Jake Brake?
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Jake Brake?
Im not to sure what it is....but I think its something that causes the engine to automaticly downshift while braking? I tow a 25 foot enclosed trailer, so any braking is helpful....can anyone elaborate on the "Jake Brakes" and are they worth it/should I get one? Thanks!
Posting Guru
Joined: Oct 2007
Posts: 2,225
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From: Farmington, Minnesota
Im not to sure what it is....but I think its something that causes the engine to automaticly downshift while braking? I tow a 25 foot enclosed trailer, so any braking is helpful....can anyone elaborate on the "Jake Brakes" and are they worth it/should I get one? Thanks!
Here is Kwik's version of how to do it with your EBPV LINKY
Jake brakes are usually on the big rigs and make that loud rapppahhhhhh sound, they use the valves of the engine some how to do that, and are capable of producing more braking HP than RW HP
Lead Driver
Joined: Nov 2007
Posts: 5,578
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What he said... Also you can buy after market exhaust brakes from one of our great sponsors... like here BD Power - Product: Exhaust Brakes
or you can do what Jason suggested and turn you Exhaust Bake Pressure Valve (EBPV) into one heres a link on how to do that...
https://www.ford-trucks.com/forums/2...brake-mod.html
Good Luck and great explanation Jason
or you can do what Jason suggested and turn you Exhaust Bake Pressure Valve (EBPV) into one heres a link on how to do that...
https://www.ford-trucks.com/forums/2...brake-mod.html
Good Luck and great explanation Jason
Junior User
Joined: Jul 2005
Posts: 53
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From: Winchester, VA
The Jake term comes from Jacobs exhaust brake. They make models for almost every big truck engine. Simply hold the exhaust valves closed in timed intervals to increase pressure on the piston. This creates retarding horsepower by trying to stop the piston from pushing the exhaust gases out of the bore. When the valve is reopened, the gases have been pressurized and create a pop sound as they escape. The exhaust brake on the turbo is a completely different setup. It closes a butterfly valve to create backpressure on all pistons at once. I have them on my 00 and 01 psd's. They do help significantly, if you figure out optimum rpm's to use and downshift at. These brakes are worthless on automatics unless you downshift manually. Hope this helps.
Lead Driver
Joined: Jun 2007
Posts: 7,760
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From: Hampton, Maryland.
The Jake term comes from Jacobs exhaust brake. They make models for almost every big truck engine. Simply hold the exhaust valves closed in timed intervals to increase pressure on the piston. This creates retarding horsepower by trying to stop the piston from pushing the exhaust gases out of the bore. When the valve is reopened, the gases have been pressurized and create a pop sound as they escape. The exhaust brake on the turbo is a completely different setup. It closes a butterfly valve to create backpressure on all pistons at once. I have them on my 00 and 01 psd's. They do help significantly, if you figure out optimum rpm's to use and downshift at. These brakes are worthless on automatics unless you downshift manually. Hope this helps.
Posting Guru
Joined: Jan 2008
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From: Bridgewater, VA
Interested in this tune. What does it sound like Jason. Ugh must stop asking questions in someone else's thread 
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Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
No sweat Will. It sounds a lot like a jake break that is a little more muffled. You can hear the EBP valve close and there is a distinct sound that is like a grumbling noise. It works well and sounds good.
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From: Montana
The exhaust brake is actually VERY functional for automatics - I have the homemade version in my 95. I can tow a horse trailer down 4th of July pass and almost NEVER use the brakes.
I'll find the link and post it, shortly - LINK. That link is for the manual tranny. But, not far down the page he has a link for the automatic schematic.
As far as the sound it makes - that depends on what you have within your exhaust already (ie. muffler, cat, straight pipe, pipe size, etc.). Since the most of the "muffling" in our diesels is done within the turbo, you won't get that big BLAP-BLAP-BLAP you hear on the big rigs (sucks, huh?). I wish we did, too. But, you will notice a "smaller" version of it. Now that I have it installed, I couldn't imagine not having it.
I'll find the link and post it, shortly - LINK. That link is for the manual tranny. But, not far down the page he has a link for the automatic schematic.
As far as the sound it makes - that depends on what you have within your exhaust already (ie. muffler, cat, straight pipe, pipe size, etc.). Since the most of the "muffling" in our diesels is done within the turbo, you won't get that big BLAP-BLAP-BLAP you hear on the big rigs (sucks, huh?). I wish we did, too. But, you will notice a "smaller" version of it. Now that I have it installed, I couldn't imagine not having it.
Former Vendor
Joined: Mar 2006
Posts: 662
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From: Surrey, BC
The Jake term comes from Jacobs exhaust brake. They make models for almost every big truck engine. Simply hold the exhaust valves closed in timed intervals to increase pressure on the piston. This creates retarding horsepower by trying to stop the piston from pushing the exhaust gases out of the bore. When the valve is reopened, the gases have been pressurized and create a pop sound as they escape. The exhaust brake on the turbo is a completely different setup. It closes a butterfly valve to create backpressure on all pistons at once. I have them on my 00 and 01 psd's. They do help significantly, if you figure out optimum rpm's to use and downshift at. These brakes are worthless on automatics unless you downshift manually. Hope this helps.
Elder User
Joined: Mar 2003
Posts: 699
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From: northern Michigan
To my knowledge they don't offer a jake brake on the 7.3, but they do offer an exhaust brake. A jake brake holds a valve open on some cylynders to turn the engine into an air compressor when slowing down. On the big trucks you can select how many cylinders are used. My brother has an exhaust brake on his truck and it works quite well, but they are not cheap.
Hotshot
Joined: Jan 2008
Posts: 13,144
Likes: 11
From: Rochdale MA
Oh contrare mon frare...I have the decel tune on my DP and it utilizes the EBPV as an exhaust break, and believe me, it certainly does work and is nowhere near useless. Even unloaded, it works well to slow the truck down. It locks the TC and closes the valve and sounds good down to about 25MPH.