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If I recall correctly you can often rebuild the brake junction box for very little money. You just need two o-rings for the piston that slides back and fourth. There is also a little switch rebuild kit from Volvo that renews the electrical contact part along with its small o-ring to seal.
Opening the switch is easy because you just need to unscrew one of the end caps and slide the middle part out that contains the o-rings. When reinstalling the middle part I would at least try to make sure that it is centered in its travel so that the fluid pressure does not have it move it too far once things are working.
Best,
Mike
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