Paccar DAF CF - Wheels and Tyres; Brake System Air Dryer

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5
Inspections and maintenance
5.1.9 Wheels and tyres
– Remove any stones and so on from the tread and from between the tyres (if twin
wheels are fitted).
– Check for evidence of wear and damage and for nails or other foreign objects
caught in the tyres.
– Check the attachment of the wheels.
– Check the tyre pressures (do not forget the spare wheel). Check and correct the
tyre pressures while the tyres are cold. See 'Technical data' or the back page of this
book for the correct tyre pressures.
NOTE: If a worn tyre is underinflated by 2 bar, the ABS control is
inoperative under extreme conditions! Also see 'Changing wheels' in
chapter 'Emergency repairs' of this manual.
5.1.10 Brake system air dryer
The air dryer system can be checked
for correct operation by inspecting the
air reservoirs for condensed water.
1. Check the air reservoirs for
condensed water by pulling on the
rings of the drain valves.
2. Replace the air dryer element if
more than the normal amount of
water is drained off repeatedly.
Consult a DAF Service dealer.
NOTE: If the system pressure drops rapidly, the air dryer system cannot
perform optimally. This pressure drop is caused by an air leak or by coupling
up a trailer without air.
If the air dryer system supplies a large volume of air quickly, its air-drying
function is not optimum. In this case, moisture might enter the air supply
system.
In this situation on a vehicle equipped with an SAC, the SAC issues warnings on the
master display. There are two warnings:
– 'Check for air leakage'.
This warning is self-explanatory.
– 'Drain air reservoirs '.
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DW63246305.book Page 171 Friday, March 22, 2019 4:54 PM