Question about 1970 DAF 44

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My leyland daf 45 air brake buzzer is in when the tanks are full

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  • 36 Answers

Probably the sensor or wiring faulty

Posted on Aug 18, 2014

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SOURCE: need a diagram for for heater fan in leyland daf 45 120

Blower motor resistor or heater fan resistor. It should be located in the plenum air flow to keep it relatively cool. Also check the wiring harness for any melted wires, or corroded connections on the resistor block. Any deformities in the plastic warrant replacement of that part of harness connector since I do not think your local vehicle inspection laws would allow it to be soldered to the harness.

Posted on Feb 13, 2012

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1 Answer

Full brake air pressure on Daf CF but gauges read zero,buzzer remains 'on'and dash reads 'low brake air pressure' and ABS fault.-- fitted sensor unit at air dryer but no change. Help would be great


check the air pressure switch at the tank supply line at the foot ( treadle ) valve if that switch is not operational then it may be where the system is not getting a full pressure report
you should have a pressure reading on the air gauges in the dash as they read from the air tanks
remove the compressor line to the tank and check for air flow from the compressor when running as some european built trucks have the steel line as n air cooling line and they tend to carbon up internally and block air flow( scania in particular uses a pipe shaped as a coil that was very bad in design

Jun 12, 2017 | DAF Cars & Trucks

1 Answer

How do i fix a brake buzzer that goes off while driving a nissan ud 80 truck,seems like the air pump cannot keep up


if it has a belt driven air compressor check belt and tension
it could be a buzzer problem
it could be an air leak in the system ( possible in the park brake diaphragms )
install an air gauge in the drain plug of a tank and monitor the air pressure use
with the truck being driven normally then the tank pressure should not show much variation
test the brake system by tuning the engine off, hold and apply the foot brake and see if the pressure continues to diminish indicating a leak in the system or foot valve operation
finally take it back to nissan ud as it will be still under warranty

Aug 24, 2016 | 2012 Nissan NV

1 Answer

Buzzer in cab stays on and also the brake light is on what do u suggest i should do ? Becaused i replaced the brake line.


I suspect your speaking about an air brake system (even though you don't say so?) but the buzzer is there to tell you that your supply air tank does not have enough pressure built up to drive safely , and I suspect the light is on too let you know this as well . id b looking for an air leak or an unloader valve that is stuck (its common) with engine running at idle u should be able to detect a air leak of that volume by ear

Jul 01, 2016 | Cars & Trucks

2 Answers

On my Kenworth K104 the low air buzzer comes on after only 3 brake applications, the air pressure is set to 850kpa.


Are you draining water from the air tanks. There should be small taps on the bottom of all air tanks. Locate these and open slowly when system is under pressure. Make sure you close them when finished.

Jun 02, 2016 | Cars & Trucks

1 Answer

Daf 45 1992 overheating


If the over heating is occurring at idle at lights , long slow pulls under load, slow moving traffic, I would be investigating the fan drive system. If it is a viscous fan hub I would have it replaced. If it is a horton fan clutch ( air controlled ) system I would be looking at the clutch and control for the air. Other than that, pressure test for coolant leaks, check for over fuelling ( turbo not working properly) and a compression test to check for gaskets and cracked head

Jan 08, 2015 | DAF Cars & Trucks

1 Answer

How to adjust front drum brakes daf 50 1993


Are these air operated brakes using a lever on a shaft or does the diaphram go directly into the backing plate.

Dec 30, 2014 | DAF Cars & Trucks

1 Answer

Why wont my leyland daf 45 Horsebox start after it ran out of diesel then was refueled


you have to vent the air in the injection pump crack the injector pipes and crank the engine till fuel come out then re secure the pipes it will start then

Jul 28, 2014 | 1970 DAF 44

1 Answer

I Have a Leyland daf LF 45 When the engine warms up the turbo stops cuting in, I've had a fitter look at it and he said the turbos work and ideas any one thanks


turbos work from exhaust gas temperature and exhaust gas flow. There is nothing else that works them so can you be more specific as to what you mean by "stops cutting in"

Jun 21, 2014 | Cars & Trucks

1 Answer

Need a diagram for for heater fan in leyland daf 45 120


Blower motor resistor or heater fan resistor. It should be located in the plenum air flow to keep it relatively cool. Also check the wiring harness for any melted wires, or corroded connections on the resistor block. Any deformities in the plastic warrant replacement of that part of harness connector since I do not think your local vehicle inspection laws would allow it to be soldered to the harness.

Feb 12, 2012 | DAF 44 Cars & Trucks

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