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Old 04-25-2016, 09:00 AM   #29
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Quote:
Originally Posted by mel s View Post
whitetop
Methinks you have the 2 different types of engine brakes confused.

I know that some "compression release engine brakes" have a Hi/Low setting, but I was not aware that any "exhaust brake" had Hi/Low settings.
(My PacBrake can only be set to ON or OFF).

Do you have an "exhaust brake" or a "compression release brake"?
Wondering

Mel
'96 Safari, 3126 Cat
You are correct Mel, the "Exhaust" Engine Retarder is ON/OFF.
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Old 04-29-2016, 04:48 AM   #30
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I have another update: I had my wife follow me to check for brake lights when engine is breaking, and indeed they come on.
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Old 04-30-2016, 06:52 PM   #31
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Let me try to set the record straight here. All this talk about PAC brakes, compression brakes, Jake Brakes and exhaust brakes can be very confusing.

You have the Cummins ISL engine in your coach, same as we have in ours. You have a 2-stage Compression Brake, which is also called a "Jake Brake" by most truckers. It is not a PAC brake or an exhaust brake, it is a 2-Stage COMPRESSION BRAKE. A compression brake provides more braking force than any other type of engine brake.

One easy way to check if yours is working in both stages is to see if you have the "Cummins shake" when it's on low. Here's how to test it.

Put the Jake Brake in the HIGH position.
Get rolling about 25-30 mph and then let off the throttle.
Let the Jake Brake do its thing until it release when it reaches 1,000 RPM in 2nd gear. That will happen around 15 mph.
The slow-down should be smooth with no shake or vibration all the way down to 15 mph.

Now run the exact same test with the Jake set on LOW.
If it's working properly, just before the brake releases at 1,000 rpm, you'll feel a few moments of rapid shaking or vibration. This is because in the low position, only 3 cylinders are providing the braking force. As the RPM slows through the 1,200 to 1,000 RPM range with only 3 cylinders braking, the ol' Cummins will shake a little bit, just before the brake releases at 1,000 RPM.

This shake is quite obvious and noticeable. It's not something subtle. If you don't feel it, the Jake Brake is not working in low.
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Old 04-30-2016, 07:13 PM   #32
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Originally Posted by Rich-n-Linda View Post
Let me try to set the record straight here. All this talk about PAC brakes, compression brakes, Jake Brakes and exhaust brakes can be very confusing.

You have the Cummins ISL engine in your coach, same as we have in ours. You have a 2-stage Compression Brake, which is also called a "Jake Brake" by most truckers. It is not a PAC brake or an exhaust brake, it is a 2-Stage COMPRESSION BRAKE. A compression brake provides more braking force than any other type of engine brake.

One easy way to check if yours is working in both stages is to see if you have the "Cummins shake" when it's on low. Here's how to test it.

Put the Jake Brake in the HIGH position.
Get rolling about 25-30 mph and then let off the throttle.
Let the Jake Brake do its thing until it release when it reaches 1,000 RPM in 2nd gear. That will happen around 15 mph.
The slow-down should be smooth with no shake or vibration all the way down to 15 mph.

Now run the exact same test with the Jake set on LOW.
If it's working properly, just before the brake releases at 1,000 rpm, you'll feel a few moments of rapid shaking or vibration. This is because in the low position, only 3 cylinders are providing the braking force. As the RPM slows through the 1,200 to 1,000 RPM range with only 3 cylinders braking, the ol' Cummins will shake a little bit, just before the brake releases at 1,000 RPM.

This shake is quite obvious and noticeable. It's not something subtle. If you don't feel it, the Jake Brake is not working in low.

Or low setting wont put you into the windshield as high does!
Ok, not really but it is a great braking system!
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Old 04-30-2016, 07:49 PM   #33
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Quote:
Originally Posted by Rich-n-Linda View Post
Let me try to set the record straight here. All this talk about PAC brakes, compression brakes, Jake Brakes and exhaust brakes can be very confusing.

You have the Cummins ISL engine in your coach, same as we have in ours. You have a 2-stage Compression Brake, which is also called a "Jake Brake" by most truckers. It is not a PAC brake or an exhaust brake, it is a 2-Stage COMPRESSION BRAKE. A compression brake provides more braking force than any other type of engine brake.

One easy way to check if yours is working in both stages is to see if you have the "Cummins shake" when it's on low. Here's how to test it.

Put the Jake Brake in the HIGH position.
Get rolling about 25-30 mph and then let off the throttle.
Let the Jake Brake do its thing until it release when it reaches 1,000 RPM in 2nd gear. That will happen around 15 mph.
The slow-down should be smooth with no shake or vibration all the way down to 15 mph.

Now run the exact same test with the Jake set on LOW.
If it's working properly, just before the brake releases at 1,000 rpm, you'll feel a few moments of rapid shaking or vibration. This is because in the low position, only 3 cylinders are providing the braking force. As the RPM slows through the 1,200 to 1,000 RPM range with only 3 cylinders braking, the ol' Cummins will shake a little bit, just before the brake releases at 1,000 RPM.

This shake is quite obvious and noticeable. It's not something subtle. If you don't feel it, the Jake Brake is not working in low.
Quite interesting info - Experiment time in the coach.....

Brian
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Old 05-01-2016, 08:06 AM   #34
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Thank you Rich for your reply. When the engine is braking I do believe I have felt that vibration. I will check and post results.
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Old 05-01-2016, 08:26 AM   #35
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Just to add to the confusion, the High/Low switch on mine is the opposite of what Rich describes: HIGH is less braking and LOW is more. I think of mine as being like High Gear and Low Gear, rather than High braking and Low braking.

I've heard from others whose switch is wired like mine, so it probably is common.
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Old 05-01-2016, 09:15 AM   #36
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Gary, the Jake Brake switch is "backwards" in our coach, too. All I would have to do is swap two wires on the switch to fix it, but I never seem to remember to do it!
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