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Old 08-02-2020, 11:34 AM   #1
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Over Pressurization of front and rear suspension

I can be heading down the road at 60 mph and the pressure needles for front and rear suspension will peg at 150 psi I can tap the brakes and the pressure will drop to 135 psi sometimes it will stay there and sometimes it will climb back up
Where should I be looking
Thanks,
RT 41
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Old 08-02-2020, 11:44 AM   #2
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Quote:
Originally Posted by RT 41 View Post
I can be heading down the road at 60 mph and the pressure needles for front and rear suspension will peg at 150 psi I can tap the brakes and the pressure will drop to 135 psi sometimes it will stay there and sometimes it will climb back up
Where should I be looking
Thanks,
RT 41
May or May Not help -

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Old 08-02-2020, 12:02 PM   #3
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Quote:
Originally Posted by RT 41 View Post
I can be heading down the road at 60 mph and the pressure needles for front and rear suspension will peg at 150 psi I can tap the brakes and the pressure will drop to 135 psi sometimes it will stay there and sometimes it will climb back up
Where should I be looking
Thanks,
RT 41
I've not seen a rig with front and rear suspension gauges that peg at 150. So, I'll presume your front and rear air tank gauges are reading at 150. Tapping the brake uses some air out of the system and so the gauges go down. and they'll stay down until the pressure hits the cut-in point of the air compressor governor.

Normal air pressure in a system is 100 -120psi or at times it is recommended to as high as 130psi. 150 is too high for routine use. The governor is generally mounted near the air compressor on the engine. It has an adjustment that can be made to lower the pressure at which the compressor cuts out.

It is possible that your governor has been adjusted too high, or that it is malfunctioning. It should be checked and your pressure returned to recommended settings.
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Old 08-02-2020, 12:13 PM   #4
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The gauges are system pressure for all air components, not just suspension.

Bleed your air pressure down below 90 PSI and then start the engine.

As the air builds up above 120 PSI to 135 PSI, you should hear the air dryer unload ( blow out a burst of air ).

If you don't hear that and the pressure keeps climbing, you have a leak to the governor or a sticking governor. You must get this fixed.

The reason the pressure does not go above 150 PSI is there are pressure relief safety valves in the system to prevent the tanks from rupturing.
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Old 08-15-2020, 05:20 PM   #5
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Air Governor is your likely culprit.....inexpensive part...about $65 new or $25 reman from Bendix. Part is common to many heavy duty trucks.

Good tutorial on what air governor does..... https://youtu.be/9Vb32PL1PVU
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