DAF LF45, LF55 Series. Manual — part 477

©

200436

1-5

General

BRAKING PERFORMANCE AND BRAKE EQUALISATION

ΛΦ45/55 series

6

5

1.4 BRAKE EQUALISATION FORM FOR BRAKE DYNAMOMETER

R600119

R

L

L

R

L

R

0.5

1.0

1.5

2.0

3.0

4.0

5.0

%

%

%

%

%

%

%

R

L

L

R

L

R

0.5

1.0

1.5

2.0

3.0

4.0

5.0

%

%

%

%

%

%

%

p

p

p

p

m 1 + m 2 + . . . . . .

m 1 +

m 2 + . . . . . .

m 1 + m 2 + . . . . . .

m 1 +

m 2 + . . . . . .

R

L

R

L

R

L

R

L

R

L

R

L

F1

F2

F3

F1

F2

F3

F1+F2+F3

m 1 + m 2 + . . . . . .

F1+F2+F3

X 100 %

F1+F2+F3

X 100 %

m 1 + m 2 + . . . . . .

F1+F2+F3

BRAKING PERFORMANCE AND BRAKE EQUALISATION

1-6

©

200436

General

5

ΛΦ45/55 series

6

Filling in brake equalisation form for brake
dynamometer

Note:

1 kg = 10 newtons (N)

1.

Determine the weight of the laden prime

mover and/or trailer vehicle (coupled), and

enter these values in the table (in kg or

newtons).

2.

Make a short test run to warm up the brakes.

3.

Position the vehicle, starting with the front

axle, on a brake dynamometer.

4.

Connect a pressure gauge to the yellow

coupling head.

5.

Depress the brake pedal until the pressure

gauge reading is 0.5 bar.

Always build up pressure, i.e. from low to

high pressure, and never from high pressure

to low pressure, and always begin every

measurement with 0 bar.

6.

Read the braking forces and write them

down in the appropriate column (in kg or

newtons).

7.

Now repeat this procedure at pressures of

1.0 - 1.5 - 2.0 - 3.0 - 4.0 and 5.0 bar.

8.

Also perform these measurements on all

other vehicle axles.

9.

Count all braking forces that belong to a

certain braking pressure and note these in

the "Total braking force" column.

10. Divide the braking forces (in kg or newtons)

just entered at point 9 by the weight of the

vehicle (in kg or newtons), multiply the result

by 100 (%) and enter the values thus

obtained in the next column.

braking deceleration as % of the weight

11. Plot the values obtained in point 10 in the

relevant EC tyre graph.

F

p

R600029

©

200436

1-7

General

BRAKING PERFORMANCE AND BRAKE EQUALISATION

ΛΦ45/55 series

6

5

Example of a diagram for a prime mover and

trailer vehicle with poor brake balance.

Example of a diagram for a prime mover and

trailer vehicle with correct brake balance.

The combination is correctly balanced if the

braking performance at 2 - 3 bar for the truck and

the trailer vehicle are in a comparable position in

the appropriate EC band, i.e. both in the upper

part, both in the lower part or both in the middle

part.

%

a

40

30

20

10

0

1

0

2

3

4

5 bar

p

%

a

40

30

20

10

0

1

0

2

3

4

5 bar

p

R600022

BRAKING PERFORMANCE AND BRAKE EQUALISATION

1-8

©

200436

General

5

ΛΦ45/55 series

6

1.5 EC BAND FOR A LADEN TRACTOR/SEMI-TRAILER COMBINATION

The "EC band" indicates the limits within which

the deceleration value must lie.

The "EC band" applies to:

-

tractor with conventional brake system

-

semi-trailer with conventional or EBS brake

system

100

%

a

90

80

70

60

50

40

30

20

10

0

1

0

2

3

4

5

6

7

8

R600881

EBS

EBS

P (bar)

EBS