Slide Brake_System training potx

Brake BoosterGeneral & Construction 12 Constant pressure chamber 5 Diaphragm 3 Booster piston 7 Valve body8 Reaction disc 1.General/ 2.Construction 13 Check valveVacuum Brake master cyl

(7) Fluid level sensor

(6) Reservoir tank

(1) No.1 piston(2) No.1 return spring

(3) No.2 piston(4) No.2 return spring

F1× A = F2× B ∴ F2 = F1×

F1: Pedal force

F2: Push rod output force

A1: Distance from center of brake pedal

to fulcrumB: Distance from push rod to fulcrumOperating force:

Push rodb

= ∴a = b × ∴b = a ×

Master Cylinder

General & Construction

4.Types of brake lines

Front

FR vehicle

FF vehicle

Front

to Rear sideNo.2 piston

Compensating portInlet portNo.1 piston

No.1 piston cupStopper bolt

No.2 piston cup

Master Cylinder

Operation

Brake pedal depressed (1)

to Front side to Rear side

Master Cylinder

Operation

Brake pedal released (1)

to Front side to Rear side

Inlet port

Piston cup

Compensating portOrifices

Brake pedal released (2)

Master Cylinder

Operation

to Front side to Rear side

No.1 pistonContact

No.2 piston

Master Cylinder

Operation

to Front side to Rear side

No.1 pistonPiston contacts wall

No.2 piston

Brake Booster

General & Construction

(12) Constant pressure chamber

(5) Diaphragm

(3) Booster piston

(7) Valve body(8) Reaction disc

1.General/

2.Construction

(13) Check valveVacuum

Brake master cylinder

(10) Body seal(2) Push rod(4) Booster body

(6) Diaphragm spring

(11) Variable pressure chamber

Air

(1) Valve operating rod

(9) Air cleaner(10) Body seal

Brake Booster

Operation

Booster pistonControl valve

Diaphragm spring

Vacuum valve (opened)Piston

1.Brakes not applied

Valve operating rod

Variable pressure chamber

Constant pressure chamber

Air valve (closed)

Variable pressure chamber Passage B

Air valve return spring Air cleaner element

Control valveControl valve spring

Valve operating

Constant pressure chamber

Valve bodyPassage A

Brake Booster

Operation

Booster pistonControl valve

Piston

2.Brakes applied

Valve operating rod

Variable pressure chamber

Constant pressure chamber

Air valve (opened)

Variable pressure chamber

Control valve spring

Air cleaner element

Control valveControl valve spring

Valve operating rod

Constant pressure chamber

Control valvePassage A Vacuum valve (closed)

Passage BAir valve

(closed)

Air

Passage B

Booster push rod

Diaphragm spring

Brake Booster

Operation

Booster pistonControl valve

Piston

3.Holding state

Valve operating rod

Variable pressure chamber

Constant pressure chamber

Variable pressure chamber

Control valve spring

Valve operating rod

Constant pressure chamber

Control valve

Diaphragm spring

Vacuum valve

Air valve (closed)

Stopped

Brake Booster

Operation

Booster pistonControl valve

Piston

4.Maximum boost

Valve operating rod

Variable pressure chamber

Constant pressure chamber

Variable pressure chamber

Control valve spring

Valve operating rod

Constant pressure chamber

Control valve

Diaphragm spring

Vacuum valve

Air valve (opened)

Booster push rod

Air

Brake Booster

Operation

Booster pistonControl valve

Constant pressure chamber

Variable pressure chamber

Valve body

Valve operating rod

Constant pressure chamber

Valve stopper keyReaction disc

80 N(to Valve body)

Booster push rod

100 N

1cm2 (20N)4cm2 (80N)

Brake Booster

Gap Adjustment of Push Rod

Choke appliedSST

Thickness gauge

BRAKE BOOSTER ADJUSTMENT

•Thickness Gauge(0.2mm or 0.008inch) and Special Service Tool(SST 09737- 00010)are required to check and adjust the push rod length.

• See Repair Manual for details.

Accessory toolSST

STT 09737-00010

Brake Booster

Function Check

Airtightness function cheek

to Intake manifold

Atmospheric pressure

Atmospheric pressure

Operating cheek

to Intake manifoldAtmospheric pressure

Vacuum

to Intake manifoldAtmospheric pressure

Vacuum tightness function cheek

Vacuum

Brake Booster

Function Check

Airtightness function cheek

to Intake manifold

Atmospheric pressure

Atmospheric pressure

Operating cheek

to Intake manifoldAtmospheric pressure

Vacuum

to Intake manifoldAtmospheric pressure

Vacuum tightness function cheek

Vacuum

1.Airtightness function

check

Brake Booster

Function Check

Airtightness function cheek

to Intake manifold

Atmospheric pressure

Atmospheric pressure

Operating cheek

to Intake manifoldAtmospheric pressure

Vacuum

to Intake manifoldAtmospheric pressure

Vacuum tightness function cheek

Vacuum

2.Operation check

Brake Booster

Function Check

Airtightness function cheek

to Intake manifold

Atmospheric pressure

Atmospheric pressure

Operating cheek

to Intake manifoldAtmospheric pressure

Vacuum

to Intake manifoldAtmospheric pressure

Vacuum tightness function cheek

Vacuum

3.Load airtightness

function check

Proportioning Valve

General & Construction

(a) Desired curve-line

of braking force Rear

wheel braking fore

(2) Piston (1) Valve body

(3) Valve seal Front

Proportioning Valve

Operation

Split point Master cylinder pressure Master cylinder

hydraulic pressure

Spring

Master cylinder hydraulic pressure Force by the difference in the pressure reception surface area

to Rear wheel cylinders

hydraulic pressure

Spring

Master cylinder hydraulic pressure Force by the difference in the pressure reception surface area

to Rear wheel cylinders

hydraulic pressure

Spring

Master cylinder hydraulic pressure Force by the difference in the pressure reception surface area

to Rear wheel cylinders

Front Front

Piston Cylinder cup

Piston LSPV

Valve seal

Valve body Extends

During operation

(5) Fluid (1) Disc brake caliper

(3) Disc brake rotor

(2) Disc brake pad

Disc brake caliper

Piston seal returns piston by amount of its deformation.

Clearance

deformation Piston

Brakes released

After pad wear

Foot Brake

Disc Brake

5.Pad wear indicator

Direction of disc brake rotor rotation

Anti-squeal shim Disc brake pad

Pad wear indicator

Pad wear indicator

Backing plate

Inner pad Pad wear

indicator

to ECU

Clip

Pad wear indicator

Torque plate Disc brake rotor

Hydraulic pressure

Pin

Inner pad Pin

Torque plate

Disc brake caliper

Steering knuckle (Fixed)

Bolt

PD type

Torque plate

Disc brake caliper Bolt Torque plate

(4) Return spring

(5) Brake drum

Wheel cylinder Direction of drum

rotation

Leading shoe

Trailing shoe

Duo-servo type Uni-servo type

Fixed wheel cylinder

Adjusting cylinder

Leading shoe Trailing shoe

Duo-servo type Uni-servo type

Fixed wheel cylinder

Adjusting cylinder

Leading shoe Trailing shoe

Foot Brake

Drum Brake

Adjust leverGap is larger

AdjustorBrake shoe

The adjust lever turns the adjustor

Foot Brake

Drum Brake

ContractExpand

Parking Brake

Types of Parking Brake Lever

Release lever

LockRelease

Disc brake pad

Disc brake type

Devoted parking brake type Center brake type

Parking brake cable

Shoe lever

Brake shoeDisc brake pad

Brake shoe

Disc brake pad

Disc brake type

Devoted parking brake type Center brake type

Parking brake cable

Shoe lever

Brake shoeDisc brake pad

Brake shoe

1.Foot brake sharing type

Disc brake pad

Disc brake type

Devoted parking brake type Center brake type

Parking brake cable

Shoe lever

Brake shoeDisc brake pad

Brake shoe

2.Devoted parking

brake type

Disc brake pad

Disc brake type

Devoted parking brake type Center brake type

Parking brake cable

Shoe lever

Brake shoeDisc brake pad

Brake shoe

3.Center brake type

Intake manifold No.2 pistonNo.1 piston

Air

Variable pressure chamberConstant pressure chamber

Foot Brake

Brake Pedal Height Adjustment

Adjusting pointLock nut

Push rod

Pedal height Pedal freeplay

Lock nut

Stick type

Adjusting nut

Lock nut