I have just replaced the front discs and pads, got a very good deal from Ebay for a set of Mintex discs and pads for £71 delivered.
After fitting them I went for a test drive and noticed that when the truck was driving in gear, if I keep the accelerator on and applied the brakes, the fuel was immediately cut to the engine.
This got me thinking, for this to happen the ECU must get signals from the vehicle speed sensor to say that the truck is moving, and from the NPS to say that it is in gear.
However the engine must still get fuel when say, in gear and stopped, or the opposite i.e. when in motion coasting downhill and the gears in neutral.
So my point is, when all is working correctly especially the NPS, every time the brake lights come on and the truck is in motion, the fuel supply to the engine is cut off, therefore providing a fuel saving mode.
But if a defective NPS is bypassed, this will not occur, as the trucks ECU will not know it is in gear, as in coasting.
How long it would take for the fuel savings to catch up to the cost of a new or re-machined NPS, depends how much the brakes are applied.
The dead engine when on the over-run will also have a mild braking effect, giving the brakes an easier time and longer life.
I suspected this was the case and have now confirmed it by accident.
After fitting them I went for a test drive and noticed that when the truck was driving in gear, if I keep the accelerator on and applied the brakes, the fuel was immediately cut to the engine.
This got me thinking, for this to happen the ECU must get signals from the vehicle speed sensor to say that the truck is moving, and from the NPS to say that it is in gear.
However the engine must still get fuel when say, in gear and stopped, or the opposite i.e. when in motion coasting downhill and the gears in neutral.
So my point is, when all is working correctly especially the NPS, every time the brake lights come on and the truck is in motion, the fuel supply to the engine is cut off, therefore providing a fuel saving mode.
But if a defective NPS is bypassed, this will not occur, as the trucks ECU will not know it is in gear, as in coasting.
How long it would take for the fuel savings to catch up to the cost of a new or re-machined NPS, depends how much the brakes are applied.
The dead engine when on the over-run will also have a mild braking effect, giving the brakes an easier time and longer life.
I suspected this was the case and have now confirmed it by accident.
