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if its the rear brakes probably the hand break has rusted on or the breakes have seized take wheels off and tap the rear hubs with a hammer not to hard as you could break the drums if this doesent work check behind the hubs and drums to see if there is any movment of the hand break cable if not these have seized or rusted on try spraying wd40 or equivalent into drums to try and release them
if its the front breakes the pads will have to be removed and the front pistons in the calipers will have to be check making sure that they are still in the cylinder runners and haven't poped out which they can if the breakes are very worn down usually to the metal hope this helps ivan
Did you also bleed the rear brakes? Also try the gravity bleed method working from the right rear wheel, then left rear, right front, then left front. Be SURE to keep the master cylinder full at all times while bleeding.
Worn out seals in the master brake cylinder or air in the brake line or one or more brake shoes at a wheel are used up and the week brake cylinder is fully extending past it's usual travel length. Last thing is rear brakes may be out of adjustment. Try backing up several times applying the brakes to stop, this should adjust the rear brakes. Cars require maintenance.
I believe you have drum brakes on the rear of your Caravan, & it sounds like you have a wheel cylinder leaking, it will have to be replaced. This is what it looks like. Parts & labor to do a rear brake job should run around $220.00....Shop around and get a few estimates. Good luck, i hope this helps.
Start with brake in the rear that is the farthest away from the master cylinder ( if your master cylinder is on drivers side start with passenger rear,pump up brake pedal until hard have someone else open bleeder valve until air or fluid squirts out,while holding brake pressure even if goes to the floor dont release pedal until bleeder valve is tightened or you will **** air back into the line,do this several times making sure you get a full stream of brake fluid and no air,continue to other rear wheel and then proceed to front wheel furthest from master cylinderand then final wheel. if you still don't have brakes change master cylinder and bleed all brakes again.
To access you rear plugs, you need to disconnect the front top engine mount, then put the vehicle in neutral and pull the engine forward (with a large pry bar) and lock the engine to the mount base using the engine mount bolt. Don't forget to chock your wheels so the vehicle doesn't roll away. And really, the job isn't difficult at all.
IT IS POSSIBLE THE WHEEL CYLINDERS are wrong and need too much fluid to push brakes out. or rear shoes are not adjusted correct. this could be from drums too big(unlikely since new) shoes are not fitting to drum correct.You can take shoes off and set them in drum the whole shoe should contact drum sometimes just the ends contact. If this is case sand off ends of lining to make it fit .
If wheel cylinders are bad they would leak. might try a different brand of cylinders.