1. Neath Port Talbot College
Braking Systems
Anthony Davison
Welcome to Neath Port Talbot College!
Anthony Davison Brakes

2. Braking Systems
Most light vehicles have both front and rear braking. These are used to slow or stop the car.
Most cars have a parking brake or hand brake to keep the car stationary when parked. Handbrake travel can be adjusted on the lever and with correct shoe adjustment

3. Automobile Brakes - A Short Course on How They Work
At home you can access this site by typing in the web address below.

4. Pipes & Hoses Brake Pipe Lines From Master Cylinder
Solid pipes run the length of the vehicle
Flexible brake pipes are found where chassis movement is found

5. Pressing the Brake Brake Pedal Operation Can you name another
important device that is
operated at this point
Brake light switch

6. Pressing the Brake Master cylinder Brake fluid reservoir
Metal brake pipes

7. Front Brakes Brake pads Flexible brake pipe Brake pads & caliper
Brake disc

8. Checking Brake Pads
Q What is the minimum thickness of the brake lining ?
A Approx 3 mm (AON collecting data)
Q What is the reason for the copper grease ?
A It is used to lubricate moving parts and reduce squealing on operation
Q Name 2 other check that could be made to a vehicle within this picture ?
A 1 condition of disc
2 condition of flexible brake pipe

9. Brake Disc Inspection
Surface should be checked for scores and an edge lip
Disc Thickness is checked across here
Edge lip is found here

10. Brakes and Technical Data
Brake disc dimensions as found on “Auto Data”
Keyskills
ICT Collecting data

11. Checking Brake Pads
CDX Video demonstrations

12. Rear Brakes Brake shoes Inspection Note the rear wheel bearing
It is a tapered bearing

13. Brakes and Health & Safety
Brake dust is
highly dangerous.
Before work is carried
out brake spray should
be sprayed to prevent
dust being inhaled

14. Checking Rear Brake Components
Name 3 typical checks that should be made to the components shown in the picture
Check rear wheel cylinders for leaking
Check condition and wear of brake linings
Check security of components and adjustments

15. Brake Shoe Inspection
Inside a wheel cylinder

16. Brake Master Cylinder Brake fluid is hydroscopic What does this mean :
Ans It means that the fluid can absorb moisture and thus lose its viscosity. For this reason brake fluid should be changed approx every 20,000 miles
Brake fluid must also have a high boiling point as friction caused by operating brakes causes heat.
Evaporative lock is when brake fluid gets so hot it evaporates and acts as if there is air in the system.

17. Correct Brake Fluid
The correct brake fluid must be sought for the vehicle. By referencing “Auto Data” etc, you can access the manufactures recommended grade

18. Brake Test Efficiency
Testing brake performance on a rolling road

19. Brake Efficiency
The MOT requirement of a car states that the brake efficiency for the Foot or Service brake brake is at least 50% efficient
The hand brake on modern cars must be 16% efficient

20. Calculating Brake Efficiency
Using a rolling road brake tester as shown you would collect the brake reading for all the four wheels. Using the four reading you would calculate the efficiency by using the formula shown.

21. Calculating Brake Efficiency
Brake efficiency formula (AON keyskill collecting data)
TOTAL BRAKE EFFORT
VEHICLE WEIGHT
X 100 = BRAKE EFFICIENCY IN %
Service or pedal brake must be more than 50% efficient to pass MOT
The Hand brake must be more that 16% to pass

22. Brakes What’s Next ??
The next lessons to be covered in braking systems are.
Self servo action of brake shoes.
This will allow you to complete all outcomes of practical task 10 in you workshop assessments.
Carrying out a brake efficiency test