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There is a proportioning valve and once the repair is done and you have bled all the air out of the system the valve should reset itself unless it is stuck. If it is stuck you may have to replace the valve assembly if you can't free it up.
The shocks have a air valve just like a tire valve, just take the cap off the valve and depress the insert in the valve to let air out.
The valve is in the oil filler tube. Remove the air hose from the air box to the intake. Take off the breather hose and the air box. Now you should be able to remove the PCV valve hose and the valve itself.
The proportioning valve is used to determine the amount of brake power to be distributed to the rear wheels by sensing the height of the bed (differences in rear weight) if replacing valve you should properly bleed air out of system. The valve is there for a reason it should not be bypassed.
brake proportioning valve is reading a problem for the brakes you can bleed rear brakes they might have air in them chck you rear wheel cyl. or unplug the wire to the valve near the master cyl.
Use the bleeder valve to bleed the system.
Remove the air hose running from your air filter box to your throttle body. There will be a small line going from your firewall into the fuel rail. About midway from the firewall there will be a valve stem, like you see on your tires. Unscrew the cap and depress the valve core, this will release any air trapped in the line and allow the fuel to flow.
air lock in the poportioning valve
After you remove the air filter cover, you can see the schrader valve. It looks just like the valve that you put air in on your tires.
look in how to bleed air off cooling system
Messy job, On the driver side you need to remove air intake assy and throttle assy to be able to remove the valve cover. On the passenger side, you have to remove the air intake plenum to get to the valve cover. Time consuming... but not impossible.
The EGR valve, on your 2005 Mitsubishi, is located beneath the air cleaner. Remove the air cleaner housing. The valve should be visible and labeled.