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Old 09-15-2020, 06:53 PM   #1
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Exhaust brake

So my 2003 Cayman has an exhaust brake, and it seems to work when I activate the switch.

I noticed the other day that the exhaust pipe had cracked away from the turbo, so I removed the exhaust pipe to have a new flange welded on and ill also install a new V Band clamp.

Now, it seems to me that the PacBrake should be installed up against the turbo, but the outlet of the turbo goes straight to the exhaust pipe. But the exhaust brake seems to work when activated.

Am I missing something?

Photo of exhaust flange
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Old 09-15-2020, 06:59 PM   #2
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I don't think an 03' would have the exhaust brake built into the VGT turbo, but it's possible.
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Old 09-15-2020, 07:00 PM   #3
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Originally Posted by Socal18 View Post
So my .

Now, it seems to me that the PacBrake should be installed up against the turbo, but the outlet of the turbo goes straight to the exhaust pipe. But the exhaust brake seems to work when activated.

Am I missing something?

Photo of exhaust flange
Attachment 301184

Yup, that is where an exhaust brake would be located.


Check with your engine manufacturer-- you may have a Variable Geometry Turbo instead. Mostly similar in design-- blocks exhaust to create back pressure.
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Old 09-15-2020, 07:17 PM   #4
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They went to a exhaust brake as part of the VGT on the ISL model engine starting the 07' model year.
Maybe they went earlier with the ISB engine .
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Old 09-15-2020, 08:14 PM   #5
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Originally Posted by wolfe10 View Post
Yup, that is where an exhaust brake would be located.


Check with your engine manufacturer-- you may have a Variable Geometry Turbo instead. Mostly similar in design-- blocks exhaust to create back pressure.
I just double checked and it appears that I have a Holset turbo with VGT. Surprised that I have this on a 2003 coach. My owner's manual says it has a PacBrake, but no other info than that.

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Old 09-30-2020, 06:41 PM   #6
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I am having a similar problem. My exhaust cracked on the flange where it meets the PacBrake. The muffler shop can't fine one. It measures 3" where the flange meets the Pacbrake. I have a call into PacBrake to see if the can help. If anyone knows a source where I can buy one it will be deeply appreciated. I would have never believed such a small and what I thought would be a common part can be such a problem. I am kind of dead in the water until I fix this.

Thanks as always
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Old 09-30-2020, 07:42 PM   #7
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I am having a similar problem. My exhaust cracked on the flange where it meets the PacBrake. The muffler shop can't fine one. It measures 3" where the flange meets the Pacbrake. I have a call into PacBrake to see if the can help. If anyone knows a source where I can buy one it will be deeply appreciated. I would have never believed such a small and what I thought would be a common part can be such a problem. I am kind of dead in the water until I fix this.

Thanks as always
Phil
My flange is also 3". I bought the flange from Pure Diesel Power.

I don't know if this is what you need, but this is what I used, although I did have to modify it slightly.

https://puredieselpower.com/#/product/21746
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