DAF LF45, LF55 Series. Manual — part 455

©

200436

1-1

Safety instructions

BRAKE SYSTEM AND COMPONENTS

ΛΦ45/55 series

6

4

1. SAFETY INSTRUCTIONS

1.1 SAFETY INSTRUCTIONS

Always observe the local safety and

environmental regulations.

If the parking brake is deactivated

when working on the vehicle, place

chocks in front of and behind the

wheels to prevent the vehicle from

moving.

The substances and auxiliary

substances (to be) used may

constitute a direct or indirect health

hazard. For that reason, always wear

protective clothing and protective

equipment (e.g. goggles, gloves) to

prevent inhalation, skin contact, etc.

Use only the specified special tools.

Parts of threaded connections have

to be clean and free of lubricants

before use.

Check the correct operation of the

vehicle, and the brake system in

particular if work has been carried

out on it, before handing over the

vehicle to the user.

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BRAKE SYSTEM AND COMPONENTS

1-2

©

200436

Safety instructions

4

ΛΦ45/55 series

6

©

200436

2-1

Inspection and adjustment

BRAKE SYSTEM AND COMPONENTS

ΛΦ45/55 series

6

4

2. INSPECTION AND ADJUSTMENT

2.1 INSPECTION, COMPRESSOR CAPACITY

1.

Bring the engine up to operating

temperature.

2.

For a vehicle with air suspension, the

chassis should be at the normal driving

height.

3.

Put chocks in front of and behind the rear-

axle wheels to prevent the vehicle from

moving.

4.

Position the parking brake in the driving

position.

Note:

If, when draining the air reservoirs, they

appear to hold an excessive quantity of oil,

check the condition of the compressor and

check the compressor for the presence of

carbon deposits in the compressor pipes.

5.

Bleed the entire brake system.

6.

The capacity test requires that a completely

empty system should be at operating

pressure within 5 minutes, at an engine

speed of 0.6 x maximum engine speed.

BRAKE SYSTEM AND COMPONENTS

2-2

©

200436

Inspection and adjustment

4

ΛΦ45/55 series

6

2.2 INSPECTION, FOOT BRAKE VALVE

Inspection, foot brake valve
1.

Connect a pressure gauge to a brake

chamber of the front axle (in front of the

empty/load valve, if present).

2.

Connect a pressure gauge to the test

connection of the load-dependent control

valve.

3.

Pressurise the system.

4.

Depress the brake pedal a few times,

alternately quickly and slowly, until the end

stop is reached. Check if there is a

discrepancy between both gauge readings

(discrepancy maximum 0.3

≥ 0.15 bar, at

circuit 21 between 0 and 3 bar).

5.

If the brake pedal is gradually depressed,

there must be no pressure jumps of more

than 0.3

≥ 0.15 bar in either circuit, at circuit

21 between 0 and 3 bar.

6.

When the foot brake valve is completely

depressed, the reading of both gauges

should indicate the max. output pressure.

See "Technical data".

7.

When the brake pedal is not depressed, the

pressure gauges should not indicate any

pressure.