Brakes Impo

8/12/2019 Brakes Impo

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AUTOMOTIVE BRAKING SYSTAUTOMOTIVE BRAKING SYST
http://www.hunter.com/pub/undercar/index.htmhttp://www.hunter.com/pub/undercar/index.htmhttp://www.hunter.com/pub/undercar/index.htm


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How it WorksHow it Works

Friction develops heat which

absorbs kinetic energy of thecar


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PURPOSE OF BRAKINGPURPOSE OF BRAKING

SYSTEMSYSTEMStop the vehicle by converting the kinetic energy ofthe 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.isc and drum brakes are the most common type of

braking systems used.


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Factors Effecting Braking* Factors Effectin

g Braking*

"umber of wheels braking.#eight of vehicle.

$ype of friction material.Surface area of frictionmaterial.

Si%e or discs or drums

$ire traction.&oad surface.

'oad transfer.(ncline or decline of road.)gravity*

+ngine braking.,ressure applied


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Types of Braking SystemsTypes of Braking Systems

Service brakes . (t sthe primary braking

system using a the pedal connected to ahydraulic systemcausing it to operate.

Parking brakes . (t smechanically applied

by a lever or pedal.


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BASIC PARTSBASIC PARTS

,edal assemblyHydraulic system,ower booster isc brakeassemblyrum brake

assembly


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DISC BRAKESDISC BRAKES

isc brakes use arotating disc withtwo stationary

friction pads that are pressed against torotor by the caliperto create friction andheat.isc brakes aremore effective atdissipating heat.


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Disc Brake Rotor Disc Brake Rotor Rotor Rotor

PadsPadsCaliper Caliper PistonPistonBrakeBrakeLineLineBleederBleederscrewscrewThroughThroughBoltsBolts


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RotorsRotors


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Caliper Caliper 4oot,istonSeal

5aliperHousing4leed Screw6-&ing4ushing4olts


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Caliper* Cal iper*


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Disc Brake PadsDisc Brake Pads

7sbestos8etallic

Semi-8etallic6rganic


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Wheel ssem!lyWheel ssem!ly


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Disc Brake ssem!lyDisc Brake ssem!ly

kk


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Drum BrakesDrum Brakes


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Drum BrakesDrum Brakes


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Drum Brake ctionDrum Brake ctionAdjust by drivin in r!v!rs! "nd br"#inAd just by drivin in r!v!rs! "nd br"#in


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DRUM BRAKESDRUM BRAKES#heel 5ylinder

.4acking ,late

.Secondary 4rake Shoe

9pper &eturn Spring

,arking 4rake 'ever

,rimary 4rake Shoe

,iston

7d:uster

7nchor ,in

.'ower &eturn Spring


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Two Types of Drum BrakesTwo Types of Drum Brakes


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$YDRAU%IC SYSTEM$YDRAU%IC SYSTEM

4rake pedal assembly,ower booster

8aster cylinder ,roportioning valve8etering valve#arning light valve

'ines5alipers#heel cylinders


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Brake LightBrake LightHydraulic systemfails

,arking brake is on


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"aster Cylinder "aster Cylinder $he master cylinder displaces brake fluid under

pressure to brake system.#hen 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 pistonforward.forward movement of the pistons causes primarycups to cover bypass holes; hydraulic pressure

builds up and is transmitted to the wheel cylinders.


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" ST#R C$L%&D#R" ST#R C$L%&D#R

pedal retracts; the pistons allow fluid fromthe reservoir to fill the chamber

Special sensors within the master cylinderused to monitor level of fluid in reservoir;and alerts driver if pressure imbalancedevelops.standard dual master cylinder gives frontand rear brakes separate hydraulic systems.


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"aster Cylinder "aster Cylinder (f a brake fluid leak occurs in one system;the other system will still operate; making it

possible to. . .S$6, $H+ 57&


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Reser'oir Pro!lemsReser'oir Pro!lems


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Power Brake Booster Power Brake Booster G"in &'(!r )r'* v"+uu* in int"#! *"ni)',d


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BoosterBooster(peration(peration


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Brake LinesBrake Lines 4rake lines are steetubing with copperand lead coatings to

prevent rust andcorrosion. 7s the brake pedal isdepressed; it moves

pistons within themaster cylinder andforcing hydraulic

brake fluid


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Brake LinesBrake Lines

$hroughout the brakesystem and into the wheel)or brake* cylinders. $he pressure placed

upon this fluid causes thecylinder pistons to move; forcing the brakeshoes or friction pads and

brake drums or

rotors to slow thevehicle.


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Brake PartsBrake Parts


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Hydraulic )al'esHydraulic )al'es


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Hydraulic ction in the Caliper Hydraulic ction in the Caliper S=uee%e &otor ,ush out on rum


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Basics of HydraulicsBasics of Hydraulics

H d li i i h Wh l


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Hydraulic ction in the WheelHydraulic ction in the WheelCylinder Cylinder


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Braking )ideosBraking )ideos

http>[email protected]
http://www.raybestos.com/main.htm?techcenter.htmhttp://www.raybestos.com/main.htm?techcenter.htm


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PARKING BRAKEPARKING BRAKE

,arking brake pedal orlever

5ables7d:uster rum brake linkage

isc brake lever


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BRAKE INSPECTIONBRAKE INSPECTION

&emove all four wheels of the vehicle.6n drum brakes remove the drums andwash brake dust with proper cleaner.5heck brake pads and brakes shoes forwear.5heck drums and rotors for wear anddamage.


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Brake *luidBrake *luid'itmus test5olor

"on compressible&esists boiling

High Alowtemperature stability

"on-corrosive torubber partsHydroscopic B 7bsorbs water


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Brake *luidBrake *luid

6$ 36$!6$ B Silicone


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Brake Ser'iceBrake Ser'ice


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Pro!lemsPro!lems


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BSBS


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BS BSWheel locks up-

reduces power to thatwheel

,ulsates brakes if

sliding,ulsates brakes on hard

braking

Stops vehicle undercontrolNOT faster

Brakes Impo

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