Are you talking about the Jake Brake on semis?
Usually busses do not have retarders because they are too loud and cannot be used inside most city limits on a semi truck they have a switch to turn on the jake brake (engine brake, or retarder) when the switch is on and you let the accelerator all the way up the brake takes over. All a retarder does is use your air brakes (or hydraulic) less to prevent overheating that will lead to brake loss.
If your brakes are good and you know how to drive, sure. There was a time when there were no engine or exhaust retarders, and drivers simply had to gear down and take it nice and easy down a grade.
It's also known as an engine retarder brake. It opens the exhaust valves in the cylinders after the compression cycle. This releases the trapped air, and slows the vehicle down. Jake brake actually refers to the compression brakes made by Jacobs Vehicle Systems - however, it's become a generic term applied to all such systems. Not all retarders are engine compression brakes - there are also exhaust brakes, which can be in place of, or in conjunction with, engine compression brakes. These close off the flow of exhaust, and tend to sound more like vacuum cleaners.
take out the engine speed sensor in the transmission or transfer case depending if its manual or automatic
a retarder shouldn't be using an automobile in the first place
If engine vacuum is low the brakes will be difficult to push. Sometimes, if the engine isn't running well when it's cold, the vacuum level will be low and the brakes won't work well. Have someone check that out for you.
I would check the power brake booster
YES BUT NOT FOR LONG- THEY WOULD WORK ON RESERVE VACUUM 3-4 PEDAL PRESS
no it do not answer my question
Is your brake pedal hard ? If so replace the power brake booster. It sounds like you have a major vaccume leak in the booster when you apply the brakes. Power brakes work off of engine vaccume. If the dieafram is leaking vaccume when you apply the brakes it leans the engine out. ( creates a major vaccume leak ) and engine dies. Hope this helps.
You will still be able to steer the vehicle, but it's going to take lots of extra effort ... same is true of the brakes - more pressure is going to be required if you lose engine power.
No