What would cause a Jake Brake to not work ?
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by SilverBulletBand, Nov 27, 2023.
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Would that also cause the Cruise Control to go out as well ??
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Clutch pedal little loose therefore depressing clutch switch maybe? Same for brake pedal but that's easier to see it should light up your brake lights
Magoo1968, Rideandrepair, SilverBulletBand and 2 others Thank this. -
Rideandrepair and SilverBulletBand Thank this.
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The pedal had a good 2-3" of "PLAY" when I started driving this particular truck.
Was told by the shop that the clutch was SHOT.
I took up the play by adding a long screw with an adjustment nut. Put it through the hole that lined up with the clutch pedal linkage. I adjusted it to have about 1/2" of play. Actually worked out perfect. Nice clutch feel and action.
I didn't know about the clutch switch causing these issues. How much play should the clutch pedal have in it to still activate that switch ?Rideandrepair Thanks this. -
SilverBulletBand and Rideandrepair Thank this.
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Does pushing in on the Clutch activate the switch that disengages the engine brake and cruise control ?
Perhaps I need to adjust that adjustment bolt I put in.Magoo1968 Thanks this. -
Usually you can hear a click sound when it either engages or disengages the switch when clutch pedal is either fully at the top or depressed a bit. If you really wanted to check you could hook the computer to it and see what ecm is seeing as far as clutch/brake/fuel pedal position sensors are telling the ecm. The switch itself could be bad. Also can look what the ecm is seeing as far as cruise on/off, if it detects when you push set, same for jake on/off. But considering they're both not working I'd be surprised if it's anything other than your pedal sensors.
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SilverBulletBand Thanks this.
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