Assuming you're talking about a brake control valve, there is no wiring...
The brake light switch is not air actuated.
Typically, there's a hot switch attached to the pedal which closes the circuit to the brake lights (or to the CECU board in a truck which uses CAN BUS communication).
the brake light switch is an air over elec. switch located in an air block on the floor behind steering shaft
No, the brkae light does operate with the air but it opporates by a switch that the air itself pushes.
Cage the brake chambers and tow it.
If you have air brakes in your truck, they're talking about the air pressure in your air brake system. You should have at least 90 psi before you take off.
They are what's used to connect the trailer to the trailer supply air lines.
air coming out of the brake lines... that is if its a truck. if you aply the parking brake.
If the exhaust brake on your Isuzu truck is not working, first check the exhaust brake switch to ensure it is activated. Inspect the air supply and connections for any leaks or blockages, as proper air pressure is essential for operation. Additionally, examine the exhaust brake valve for any signs of damage or debris that may be preventing it from functioning. If these steps do not resolve the issue, consult a professional mechanic for further diagnosis and repair.
Check the following............... 1. Freon system level. 2. Pressure switch. 3. Clutch wire harness. 4. If above are okay then scan the vehicles computer.
there are only two switches that share the brake light circuit, One switch is under the hood,below the master cylinder is a brake line junction block,This switch only has one function,it trips its self and turns on the brake light on the dash when it finds any air in the brake fluid system at all,like if a brake line broke on you and you lost your pedal and pumped air in. Has any wheel cylinders or calibers or brake lines been changed on your car? And this light happened right afterward? If yes,then there is an air bubble in the brake system and it is probably located in the junction block by the switch,But you said the brakes are working fine,no low pedal. If all above is ok and your pedal is normal: The second switch that shares the brake light bulb on dash, Is the emergency brake, This switch turns the light on as soon as the emergency brake even moves on with the first click, If you emergency brake is on the floor,on the left kick panel,and you push the pedal down to use it, you will need to take a look under the dash where the e-brake pivots,there you'll see the switch,just reach up and disconnect the wire to eliminate this as the cause of your light, If your emergency brake is beside the console,if you have a floor shift,The switch is down where the e-brake handle pivots,its harder to get to but unhook the wire,
behind the drivers seat in an air manifold under a plastic cover... but more often than not your problem is in the directional switch as it also controls the brakes and the directionals on single wired units... replace the directional switch