Training Bulletin 48: Engine Brake "Jake Brake" Flashcards
Advantages for apparatus equipped with “Jake Brakes” include increased ______, _____, _______, and cost-effectiveness.
Performance, safety, versatility
_____engines have substantially less retarding effect upon vehicles than a _____ engine.
Diesel engines
Gas engine
Why do Diesel engines have substantially less retarding effect?
Lack of restriction in diesel intake manifold
The gasoline engine has a butterfly in the carburetor which creates a _______ and subsequent engine braking.
Vacuum
The Jacobs Engine Brake is a ______ engine attachment that, when energized, alters the engine exhaust valve operation which converts the diesel engine into an ____ _____. This is accomplished by prematurely opening the ____ valves near the top of the ________ stroke releasing the compression pressure to exhaust.
Hydraulic
Air compressor
Exhaust
Compression
The engine brake may be used for descending grades, in ____ _____, when approaching ____ _____ and, in general, whenever vehicle retarding is required.
City traffic
Stop lights
The engine brake reacts quickly. It will activate or deactivate in less than ___ of a second.
1/4
The Department uses three (3) different Diesel Engine/Transmission combinations in its fleet. They are?
CUMMINS DIESEL WITH MANUAL TRANSMISSION
CUMMINS DIESEL WITH AUTOMATIC TRANSMISSION
DETROIT DIESEL (V-8 or V-6) WITH AUTOMATIC TRANSMISSION
CUMMINS DIESEL WITH AUTOMATIC TRANSMISSION
The Jake Brake switches on an apparatus equipped with an automatic transmission and a Cummins Diesel engine, will be on ON/OFF switch mounted on the?
Dash board
CUMMINS DIESEL WITH AUTOMATIC TRANSMISSION
A ____ position switch controlling the amount of retarding power desired, mounted on the dash board, a _____ ____ switch which de-activates the jake brake if depressed, and a ______ _____ switch mounted on the _______ to de-activate the jake brake at ____ speeds.
Three
Throttle pedal switch
Pressure sensing switch
Transmission
Low
JAKE BRAKE OPERATING INSTRUCTIONS:
- Engine should be fairly _____ before engaging JAKE BRAKE. Engine preheater _____ temperature is sufficient.
Warm
Water
A. ______engine retarding (#1 position on switch)
B. ______ engine retarding (#2 position on switch)
C. _____ engine retarding (#3 position on switch)
Minimum engine retarding
Moderate
Maximum
DETROIT DIESEL (V-8 or V-6) WITH AUTOMATIC TRANSMISSION
The Jake Brake switches used on an apparatus equipped with an automatic transmission and a Detroit Diesel engine, will be a single, ____ position switch, ____-____-____, mounted on the ____ ____.
Three position switch
Off-low-high
Dash board
DETROIT DIESEL (V-8 or V-6) WITH AUTOMATIC TRANSMISSION
Minimum engine retarding (“__” position on switch)
B. Maximum engine retarding (“__” position on switch)
LO
HI
USE OF THE JAKE BRAKE ON FREEWAY OR SIMILAR OPEN ROAD SHOULD BE DICTATED BY _______ _______ AND THE OPERATOR’S GOOD _______. DESIRABLE COAST OF APPARATUS IS ELIMINATED BY JAKE BRAKE RETARDATION.
TRAFFIC CONDITIONS
GOOD JUDGEMENT
USAGE GUIDE LIGHT TRAFFIC CONDITION
______ jake brake setting
Minimum
MEDIUM TRAFFIC CONDITION
_______ to ______ Jake Brake switch setting
Minimum to moderate
HEAVY TRAFFIC CONDITION AND EMERGENCY RESPONSES
______ Jake Brake switch setting
Maximum
DO NOT ENGAGE THE JAKE BRAKE ON ___ _____. THE ADDITIONAL BRAKING EFFORT ON THE DRIVE WHEELS (____) CAN CAUSE THEM TO LOCK UP WHICH COULD RESULT IN AN UNCONTROLLABLE SKID.
Wet streets
Duals
DO NOT ENGAGE THE JAKE BRAKE DURING PUMPING OR AERIAL OPERATIONS. This practice causes undesirable retardation, possible engine and component damage, and ______ _____.
Engine stalling
When accelerating the apparatus, DO NOT ____ using the Jake Brake.
Upshift
DO NOT ENGAGE THE JAKE BRAKE AT ____ OR _____ ENGINE SPEED. This will cause the engine to ____. To avoid stalling, depress the _____ or clutch pedal, or deactivate the Jake Brake by the ON/OFF switch.
Idle or low
Stall
Throttle
