Brake Systems & Basic HydraulicsA History of Braking

How do you stop a Stage Coach?

No Matter the how you stop it!Friction – the resistance between two moving parts!

Is the Key!

Basic Hydraulics“Pascal's Law”

Pressure exerted upon a mass of liquid in a closed container, transmits that pressure in all directions!

100 lbs500 lbs

100 lbs 500 lbs500 lbs

3000 lbs

3000 lbs 3000 lbs

3000 lbs 3000 lbs

3000 lbs

Basic Hydraulics“Pascal's Law”

Transmits Motion Also!

½”½”

1” Diameter Each

2”

1” 1”

Volume down must equal volume up !Down Diameter 1” Up Diameters ½”Down Diameter 1” Up Diameter 2”

1”

½”

Pascal Law & Automotive Braking

Hydraulic Brake Components

Master Cylinder

Single CylinderMaster Cylinder Dual Cylinder

Master Cylinder

Pedal Pressure

Hydraulic Brake Components

Wheel CylinderProportioning Valve

Hydraulic Brake Components

Brake Caliper

Bleeding the HydraulicsWith a Pressure BleederManual Bleeding

“DOWN”“UP” “Open”“Close”

Remember toCheck fluid in Master Cylinder

No More Air Pockets“Repeat at other wheels”

Drum Brakes

Brake DrumBrake ShoesPrimary Shoe

Secondary ShoeWheel Cylinder

Brake Shoe RetainerReturn Springs

Anchor Pin

Drum Brakes

Manual AdjustingParking BrakeSelf Adjusting

Disk BrakesBasic Operation

Pressure exerted over a larger surface area per PSI means “BETTER BRAKING”

Caliper TypesDisk Brake Pads

Disk Brakes

Disk Brake Advantages

- better braking

- less parts

- easy replacement

- easy wear inspection

- better cooling

- no adjustment required

Disk Brake Disadvantages

- cost more, initial & replacement

- parking brake problems

- wet splash

Power Brakes

ABS BrakesAnti Lock Brake System

Brake Demo’s

- Replacing Brake Shoes

- Replacing Brake Pads

- Wheel Cylinder Honing

- Machining a Drum

- Machining a Rotor