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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #1  
Old 12-14-2010
Who Moved my Stuff ? Who Moved my Stuff ? is offline
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Question Jake Brake tutorial

I have a three speed Jake brake, but I'm not absolutely sure how to properly use it.

Currently when I see a knuckle whitener downgrade, I switch the Jake on Low and brake to slow.

Consider that I'm a newbie, and negatiating dry, wet and snow combinations, and I'm looking at a 6900 ft pass tomorrow.

Occasionally there's a red warning light comes on, about excees RPM's.

Any help would be appreciated.

Thanks
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  #2  
Old 12-14-2010
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Quote:
Originally Posted by Who Moved my Stuff ? View Post
I have a three speed Jake brake, but I'm not absolutely sure how to properly use it.

Currently when I see a knuckle whitener downgrade, I switch the Jake on Low and brake to slow.

Consider that I'm a newbie, and negatiating dry, wet and snow combinations, and I'm looking at a 6900 ft pass tomorrow.

Occasionally there's a red warning light comes on, about excees RPM's.

Any help would be appreciated.

Thanks
Ian I too am new to Jake Brakes but I don't have the red warning light you have. I'd really appreciate it if you could tell me at what RPM your warning light comes on???
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Old 12-14-2010
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The warning light is part of the Detroit trip analyzer. It seems to come on at about 2300 RPMs, Normally about 1500 RPM's is about 60 mph.

My observations are a best guess, because I'm focused on trying to keep the rubber side down.
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Old 12-14-2010
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Ian,

The three positions on your jake brake correlate to the number of cylinders used in the braking action of the actual Jacobs brake. Each position controls 2 cylinders on your engine. Very simply put, it kind of turns your engine into a air compressor by limiting action on the valve train. You may leave the jake brake switch on and it will actuate when you release the throttle when driving in mountainous terrain or when required. You will get to know where to hold your foot to coast with no jake.

To achieve maximum braking you would switch it to the maximum position so all cylinders are functioning which is probably the 3 position. 3x2 equals all 6 cylinders in operation. The jacobs brake is a very good engine brake.

You should exercise caution in slippery conditions if you actuate it by backing off the throttle or the switch. It has to be very slippery to lock up the rear wheels but it can happen particularly in icy conditions.

Best to go slow and creep down a hill with out the jake in very bad conditions. Even with a jake it is important not to overdrive a down grade. Just imagine what could happen if it quit part way down. I have seen this happen at Field BC near you. Never take it for granted. Think of it as a brake saver.

If it is slushy or compact snow of course you can start off in the first position and then increase to the second and third position to test your traction. You will know if it locks up as the engine will sound like a stall but the computer should keep it from stalling completely I believe. Of course if the back end of your bus goes sideways that too will tell you that the wheels have locked up. I don't mean to scare but it is important that you know what can happen.

You jake does require periodic maintenance.

What pass are you negotiating tomorrow?

Cheers,
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Old 12-14-2010
Itchintogo
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Ian,

Stay below your red light warning so as not to over speed your engine. Valves tend to go through pistons on engines that are run too fast. So use your brakes to get those RPM down. 2100 is plenty fast in my opinion.

Again let me know what pass your are going over as I am very familiar with every one of them around you and can give you a couple of pointers to get you started.
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Old 12-14-2010
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Default MonIda Pass

I'm traveling South on I-15 from Butte MT to Pocatello ID.

Conditions are as good as can be expected.
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Old 12-14-2010
Who Moved my Stuff ? Who Moved my Stuff ? is offline
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So in mountainous terrain, its best to drive with the jake in high, and on continuously?

or to engage it only when needed?
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  #8  
Old 12-14-2010
Hisham Amaral Hisham Amaral is offline
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Ian

I usually keep my speed below 55 MPH before I turn the Jakes on, at that speed the engine will not exceed the 2100 RPM. When I first got the coach I had the Jakes on at 65 and as you stated the engine will go to 2300 RPM and a red light warning will come on. I spoke to Detroit diesel in Orlando Florida, they had no concern with 2300 RPM's, they said the engine is good to 2600 RPM I don't believe that. Good luck with your Journey to South country, we in Florida are under a hard freeze condition.
Randy could you give us a pointer on this subject? Thanks
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  #9  
Old 12-14-2010
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Ian.
Just like your foot brake,the Jake brake can get you into trouble on ICE/SNOW!

I would set it on low as i start down the mountain,and I would be going slow already.
If its snow and ice,go slow.
Remember,the Jake brake is slowing you down through your rear wheels only.
Your foot brake is using all wheels to slow you down.
Using just the Jake could cause you to slide the rear wheels on ice.

Chances are that on I-15 the roads will be fine,get on your CB and ask the other drivers what the road looks like,and take it slow.
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Old 12-14-2010
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On the topic of Jake brakes.
If you set your cruise control at 30MPH,and then turn on the Jake,the Jake will slow you down to 30MPH,and then kick off.
Turn the cruise control off,and the jake will slow you down to maybe 15MPH.
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