Maverick2001

My buddy's dad has a BD EB that he took off of a 1998 12v that is sitting in his shop. Now my friend just bought a 1999 24v and we were curious if there was a way to make it work for the new truck. Thanks for any input you have.

totalloser

The biggest problem I see is the actuator. On the 24 valve there's a bunch of electronics to set up. A control unit goes under the dash, and the wiring taps into the TPS (APPS) sensor.

Other than that, I guess it's a plumbing issue. If it's an inline, it shouldn't be too hard, but if it's a turbo mount, you might need to use the 12v turbo.

On the 12v you need heavier exhaust valve springs to prevent valve float, but the 24v apparently doesn't.

I would advise caution.

Maverick2001

I figured the electronics would be the big issue. It is a turbo mount brake I was unaware they changed the turbo is the outlet larger on the 24v?

Thanks again

Homestead

The electronics are for the auto trucks if I'm not mistaken. <y 6spd has zero electronics other than the power on/off switch. The brake itself should be vacuum operated through a solenoid that gets it's power from the on/off switch.

I may be wrong, I'm just going by my own truck.

Jeff

Maverick2001

So is the pulley system the same from the 12v to the 24v? It would seem like if the butterfly valve will mount to the turbo and the pulley diagram is the same it should work then. By the way both of the trucks are 5 speeds. Thanks again.

Homestead

No I'm lost when you say a pulley system?

Mine is just a turbo mount butterfly actuated by a vacuum can on the back of it. 2 vacuum lines come from a solenoid that controls the vacuum in and out of the canister. The solenoid is for the most part controlled by the on/off switch I have mounted on my shifter. The vacuum itself is pulled right off the vacuum pump that came mounted on the truck, there is no secondary or accessory pump involved.

I know of a few 12v trucks that have the same brake installed as mine and I know there is no pulley system involved.

The only difference that I know of regarding BD's brakes is you need to install an exhaust valve spring kit on the 89 to 98 year trucks. Other than that I believe, they are all turbo mount vacuum actuated with the only exception being the AutoLoc electronics for the auto tranny trucks.

Jeff

Maverick2001

I was under the impression that the vacuum pump ran off of the engines pulley system with a longer fanbelt like the Jacobs. Is this not the case with the BD? Sorry for all the questions I've only installed the Pacbrake and I'm just trying to find out for my buddy.

torquefan

No, the BDs that I have installed worked off the engine's existing vacuum pump. I believe they used electronics on the 24 valve trucks to allow the exh. brake to engage when the throttle was lifted, but there is no reason you can't use the pedal-mounted switch that would have been on the 98.

Homestead

As Torquefan says, it runs off the existing vacuum pump, just "T" into the line and off you go.

I have the pedal mounted micro switch to operate the brake when you lift off the throttle to engage the brake. It also uses a regular dash mounted on/off switch to control power to the brake. OR you can use the optional shifter mounted switch (as I do) instead of the regular switch.

The shifter mounted switch gives you more control over the brake in regards to turning it off and on when at idle for example to help warm up the truck. The micro switch "turns" on the brake when the throttle is at idle per say. Any slight depression of the pedal will disengage the brake. When driving, if you lift off the pedal, the pedal will "return" to idle, the micro switch sees this and the brake engages. Touch the pedal and it goes off.

It's really a very simple system, pretty much fool proof. The micro switch on the pedal isn't really necessary, you can control the on/off of the brake with the power switch, in my case the shifter switch. I have the micro switch and when it does die, I will not replace it, I'll just use the shifter switch to control the brake manually. The beauty of this is as your down shifting, you can operate the brake in between shifts and not really have to touch the service brakes until you almost to a complete stop.

Hope it helps!

Jeff

Maverick2001

Thanks for all the input Jeff! One more question though, did you need the adapter for the down pipe?

Homestead

When I had my brake installed, I went with a 4 inch exhaust from turbo to tip so a 4 inch down pipe was installed.

But if I'm not mistaken, the brake replaces the factory elbow on the back of the turbo. It should just bolt in.

Jeff

Maverick2001

I was looking at the installation guide on BD's web site and it looks like the butterfly valve is the same and the differences are the electronics for the 24v and the adapter kit for the downpipe. but it should install like the 98. so it looks like all I need to make this work is the adapter for the downpipe. Here is the install guide http://www.dieselperformance.com/pro...ine_Brake1.pdf Does this sound about right?

torquefan

As far as I remember, the turbo, elbow, and downpipe are all identical between 94 and 2000, so I don't believe you will need any adapters there. You should be able to remove the elbow from the 99, bolt the brake in its place, then bolt the 99's elbow into the 98 to take the place of the brake. Somebody please correct me if I'm wrong.

Homestead

I think your confusing the adapter with the actual brake assembly itself. The brake assembly as a whole replaces the factory elbow off the back of the turbo.

Unbolt the exhaust, remove the elbow off the back of the turbo by removing the V clamp, replace the elbow with the brake assembly using the existing V clamp, re-attach the exhaust, your done the hard part. The rest is just vacuum lines and some minor wiring.

It's been awhile since I have looked at the install manual from BD and I see some changes. Page 15 is how mine is wired. The DVIS doohickey is new to me that they show on page 16. I believe that is so you use your cruise control with the brake. It was not an option when I had mine installed, I just turn it off with the shifter switch anyways. Besides, we all have enough problems with APPS on these trucks, I wouldn't personally want to plug anything else into it.

Jeff

Maverick2001

Thanks guys for all the help! I should be headed to Driggs this weekend to help install this into the 99. Again thanks a bunch for all the information.

Dave