Rear brake assembly

Check this out, is for a 08 hilux but should be the same...

brake pedal sag to bottom after wading

The link above is a forum on the problem and some of the solutions they tried. Good Luck.

Have you tried at the rear of the cigar lighter panel?

the attached is a photos of drum brake assembly for your references.
Usually try not to used second hand parts and remanufactured parts, it may be a risk for you.
Based on safty consideration, we supply all kinds of quality new brake parts. feel free to contact us if any interest.
Regards

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The front brakes not releasing can only be restricted rubber
brake hoses & rusted caliper pistons,as well as rust on every sliding
surface & no lube, for calipers & pads

The rear is rusted & frozen parking brake cables

Master cylinder could be bad there's also a possibility that the valve that allows the separate front to rear fluid pressures is not working properly disconnect the line going to the front brakes at the caliper then have someone lightly push down and see if fluid comes out that way sounds like it could be a bad Master but it's not always the problem

Here you go! Please mark as solved and rate the solution. Thank you!

This link is what you need

http://media.photobucket.com/image/rear%20drum%20diagram%20for%2088%20toyota%204runner/tokeitup/Photos/brakes4.jpg

More than likely won't if equiped with Antilock system

Try this video . The part number is 118304, about $35