Engine/Transmission (1994 - 1998) exhaust brake difference 94 to 98.5

[vaicase]

why is it i can find a exhaust brake for a 98. 5 to 02,but not a 94 with a 5-speed?whats the difference if i have a stick?i dont need to hack into the commputer,or do i?pac brake has one at tst but its confusing as to what fits,it says the auto and sticks are the same how can this be?i would like a inline one. i mean in the pipe after the turbo pipe. anyone know of a company that has one?also does it come with a compresser?or how does it acctivate?thanks very much. i nedd one bad my brakes suck. thanks

 

[Coalsmoke]

If your brakes suck, an exhaust brake won't solve those problems. However, call Pacbrake at 1-800-663-0096 for their exhaust brake info.

 

[Howard Durand]

Coalsmoke is right, the E-Brake assists the vehicle brakes under certain circumstances but won't compensate for a poor brake system.

I have one I bought from Cummins when they became available. They were recalled later when DC decided they voided the auto transmission warranty.

I kept mine because I figured that DC's warranty is mostly BS anyway.

The brake is operated by vacuum tapped from the trucks system. It is controlled by a microswitch that is actuated by throttle position.

There are a number of exhaust brakes available. I assume they are all in the exhaust system following the turbo. Some attach directly to the turbo outlet and some are further back. I think there are better ones than what I have but mine has served me quite well.

 

[Joe G.]

I don't know why the automatic and manual exhaust brakes are different. My Pacbrake has a different part number than the one for a manual. You might ask Pacbrake about it. There are exhaust brakes that install in the exhaust pipe instead of the elbow. I'm not familiar with them. Camping World stocks some so you might check there. I think one brand is Gear Vendor.

 

[hsmith]

I have the complete Jacobs unit off my '96. Went with a bigger turbo and the e-brake would not bolt up. Had to go with a inline unit. BTW, the Jacob's unit is for sale. Fits all '89 thru '97 models.

 

[vaicase]

accually my brakes are pretty good. but i have an 06 with four wheel disc brakes and its night and day. sorry for saying they suck. but four wheel discs are a lot better. thanks

 

[Howard Durand]

If you are towing anything substantial, an exhaust brake is well worth the cost.

 

[JFaughn]

I thought I read some thing a while back that there were some advantages to the inline , I'm looking to add in future after auto [ 47RH ] upgrade [ Georands ] .
Anybody know what the advantages / disadvantages are ?

 

[Driftwood Ram]

I thought I read some thing a while back that there were some advantages to the inline , I'm looking to add in future after auto [ 47RH ] upgrade [ Georands ] .

Anybody know what the advantages / disadvantages are ?

IMHO the advantage to an inline is if you want to change your turbo to one that uses a HX-40 down pipe, you do not have to buy a new e-brake.

This is where I am at now. I have new injectors that are still in the box because I am still trying to scrape up the $$ to change both the turbo and the e-brake.

Get a inline and do it once!!!

 

[JFaughn]

Ya that was my thought , but what I was asking [ & forgot to ask specifically ] was performance of the ex-brake ?

 

[Bart]

accually my brakes are pretty good. but i have an 06 with four wheel disc brakes and its night and day. sorry for saying they suck. but four wheel discs are a lot better. thanks

I have a Pac brake available that is for a 3" exhaust and bolts up right behind the turbo on my 98 12 valve. I don't see any difference between an auto and stick. The switch is right under the fuel peddle and taking your foot off it sends 12 volt power to a switched vacuum valve that pulls the butterfly closed. For the life of me I don't know why there should be a difference between the two trans. My auto is an ATS and it stays locked up until 18 mph on decel. It helps me a LOT on braking. I normally don't touch the brake peddle until that 18 mph point where the torque converter unlocks and the engine/trans seperate. If you're interested in mine let me know.

 

[Loren]

vaicase,



I have been happy with my US Gear Decelerator exhaust brake. It mounts in the exhaust pipe and is electrically controlled and electrically operated (solenoid).



It does require large wires (10 gauge) to the brake to support the current draw as it closes (turns on).



I've had two issues with this unit since I've owned it -- about 12 years. First was a failed relay. It caused the pull coil to remain powered, and the circuit breaker would trip, then reset, then trip, etc. The exhaust brake would close, then open, then close, etc. until I turned it off. This was repaired by replacing the faulty relay.



The other issue was intermittant operation after about six or seven years of use. That turned out to be corrosion on the butterfly valve pivots. I took the brake apart (simple job), lubed the pivots with anti-seize, and re-installed the brake. That was several years ago, and I haven't had a hint of a problem since.



As I said, I've been very happy with my US Gear unit. I recommend it.



Loren

 

[JFaughn]

Still looking for performance difference between inline / turbo mount , & brands .
Thanks

 

[Pacbrake]

Hello all, I'm Harold with Pacbrake, (I know its been a long time coming to have a Pacbrake tech on here) I'm here to answer any and all questions regarding exhaust brakes, Our Levelling kits, Remote Oil Filter Relocation Kits, and Air Bag suspension systems.



The auto Trans was on the weak side when it comes to building backpressure so we changed the orifice size in the butterfly to help compensate for the transmission. You can now get the PRXB Inline version with compressor and tank for the older trucks in 4” and 5” depending on your exhaust size. You must have the heavy duty valve springs and Lock-up the torque converter for it to be of any use

 

[JFaughn]

Hello all, I’m Harold with Pacbrake, (I know its been a long time coming to have a Pacbrake tech on here) I’m here to answer any and all questions regarding exhaust brakes, Our Levelling kits, Remote Oil Filter Relocation Kits, and Air Bag suspension systems.

The auto Trans was on the weak side when it comes to building backpressure so we changed the orifice size in the butterfly to help compensate for the transmission. You can now get the PRXB Inline version with compressor and tank for the older trucks in 4” and 5” depending on your exhaust size. You must have the heavy duty valve springs and Lock-up the torque converter for it to be of any use

Do you know of any performance difference between the inline & turbo mount ?
thanks

 

[Doubleclutch]

vaicase- I had a 96 with a 5 spd- and found myself in your shoes. PROBABLY... your rear brakes are just going along for the ride. Check to see that they are participating in the speed reduction process.



I bought a turbo mount pac-brake that was marked "for AUTOMATIC TRANSMISSIONS... if you use it on a manual transmission, we will take away your birthday AND eat your lunch!" Of course, that got my attention. Since this was PRE-PRXB days, this brake had an orifice in the butterfly that was sized for... . and automatic transmission. For a five speed, guess what... "just drill it out to X/X inch and you'll be all right". I did, and I was. DON'T FORGET TO REPLACE YOUR EXHAUST VALVE SPRINGS TO THE 60# SPRINGS!!!!

Greg

 

[Pacbrake]

Do you know of any performance difference between the inline & turbo mount ?

thanks

There is no diffrence, unless your looking at a fixed orf vs a PRXB

 

[JFaughn]

There is no diffrence, unless your looking at a fixed orf vs a PRXB

Could you explain that ?
Thanks John

 

[Pacbrake]

A fixed orifice direct mount vs. a fixed orifice inline exhaust brake the backpressures are both the same at 60# of backpressure, the fraction of a second difference it takes to build up to 60 pounds between the two is almost unreadable. The biggest factor between the two brakes is mounting/installation ease. With a direct mount exhaust brake you are up out of the road spray area this will protect the brake from the road elements. An inline brake (Pacbrake (only) is Arcor nitrited to protect from the elements) is designed for the various size exhaust systems to prevent the loss of any performance advantages you've gained by adding a 4” or 5” exhaust system. With ether brake as your RPM start to drop off at around 1750 to 1800 the brake fades away resulting in a lack of braking performance. This is the result of the orifice within the butterfly being a fixed diameter.



The Pacbrake PRXB both Direct mount and Inline models are still Arcor-nitrited to prevent corrosion and carbon build up. Where the advantage is now, the orifice with in the butterfly spools down to maintain the constant 60# of backpressure right down to 1200 RPMS. Our tests have shown that the PRXB brake will slow a 15,000# dodge truck and trailer at 50 mph on a 5% grade to 20 mph, five football fields sooner then a fixed orifice brake (yes that's 1500 feet difference between the two brakes) Hope this helps, feel free to call me for further information.

 

[JFaughn]

Is the PRXB available to match the 4" exhaust ?