TERM – 3^RD TERM

WEEK THREE

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject: AUTO MECHANICAL

Topic: BRAKING SYSTEM III

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

I.) Define mechanically operated brakes

II.) Define hydraulically Operated brakes

III.) Differentiate between mechanically and hydraulically Operated brakes

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION	TEACHER’S ACTIVITY	STUDENT’S ACTIVITY
STEP 1 INTRODUCTION	The teacher explains the meaning of mechanically and hydraulically Operated brakes	Students listens attentively to the teacher
STEP 2 EXPLANATION	Teacher explains the difference between mechanically and hydraulically Operated brakes	Students exhibit attentiveness and active engagement
STEP 3 NOTE TAKING	The teacher writes a summarized note on the board	The students copy the note in their books

NOTE

BRAKING SYSTEM III

Mechanically operated brakes

Mechanically operated brakes are braking systems that use purely mechanical means, such as cables, rods, or levers, to actuate the braking mechanism. These brakes rely on physical force applied by the driver to slow down or stop the vehicle.

One common example of mechanically operated brakes is the drum brake system found in many older vehicles. In a drum brake system, pressing the brake pedal activates a mechanical linkage that applies pressure to brake shoes inside a drum, creating friction and slowing down the vehicle.

Hydraulically Operated brakes

Hydraulically operated brakes are braking systems that use hydraulic fluid to transmit force from the brake pedal to the braking mechanism. These brakes rely on the principle of fluid pressure to amplify the force applied by the driver, providing efficient and responsive braking performance.

In a typical hydraulic brake system, when the brake pedal is pressed, it activates a piston in the master cylinder, which forces hydraulic fluid through brake lines to one or more pistons in the brake calipers or wheel cylinders. The pressure generated by the hydraulic fluid pushes brake pads against brake discs (in disc brakes) or brake shoes against brake drums (in drum brakes), creating friction and slowing down the vehicle.

Hydraulically operated brakes offer several advantages over mechanically operated brakes, including:

Enhanced Performance: Hydraulic brakes provide more precise control and greater stopping power compared to mechanical brakes, especially in high-performance or heavy-duty applications.
Consistent Braking: Hydraulic systems are less prone to wear and provide consistent braking performance over time, resulting in smoother and more reliable operation.
Reduced Effort: Hydraulic systems amplify the force applied by the driver, requiring less effort to achieve effective braking, which can reduce driver fatigue and improve comfort.
Faster Response: Hydraulic brakes respond more quickly to driver input, allowing for faster braking response and improved safety in emergency situations.

Features	Mechanically Operated Brakes	Hydraulically Operated Brakes
Operating Principle	Relies on mechanical linkage, such as cables or rods, to transmit force from the brake pedal to the braking mechanism.	Uses hydraulic fluid to transmit force from the brake pedal to the braking mechanism, amplifying the force applied by the driver.
System Complexity	Generally simpler in design and construction, with fewer components and moving parts	More complex system with additional components such as master cylinders, brake lines, and hydraulic pistons.
Performance	Offers adequate braking performance, but may lack the precision and responsiveness of hydraulic brakes.	Provides superior braking performance, with greater stopping power, improved control, and faster response times
Maintenance and Repair	Typically easier to maintain and repair due to their simpler design and mechanical components	May require more specialized maintenance and repair procedures due to the complexity of hydraulic components and fluid systems

EVALUATION: 1. What is mechanically operated brakes?

Differentiate between mechanically and hydraulically Operated brakes

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively

Lesson Notes By Weeks and Term - Senior Secondary 1