Engine/Transmission (1998.5 - 2002) exhaust brake hisses

[NIsaacs]

The add on vacuum pump was only used for the exhaust brake, however I have only seen them on the 3rd gen trucks. All the 2nd gens had one from the factory, gear drive off the accessory housing with the power steering pump bolted to the back of it. The early 2nd gens used vacuum boosters, HVAC and for 4x4 shifting. The later ones just had HVAC and 4x4.

Nick

 

[SnoKing]

Also when its on, in cold weather, it will help your engine warm up quicker. Kind of slows down the air in and air out scenario. And yes it will hiss then to.

I think it was more the load it placed on the engine to help it warm up quicker vs air in and air out.

And my Banks EB on the 2001.5 used the trucks OEM vacuum.

SNOKING

 

[petersonj]

All the 2nd gens had one from the factory, gear drive off the accessory housing with the power steering pump bolted to the back of it. The early 2nd gens used vacuum boosters, HVAC and for 4x4 shifting. The later ones just had HVAC and 4x4.

NIsaacs is right on here. I have run a total of 340,000 miles on one vacuum operated PACbrake (70,000 on a 99 Cummins, and 270,000 on my current truck). The factory vacuum pump is gear driven on both trucks and is bullet proof. Neither one has ever failed.

I learned early on to get rid of the hose clamps provided by the vendor and to install steel spring clamps on every hose connection. Since then, the exhaust brake has performed well and has been very reliable. I think using poor hose clamps gave vacuum operated exhaust brakes a bad reputation.

- John

 

[DenverPilot]

The add on vacuum pump was only used for the exhaust brake, however I have only seen them on the 3rd gen trucks. All the 2nd gens had one from the factory, gear drive off the accessory housing with the power steering pump bolted to the back of it. The early 2nd gens used vacuum boosters, HVAC and for 4x4 shifting. The later ones just had HVAC and 4x4.

Nick

I'll have to look closer and see what the heck is going on under my hood then. Haha. Seriously. Thanks.

Seems like all the folks saying to bypass it would be causing a brake problem on the older ones. Not great advice while towing, that's for sure. Weak brakes and no exhaust brake. There's a great recipe. Wow. I could see bypassing it if it's only handling HVAC doors and 4x4 though.

Thanks again. Weird. I swear mine has it on a pulley on the right side ... maybe it's been retrofitted on there. Too dark to go look right now but I'll see tomorrow. Maybe mine's an oddball.

 

[NIsaacs]

I'll have to look closer and see what the heck is going on under my hood then. Haha. Seriously. Thanks.

Seems like all the folks saying to bypass it would be causing a brake problem on the older ones. Not great advice while towing, that's for sure. Weak brakes and no exhaust brake. There's a great recipe. Wow. I could see bypassing it if it's only handling HVAC doors and 4x4 though.

Thanks again. Weird. I swear mine has it on a pulley on the right side ... maybe it's been retrofitted on there. Too dark to go look right now but I'll see tomorrow. Maybe mine's an oddball.

I think you have been confused by too much reading and now you are confusing us

You need to look at your truck really good and see what you have. It has never been possible to by-pass a 2nd gen vacuum pump. Like I said, they are gear drive and also turn the power steering pump.

The 3rd gen add on vacuum pump for the exhaust brake could be by-passed by removing the belt and installing the oem belt so you still have all your accessories, fan, power steering pump (the 3rd gen was belt drive), water pump, alt. and AC.

Nick