It is usually a leaver connected to a valve on the exhaust manifold that restricts the flow of the gasses coming from the engine cylinder's witch have pistons that move up and down , that are connected to the crankshaft by con rods , through the gear box , on to the drive shaft , down to the diff , half shafts to the wheels that then helps slow the truck down
When Exhaust brake is on squeak noise comes from the engine?"
The green light in the instrument cluster means that the exhaust brake is on, which is a good thing if you drive mainly in the city. the exhaust brake allows you to elongate the life of your brake shoes or pad by using engine exhaust as a brake.
You may have a bad power brake vacuum operated booster.
It removes fuel vapors
Located on the head of the engine, at the end of the intake or exhaust cam.
A retarded is either an engine compression brake, and exhaust compression brake, or a system which combines the two.
Some examples are the emergency brake, emergency lights and emissions.Some more are the engine, engine block, exhaust pipe and exhaust system.
On modern vehicles the brake system is enhanced by a vacuum operated "booster". This makes the brake pedal softer and more responsive. When the engine is turned off the engine no longer produces vacuum to supply the booster so the pedal gets hard.
Vapor lock in a brake or fuel system is pretty much a thing of the past. If you are experiencing it, then check to see if a brake line is routed too close to the engine, exhaust manifold, or any of the exhaust system. Also drain the brake system and install fresh brake fluid. It may be contaminated with moisture.
That would be the power brake vacuum operated booster.
The Jake Brake, made by Jacobs Engine Products, works by opening the exhaust valves on your engine in a certain number of cylinders. This reduces the power the engine can create.
In most cases a brake light switch is of the normally open type when the brake pedal is operated this makes the switch a closed circuit which lets the current flow from the fuse to the vehicles brake lights On some older British vehicles the switch was in the brake line it was operated by the hydraulic pressure in the brake circuit when the pedal was operated