Brakes Ppts Rahul Sharma

7/31/2019 Brakes Ppts Rahul Sharma

1/20

MINI BAJA

BRAKES


2/20

BRAKES


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4/20

BRAKES

Friction betweenDrums & Shoes or Pads & Rotors slows the car.

Friction between TIRES and ROAD stops the car.


5/20

BRAKESAir Brakes. (Pneumatic)

Hydraulic Brakes use hydraulic fluid pressure to transmit power.(Incompressible)

Two pistons of same size will travel the same distance, with the

same force.

If the small piston acts on a large piston,

the large piston will travel with more

force, but a shorter distance.

If the larger piston acts on a small piston, the small piston will

travel a longer distance, but with less force.


6/20

BRAKESBrake Action

BrakePedalis connected to theMaster Cylinder.

Each wheel has a brakeDrum

(Rear)OrDisk

(Front)

Each wheel has a Wheel cylinder

(Rear)

Or Caliper

(Front)

Each wheel has Shoes

(Rear)

OrPads

(Front)
http://images.google.com/imgres?imgurl=http://www.automotive-technology.com/contractor_images/hipad/bp1.jpg&imgrefurl=http://www.automotive-technology.com/contractors/brakes/hipad/hipad1.html&h=237&w=390&sz=45&hl=en&start=4&tbnid=keTEHYf44BQxFM:&tbnh=75&tbnw=123&prev=/images%3Fq%3Dbrake%2Bpads%26svnum%3D10%26hl%3Den%26lr%3D%26rls%3DRNWE,RNWE:2005-31,RNWE:en%26sa%3DNhttp://images.google.com/imgres?imgurl=http://www.g503.com/images/old-parts-page/brake-shoes.jpg&imgrefurl=http://www.g503.com/parts/&h=489&w=450&sz=46&hl=en&start=10&tbnid=E3PaPRKaLO70OM:&tbnh=130&tbnw=120&prev=/images%3Fq%3Dbrake%2Bshoes%26svnum%3D10%26hl%3Den%26lr%3D%26rls%3DRNWE,RNWE:2005-31,RNWE:en%26sa%3DNhttp://images.google.com/imgres?imgurl=http://www.makino.com/sharedgfx/turnkey/pm0032-11.jpg&imgrefurl=http://www.makino.com/industries/parts_production/turnkey_solutions/study.aspx%3Fid%3D42&h=280&w=350&sz=15&hl=en&start=7&tbnid=0qYJueXl1dToLM:&tbnh=96&tbnw=120&prev=/images%3Fq%3Dbrake%2Bcaliper%26svnum%3D10%26hl%3Den%26lr%3D%26rls%3DRNWE,RNWE:2005-31,RNWE:enhttp://images.google.com/imgres?imgurl=http://www.mustangproject.com/Images/Products/C7ZZ-2262-AR.jpg&imgrefurl=http://www.mustangproject.com/Catalog.aspx%3Fcategory%3D6165ba1a-6368-4ae8-82ca-175912f4f559%26sub%3D8821fba0-d663-4187-9f65-d25b4e2d1403&h=240&w=310&sz=21&hl=en&start=6&tbnid=jiogPu7r2aWaWM:&tbnh=91&tbnw=117&prev=/images%3Fq%3Dwheel%2Bcylinder%26svnum%3D10%26hl%3Den%26lr%3D%26rls%3DRNWE,RNWE:2005-31,RNWE:en%26sa%3DNhttp://images.google.com/imgres?imgurl=http://www.teamgvr.com/siteimages/brake-disk.jpg&imgrefurl=http://www.teamgvr.com/competition.cfm&h=479&w=512&sz=15&hl=en&start=1&tbnid=LMdR7BUVd78cgM:&tbnh=123&tbnw=131&prev=/images%3Fq%3Dbrake%2Bdisk%26svnum%3D10%26hl%3Den%26lr%3D%26rls%3DRNWE,RNWE:2005-31,RNWE:en%26sa%3DNhttp://www.cdxetextbook.com/images/350px-Brkpedalleverage.jpg


7/20

BRAKESBrake Action

When the Brake pedal is pressed, brake fluid travels from Master

cylinder to the Caliper or Wheel cylinder, pushing the pistons out.

In turn this action pushes the shoes against the drum or

the pads against the rotor.


8/20

BRAKES

70% - 80% of the work is done by the front brakes

When the vehicle comes to a stop, most of the weight is shiftedto the front


9/20

BRAKESBrake Lining

Brake lining is made of various materials (Asbestos)

Some are bonded or glued to a metal plate.

Some are riveted to a metal plate.

Brake lining must be strong enough to absorb the heat and last

a long time, yet save the drums and rotors from wearing too quickly.
http://www.automotive-technology.com/contractor_images/hipad/bp1.jpghttp://images.google.com/imgres?imgurl=http://www.g503.com/images/old-parts-page/brake-shoes.jpg&imgrefurl=http://www.g503.com/parts/&h=489&w=450&sz=46&hl=en&start=10&tbnid=E3PaPRKaLO70OM:&tbnh=130&tbnw=120&prev=/images%3Fq%3D%2B%2Bbrake%2Bshoes%26svnum%3D10%26hl%3Den%26lr%3D%26rls%3DRNWE,RNWE:2005-31,RNWE:enhttp://images.google.com/imgres?imgurl=http://www.buggiesunlimited.com/Merchant2/graphics/00000001/BU4254_brake_shoes.jpg&imgrefurl=http://www.buggiesunlimited.com/Merchant2/merchant.mvc%3FScreen%3DPROD%26Product_Code%3DBRKML4254&h=299&w=350&sz=11&hl=en&start=2&tbnid=k7JYLMWbdkd7QM:&tbnh=103&tbnw=120&prev=/images%3Fq%3D%2B%2Bbrake%2Bshoes%26svnum%3D10%26hl%3Den%26lr%3D%26rls%3DRNWE,RNWE:2005-31,RNWE:enhttp://images.google.com/imgres?imgurl=http://www.virtualgaz.co.uk/updateoct04/ltd/Brakes/front%2520pads.JPG&imgrefurl=http://www.virtualgaz.co.uk/updateoct02/LTDpage.htm&h=480&w=640&sz=77&hl=en&start=16&tbnid=tqTkNuaWQm_1aM:&tbnh=103&tbnw=137&prev=/images%3Fq%3D%2Bbrake%2Bpad%26ndsp%3D20%26svnum%3D10%26hl%3Den%26lr%3D%26rls%3DRNWE,RNWE:2005-31,RNWE:en%26sa%3DNhttp://www.automotive-technology.com/contractor_images/hipad/bp1.jpg


10/20

The vehicle must have at least two independent hydraulic braking

systems that act on all wheels and is operated by single foot. The

pedal must actuate the master cylinder I.e. no cables are allowed.

Each hydraulic system have its own fluid reserve either throughseparate reservoirs.

The brake system have capable of locking all 4 wheels in static

condition and dynamically on pavement and an unpaved

surface.Both the independent brake systems may be actuated by atandem master cylinder.


11/20

BRAKESDisk brakes found on front of most vehicles as well as at rear

of four wheel Disk brakes vehicles.

Has a rotor/disk between two pads

Caliper squeezes the pads against

the disk when the brakes are applied

Disk brakes work much better then

the drum brakes, as they cool better

and apply more pressure.

CHOICES

Metallic(last longer, but bad for rotor)

Semi-metallic

Ceramic


12/20

BRAKES

Wear Sensors

Some pads have wear warning sensors.

Squeals without stepping on the brakes.

Replace when the pad is down to 1/8 at any point.
http://img.alibaba.com/photo/11277405/Kia_Pride_Brake_Pad.jpg


13/20

BRAKES

Rear brakes are self adjusting.

They adjust when the vehicle is

reversed and brakes are applied.

Can be manually adjusted by

turning the star-wheel.

Primary shoe sits at the front (smaller/thinner),and secondary shoe sits towards the rear

(bigger/thicker).

Replace shoes when they are down to 1/16 at any point.


14/20

BRAKESParking brakes are part of the rear brakes and are operated

mechanically with the help of a leaver and cables.


15/20

BRAKESMaster Cylinder

Reservoir for brake fluid.

Connected to the brake pedal.

Pressurizes the system when

brakes are applied.

PROBLEMS

Internal leakPedal slowly goes down to the floor when stopped at a

red light. (No visible leak)

External leakBetween Master cylinder and power booster.

Cheaper to replace.

Bench bleed when installing

new.


16/20

BRAKESDual Brake system

Is a safety feature. If one system fails the other will still work.Front brakes are on different lines then the rear.

Master cylinder has two compartments for brake fluid.

Bigger for front and smaller for rear.


17/20

BRAKESCombination Valve

Pressure Differential Switch, Proportioning Valve & Metering Valve

are all combined in one.


18/20

BRAKESBrake Fluid

Use the one recommended by the manufacturer.

DOT3

DOT4

DOT5

Properties

High Boiling point

Water Tolerance

Low Freezing Point

Non-corrosive (rubber, plastic, metal).

Brake parts can be cleanedwith brake fluid.

Lid should be always covered in order to prevent moisture in the

system.


19/20

BRAKESProblems

Loss of brake pedal

Master cylinder

Leak in the system


20/20

BRAKESProblems

One rear wheel locks up

Adjustment

Oil on the brake lining

Seized brake cable

Pull to one side

Seized brake caliperBlocked brake line

Bad tires (alignment)

Brakes Ppts Rahul Sharma

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