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Old 05-02-2007, 01:31 PM   #1
gary85 is offline
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PacBrake has an upgrade (PRXB) to increase exhaust braking in the rpm mid-range. Has anyone installed this upgrade? What do you think of it?

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Old 05-02-2007, 01:31 PM   #2
gary85 is offline
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PacBrake has an upgrade (PRXB) to increase exhaust braking in the rpm mid-range. Has anyone installed this upgrade? What do you think of it?

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Old 05-06-2007, 05:04 PM   #3
Diplomat Don is offline
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gary85...I was going to have one insalled at Quartzsite, pulled in for my appointment, but they didn't have one in stock.

I'm glad they didn't. I did a little more checking and found that they really only work at low RPM by blocking off the remaining hole in the PacBrake plate. If you're like me, I wanted more braking at 55-60 mph. The new unit only helps at low speeds. I have enough braking at low speeds. Hope this helps.
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Old 06-19-2007, 02:43 PM   #4
gary85 is offline
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I went ahead and installed the upgrade. Actually, it is a whole new unit. It works! There is a noticable difference in the mid (45 mph) range and lower.
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