EXHAUST BRAKE
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Joined: Sep 2007
Posts: 300
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Stumbled across this site before I bought the Jacobs. http://www.o-f-i.com/index.php?pid=11. Only $300 for a pump, and $120 for a pump pod. The pod sounds like rebuild kit of some sort?
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Joined: Sep 2005
Posts: 62
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From: Bay Area
You should do both valve springs; I wished I did. I installed my cummins/jacob exhaust brake 4 days ago with the 60lb exhaust springs that came with the kit. It would have taken me another 45 mins to install the intake valve springs since you already remove the rocker arms, head bolt, etc but I didn't think about it at the time.
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Joined: Sep 2006
Posts: 911
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From: Oklahoma
thanks... that's what I'm planning on doing.
have anyone gotten any more feedback about too much tension on valve seats from 60lb springs. logic says if that was a problem 24valve cummins would be having valve issues.
have anyone gotten any more feedback about too much tension on valve seats from 60lb springs. logic says if that was a problem 24valve cummins would be having valve issues.
You should do both valve springs; I wished I did. I installed my cummins/jacob exhaust brake 4 days ago with the 60lb exhaust springs that came with the kit. It would have taken me another 45 mins to install the intake valve springs since you already remove the rocker arms, head bolt, etc but I didn't think about it at the time.
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Joined: Oct 2008
Posts: 41
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From: Indpls, IN
that make no sense at all.. you've got other things that work off vacuum on your truck. so you've got to fix your vacuum pump regardless if jacob brake is there or not.
$950 is outrageous for a vacuum pump. does anyone have an aftermarket pump yet? about the only thing you can do is purchase pump from someone like oriellys that will give a lifetime warranty
$950 is outrageous for a vacuum pump. does anyone have an aftermarket pump yet? about the only thing you can do is purchase pump from someone like oriellys that will give a lifetime warranty
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Joined: Sep 2006
Posts: 911
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From: Oklahoma
wow... didn't realize 2007 cummins uses zero vacuum accessories.
how does the air conditioning duct routing work?
what operates the 4x4 engagement (on 4x4 of course)
how does the air conditioning duct routing work?
what operates the 4x4 engagement (on 4x4 of course)
Registered User
Joined: Oct 2005
Posts: 384
Likes: 1
From: San Antonio, Texas
Electric motors/actuators in A/C. 4X4 is either manual lever (on my truck) or electric motor on others. No vacuum on my 2005 either. This may be same for all 3 Gens...
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Joined: Jan 2002
Posts: 307
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From: Silver City, New Mexico
I had the Pac Brake installed by the dealer when I bought my '02 new. Within 50,000 miles it was sticking shut and had to pull over and beat on it with a hammer handle to get it open. Fooled with it off and on for several years and finally was told (by Pac Rep ??) on this forum to put vacuum filter, etc., etc. and did all that. Better, but took 10,000 miles to really work properly again. Truck now has 150,000 miles and I've given up on the Pac Brake.
When working (??) it does do a very good job and saves the brakes very well. Very frustrating to hafta find a pull out to bang on the thing to open it. With it closed you will Not keep driving........I promise you.
Less than a year later - this spring - it jammed up again. Had it apart, cleaned it, changed filter, banged head against wall........am now 3,000 miles into a 10,000 mile trip and haven't used it once. It's also an exhaust restriction even when open.
I did find, too, that it doesn't always open all the way and EGT spikes can drive you crazy.........out of the truck and bang on it some more. I will NOT buy another one, but am going to do some research on others. Like to find one that isn't smaller diameter than exhaust.
Lar.
When working (??) it does do a very good job and saves the brakes very well. Very frustrating to hafta find a pull out to bang on the thing to open it. With it closed you will Not keep driving........I promise you.
Less than a year later - this spring - it jammed up again. Had it apart, cleaned it, changed filter, banged head against wall........am now 3,000 miles into a 10,000 mile trip and haven't used it once. It's also an exhaust restriction even when open.
I did find, too, that it doesn't always open all the way and EGT spikes can drive you crazy.........out of the truck and bang on it some more. I will NOT buy another one, but am going to do some research on others. Like to find one that isn't smaller diameter than exhaust.
Lar.
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Joined: Jan 2007
Posts: 478
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From: Castaic CA Winnemucca NV
I guess we could say that about the AC compressor, or the alternator, or the water pump, or the idler pulley, or the ??????? We still have them and use them and go down the road. I do carry both the stock serp and the one for use with the vacuum pump. Mine has been flawless in 70,000 and I use it even when running solo. Now if I could only figure how to carry a serp for no AC, or no idler, or no water pump - - oh wait a minute, that won't work. 
Bob
Bob
There's more than a couple of threads where the pumps locked up prematurely.
Doesn't matter to me I don't have one.
Now just how would you use that vacuum pump to fill your air bags?
Registered User
Joined: Nov 2006
Posts: 1,491
Likes: 3
From: Longmont, CO
Just another point to bring up. If you think you ever might want to upgrade the turbo you may want to opt for an inline brake. I did that, and if I choose to upgrade the turbo I can keep my $1k brake, all I have to replace is the downpipe and two $15 flange fittings to attach the brake. Turbo brakes are nice to install but they are turbo specific (or at least turbo flange diameter specific).
As far as getting a proportional brake vs standard, I have to say that my proportional BD with the simplest possible pressure valve - offset butterfly - works excellent at 1,600 rpm. I opted for BD instead of Pac just because of the inherent design simplicity, fewer parts = fewer parts to break.
As far as getting a proportional brake vs standard, I have to say that my proportional BD with the simplest possible pressure valve - offset butterfly - works excellent at 1,600 rpm. I opted for BD instead of Pac just because of the inherent design simplicity, fewer parts = fewer parts to break.
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Joined: Jun 2007
Posts: 51
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From: Kendallville,IN
rollover,,,I talked 2 dealer today on new vacum pump, my price was $821 so Im hoping when I call my local cummins dealer he can price one for what U gave,,if not I may want the dealer u dealt with there and order it from them. Mine was dealer installed in 04, 312k miles N took a royal dump last night 
Didnt realize how much I depended on it until it started to make ticking noise and brake quite on me.
thanx 4 the info
Didnt realize how much I depended on it until it started to make ticking noise and brake quite on me. thanx 4 the info
Banned
Joined: Feb 2006
Posts: 213
Likes: 0
From: Ca.
Call any Cummins parts counter and give them the part #.
They will even ship the thing to your door for a few $'s.
I realize that DC needs to make a buck or two, but there's a difference between a reasonable mark up and getting bent over. That said, just about anything Cummins can be purchased from Cummins or any other heavy truck parts counter. I use Franklin truck parts or Cummins.
BTW, a Cummins water pump is about $100.00 from Franklin.
Sorry DC
They will even ship the thing to your door for a few $'s.
I realize that DC needs to make a buck or two, but there's a difference between a reasonable mark up and getting bent over. That said, just about anything Cummins can be purchased from Cummins or any other heavy truck parts counter. I use Franklin truck parts or Cummins.
BTW, a Cummins water pump is about $100.00 from Franklin.
Sorry DC