High & Low For Jakes or High Only?

[John316]

Belfert and BW,

Thanks for the tips on a S60 with a B500. We are going to get Jakes on ours this summer, so this info was helpful.

I tell you what. I love that S60 engine with the B500, that is one great setup!

God bless,

John

[Brian Diehl]

Just a comment on the effectiveness of jakes ....
I don't know if anyone else has noticed this, but the jakes on my engine (Cummins ISM) are MUCH more effective at Minnesota altitudes than they are up at 10,000' plus out in CO.  I'm amazed at how much better they respond down at sea pressure than up at high altitudes.  They do make a difference at high altitudes, but you can definitely feel the effect of altitude!

[pvcces]

10-4.

We notice the same effect in our 8V71. At 7,500 feet, the Jakes are pretty weak.

Take care.

Tom Caffrey

[NewbeeMC9]

Jack,

I have 8v71 and 740 and only High switch Jake.

this bus is my only experience with all.

I use the Jakes to maintain "slow" down a hill and not necessarrally to stop.  I use brakes to stop.

I usually find that there is a speed that it will maintain and above that it will start speeding up.


I'm not sure how mine are wired up, however they cut out at a really low speed, and as far as the torque convereter.  Mine does not seem to unlock until a certain low speed in first.  I.e. locks after shifting into second on the way up and un-locks in first on the way down.

Just my 2 cents, skewed as it may be

[belfert]

I too only use my Jakes to control speed, not to brake to a stop.  I'm not sure if the Jake is supposed to be able to hold the speed on a somewhat steep grade like I80 into Salt Lake City.  I have to brake every 60 seconds at least to control my speed.