the spaces between their machined surfaces. These spaces allow air to pass through, which helps carry heat away. Nonvented Rotor : Nonvented Rotor Non Vented Rotors are used on smaller vehicles, and have no cooling fins Play Brake Disc Video : Play Brake Disc Video Disc Brake Caliper Assembly : Disc Brake Caliper Assembly Caliper Types : Caliper Types There are 2 types of Calipers Fixed Calipers are disc brakes that use a caliper that is FIXED in position and does not slide. They have pistons on both sides of the disc. There may be 2 or 4 pistons per caliper Floating Much more common Single Piston Easier to work with On “inboard” side of caliper Fixed Caliper : Fixed Caliper Motorcycles and some import trucks and cars use this type Similar to bicycle brakes Sliding Caliper : Sliding Caliper Applies pressure to two pads on opposite sides of rotor Caliper Sliding Fixed Friction Material exposed to air Fixed Caliper : Fixed Caliper Applies two pistons to opposite sides of rotor Caliper stays stationary Disc Brakes require higher hydraulic pressure Play Disc Brake Calipers Video : Play Disc Brake Calipers Video Diagnosis : Diagnosis Several different types of Complaints Noise Pulsation Pedal travel More later… Brake Noise : Brake Noise Wear Indicator Brake Pulsation : Brake Pulsation Usually a warped Rotor Rotor needs trued on a brake lathe Pedal Travel : Pedal Travel NO BRAKES!!!! Excessive pedal travel Pedal feels soft and squishy Requires excessive effort to stop vehicle or my cause brakes to not function at all Play Drum Brake Inspection Video : Play Drum Brake Inspection Video Play Disc Brake Inspection Video : Play Disc Brake Inspection Video Anti-Lock Brakes : Anti-Lock Brakes A locked (sliding) wheel offers less braking force than a decelerating rolling wheel The locked wheel also produces little lateral force, preventing steering control Anti-Lock systems (ABS) monitor wheel lock-up and modulate brake pressure to provide controlled braking under most circumstances Play ABS Principles Video : Play ABS Principles Video Anti-Lock Brakes : Anti-Lock Brakes System can have 2, 3 or 4 channels Trucks typically use 3 channel with only one sensor for the rear axle Most modern cars use 4 channel system Wheel speed sensors monitor each wheel speed ABS controller and high-pressure pump increase or reduce pressure to wheels in order to maintain consistent wheel speeds Play ABS video : Play ABS video Play Drum, Disc, & ABS Video : Play Drum, Disc, & ABS Video Other Braking Systems : Other Braking Systems Air Brakes Exhaust Brakes Electric or Trailer Brake Play Disc Brake Replacement Video : Play Disc Brake Replacement Video Play Replacing The Rotor Video : Play Replacing The Rotor Video Play Drum Brake Replacement Video : Play Drum Brake Replacement Video You do not have the permission to view this presentation. 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