Has anybody saw the exhaust brake that is currently being offered on ebay Item# 8059802231? It is a Cummins/Jacobs kit#4089656. Does anybody know if this will work on my truck after I get that 47RH with the lock up torque convertor installed?.... (Special thanks to JD730 and wannadiesel for their great help in what I needed!).......I have my exhaust right after the turbo adapted up to 4". I called and the guy that has this e brake listed on ebay tells me the inlet is 3", and the outlet is 4". Is anyone familiar with this particular e brake. If it can physically be made to fit in my exhaust system, what else would I need to make it work other than a switch to activate it? Does it have an actuator with it or is that something that has to be bought seperate? Is it controlled by electric or vacuum? Basically does anybody have any recommendations? I don't really need a complete kit that bolts right up. As you can see from the photos of the truck, I can cut, weld, and/or modify whatever to make it fit my truck as needed. I just need to know if something can or will work before I buy it.

Thanks, Scott

 

That's gonna be a tough one to make work unless you have onboard air (or you feel like adding it). It's air actuated because the ISC and ISL are run in class 7 and 8 trucks. It looks like they have not included the air solenoid. You will also need an idle switch to turn the solenoid on and off, in the ISC/ISL applications the ECM will do that.

I'd be real surprised if that has a 3" inlet, the turbos on those trucks have a 4" flange. Regardless I'm sure you can get it to physically fit in place.

You might want to find out from Jacobs what the rated backpressure is on that brake as well. The 5.9 is only rated to 60 psi provided you have installed the HD valve springs on the exhaust valves.

 

I do have on board air with a compressor and an 8 gallon holding tank for my air bags on the rear axle. I am also aware I will have to install the 60 lb exhaust valve springs. What are the differences between the various manufacturers brakes. Is the US gear in line brake a good choice? I know there are a lot of threads on here that already address this topic, but there more I read about it, there more confused I become. I think I would like an in line 4" exhaust brake with the actuator , and then I will wire it all myself since it will be not be ran through the ecm wiring.

 

I haven't seen the e brake, on e-bay, but if it's the one used on the 24v and common rail cummins, it uses an add on Vac. pump to actuate the "brake" valve.

 

Well, having air already simplifies things a lot! Find out from Jacobs what the backpressure is on this one and jump on it if it stays low. I wouldn't want to pay more than $300 for it due to the custom work required to fit it. Your time is worth something. The backpressure is set by an orifice in the butterfly and can be fine tuned by adjusting how close to completely closed the butterfly sits when "closed". The engines this brake was made for are bigger, but they run about 1,000 RPM slower than the 5.9. My gut tells me this brake will work OK.

I have not read about anybody who didn't like their exhaust brake no matter what brand (besides people with non-lockup converters). There a really only two types of brake out there - orifice and spring. Spring-type brakes develop constant backpressure above 1500 RPM or so. This gives much better braking in the midrange. The orifice brakes don't hit max backpressure until 25-2800 RPM. This could mean the difference between the truck holding 60 on a hill or pushing 90. There is no difference between the two types over 2500 RPM. The only spring brakes I know of are the BD brake, the PacBrake PRXB series, and the US Gear Super Duty D-celerator. All the others are orifice brakes.

 

Is there a lot of difference between the noise of an engine brake vs. an exhaust brake? It seems to me an exhaust brake would be quieter.

 

On a truck with a muffler the exhaust brake just hisses. You get a little bark out of a straight piped truck, but it's nowhere near the sound of a "real" jake brake.