Jacob's engine brake - Jake brake

Question 1

Jacob’s engine brake

On year trucks

Answer 1

1993, Some 1995, Some 2001, 2002, 2003, 2006, 2009

Question 2

The Jacob’s engine brake (Jake Brake) is a device, which uses the energy of the engine compression to provide vehicle retardation. Engine brakes provide the maximum
retarding power at ____; therefore, gear selection is important.

Answer 2

rated speed

Question 3

Jacob’s engine brake

This is accomplished by a hydraulic circuit that opens the exhaust valves near the end of the ______ stroke.

Answer 3

compression

Question 4

Jake brake control consists of the following:

Answer 4

A three-position selector switch.

An on/off switch to activate or deactivate the system.

A throttle sensor.

Question 5

Jacob’s engine brake

The engine brake converts the engine to an energy-absorbing device to reduce vehicle speed.

Answer 5

reference

Question 6

Jacob’s engine brake

_____ engines have substantially less retarding effect upon vehicles than do _____ engines.

Answer 6

Diesel

gasoline

Question 7

Jacob’s engine brake

This is due to lack of restriction in the diesel intake manifold. The gasoline engine has a butterfly valve in the carburetor, which creates a vacuum and subsequent
engine braking.

Answer 7

reference

Question 8

The Jake brake is a hydraulic engine attachment that, when energized, altars the engine exhaust valves operation which converts the diesel engine into an air compressor. This is accomplished by prematurely opening the exhaust valves near the top of the compression stroke releasing the compression pressure to exhaust.

Answer 8

reference

Question 9

Jacob’s engine brake

The engine brake may be used for descending grades, driving in city traffic, or when approaching stop lights and, in general, whenever vehicle retarding is required.

Answer 9

reference

Question 10

There is no time limit with respect to the operation of the Jake brake. The engine’s cooling system will continually absorb and dissipate the heat generated by its continual
use.

Answer 10

reference

Question 11

Jacob’s engine brake

The engine brake reacts quickly; it will activate or deactivate in less than ___ of a second.

Answer 11

1/4

Question 12

Jacob’s engine brake

The three-position selector switch allows the operator to choose the desired braking level:

Low – Activates ___ cylinders for medium engine retarding.

Medium – Activates ___ cylinders for moderate engine retarding.

High – Activates ___ cylinders for maximum engine retarding.

Answer 12

two

four

six

Question 13

The engine should be fairly warm before engaging the Jake brake. The engine preheater water temperature is sufficient.

Answer 13

reference

Question 14

Do not engage the Jake Brake on wet streets. The additional braking effort on the drive wheels (duals) can cause them to lock up which could result in an uncontrollable skid.

Answer 14

reference

Question 15

Do not engage the Jake Brake during aerial operations. This practice causes undesirable retardation, possible engine and component damage, and engine stalling.

Answer 15

reference