The picture under your avatar shows you driving through muddy water. This activity alone will introduce grit to the brakes - make sure you hose down the brake calipers and discs thoroughly after 'fording'. When you get a nice afternoon off, jack her up very safely and take off the wheels. Note: the wheels can stick to the hubs like glue, so you'll need a mallet or small sledge hammer on the tires to dislodge the rear wheels in particular. Check out the pads and discs for condition and amount of wear. If everything looks good, make sure the pads are good quality not the crap $15-a-pair ones available these days.
Replacing the front and back pads is child's play if you have the older design Girling brakes. If the brakes have antirattle springs, make sure they are in place. Always spray off the discs/pads front & back with brake cleaner to remove any oil or grease that is present just before remounting the wheels.
Listen for your squeak to return.... If the squesk returns after driving a few days, you probably have a 'glazed' surface on the discs. This is easy to remove with a small grinder and #250 sanding disc. Don't have the discs machined unless they have deep grooves...
Cheers - remember, you have a specialty vehicle that needs lots of attention, it is not a Toyota.
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