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Old 07-17-2018, 09:22 AM   #1
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Exhaust Brake

I have a 1998 36 SDS
when I flip on the exhust brake my tranny goes into 4th. I get lots of braking but isn't that just engine braking as in down shifting? I didn't think that was how an exhust brake worked.
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Old 07-17-2018, 09:31 AM   #2
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That is how mine works.
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Old 07-17-2018, 10:17 AM   #3
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Quote:
Originally Posted by TheKassman View Post
I have a 1998 36 SDS
when I flip on the exhust brake my tranny goes into 4th. I get lots of braking but isn't that just engine braking as in down shifting? I didn't think that was how an exhust brake worked.

Very easy to VERIFY:


Use the down arrow to 4th. Toggle exhaust brake on and off. Since the transmission is not a variable, you should be able to tell immediately, particularly if at higher RPM in 4th.
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Old 07-19-2018, 08:58 AM   #4
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From your description this is normal. In addition to Brett's suggestion, open your driver side window. You will be able to hear the change in exhaust sound as you toggle the PAC on then off.
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Old 07-19-2018, 10:13 AM   #5
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Be aware that PacBrakes DO require lubrication:


https://pacbrake.com/product/c18037-superlube/
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Old 07-19-2018, 10:23 AM   #6
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That is how an exhaust brake works, a lot of the braking comes from downshift.
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Old 07-19-2018, 10:27 AM   #7
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Exhaust brakes work better at higher RPM's, so the transmission is programmed to downshift to keep the engine near max RPM's.
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Old 07-19-2018, 11:23 PM   #8
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PAC brake

I have a 1998 Alpine 36FDS, the pac brake hasn't worked since I bought it 3 years ago. I took it to several diesel shops and they all wanted wiring diagrams before they would work on it. One Cummings dealer told me I should leave it off, because it was hard on the engine. Any thoughts from you guys on this and does any of you have any wiring diagrams to share on this?
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Old 07-20-2018, 06:25 AM   #9
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Rabbit48,


Have you/they verified that the brake is not getting the electrical signal at the air solenoid?


Said another way, that the problem is electrical and not mechanical at the PacBrake.



And, if it has not been used in 3+ years, quite likely it is mechanically frozen up even if the initial problem was no electric signal.


I would not be concerned with using an exhaust brake. Virtually all trucks with the 8.3 have exhaust brakes and they use them all the time.
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Old 07-20-2018, 07:48 AM   #10
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Came across this yesterday. You may find this helpful: https://pacbrake.com/wp-content/uplo...7/08/L5046.pdf
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Old 07-20-2018, 09:05 AM   #11
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Quote:
Originally Posted by Rabbit48 View Post
I have a 1998 Alpine 36FDS, the pac brake hasn't worked since I bought it 3 years ago. I took it to several diesel shops and they all wanted wiring diagrams before they would work on it. One Cummings dealer told me I should leave it off, because it was hard on the engine. Any thoughts from you guys on this and does any of you have any wiring diagrams to share on this?
Can you verify the signal to the Pacbrake while the coach is stopped. I don't have a wiring diagram to show how the signal is routed thru the transmission, accelerator, ect.
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Old 07-20-2018, 09:21 AM   #12
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Came across this yesterday. You may find this helpful: https://pacbrake.com/wp-content/uplo...7/08/L5046.pdf
Thanks for this. Reading it tells me the valve, in some applications, should close at idle rpm to help warm the engine. Start the motor, let air build, set PacBrake to ON, open engine cover and see position of valve actuator. If actuator is extended, valve is closed, PacBrake is working.
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Old 07-20-2018, 09:34 AM   #13
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Can you verify the signal to the Pacbrake while the coach is stopped. I don't have a wiring diagram to show how the signal is routed thru the transmission, accelerator, ect.

NO, I don't believe you will have an electric signal with coach stopped.


Remember, the exhaust brake cuts out as you approach idle so it doesn't kill the motor.


But, wouldn't be hard to rig a test light or voltmeter and have someone sit in back while you go for a test drive.


You could also disconnect the wire to the brake solenoid and (with coach air pressure built) apply another source of 12 VDC positive to it to verify that the brake works mechanically.
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Old 07-20-2018, 11:52 AM   #14
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Originally Posted by wolfe10 View Post
Be aware that PacBrakes DO require lubrication

This is why love reading iRV2, always something to learn ...
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