Is there a common problem with calipers leaking when new breaks are pushed in. Tjhis is what I have just been told by a mechanic who is replacing them now on my Focus 2007.

The brake system is a closed system, for this reason there are only two causes why there is no fluid on the reserve tank first there is a leak and second the brakes are wear out, if you already change your pads or shoes.you push back the fluid to the master cylinder tank, now if there is no a visible leak on the lines,calipers or cylinders,there is the possibility you have internal leak on the brake booster.

You are talking about the piston being pushed out? #1. Put a piece of wood in the caliper and push the brake pedal again.. remove the piston all the way. clean the caliper bore, replace the seal(caliper rebuild kit usually really cheap) carefully reinstall the piston.. sounds like it is either "cocked and stuck or the caliper has a ring of rust at the top of the bore. either way clean and reinstall the piston. possibilty #2. Take a "C" Clamp and force the piston back in.. if you do this take an old pad and put it between the piston and clamp to protect the poston.

fitting must be broken, if leak is from the broken fitting have it remove and replace with new one, fitting is called bleeder screw. if leak comes from caliper piston u may have to replace the caliper

you have to replace caliper and bleed line for air,after change.

Shane prowett could need flexible brake line...sometimes when changing calipers the flexible lines get stretched or twisted while removing or installing calipers, fluid will push the piston but won't return back to free rotors. Hope I could help ya with your troubles! -Andy Maze-

Something on the break system is leaking, maybe a pipe or even the caliper, every time you push pedal you are pushing the fluid out of the system. There are two types of pipes, a flexible and a copper one, check both for leak, take wheel off first. ( Put it on axle stands not on bricks)

replace the brake hub

Not hard at all. Just lift car, take wheel off. Spot the Caliper. Take the two guide pins (bolts) out and slide the caliper off the pads. Pull both old pads off and replace them with the new ones. Place brake grease on the outside of the pads where the calipers push on them or they will squeek badly. Use a C-clamp or a break tool (that you can borrow from AutoZone) to push the caliper piston back in so it will fit over the new pads (while doing this, watch the break fluid resivoir as you may need to take some out so it does not overfill). Then slide the caliper back over the pads. Place some grease on the guide pins and then put them back in. Then put the wheel back on.
Make sure you start the car and pump the breaks until you feel them grab again or you won't have breaks until they do.

If the pads and master are new, the only other place to look is to the calipers and brake cylinders. Did you properly bleed the system when you did the master? If so, the seals in the calipers are probably blown. This is quite common on older cars... the added pressure from new pads and a new master is sometimes enough to blow the seals in the calipers. They can be rebuilt on the cheap, but you'll need a qualified mechanic to do the work. If you want to do it yourself, I suggest giving autozone a call to see how much a new caliper will be. I suggest replacing the two in the front at the same time. You might check the rear drums (unless this is a GLI or Carat, in which case, caliper/rotor) to see if there are any signs of leakage. If it's leaking, replace it. You can also get calipers from the junkyard... Consider finding a Mark II Jetta or Golf that was wrecked. Then you know the brakes were probably working fine at the time of the wreck. A junkyard shouldn't charge you any more than $10 for a caliper. Hope this helps. Good luck.

well from reading of your problem, i am going to say its the calipers again, witch it could very well be, but there is something else it could be, There is a rubber break hoses that come from the hard line to caliper, there like a two way street fluid runs to caliper and back thru same hose, if there is a restriction or if it got kinked at one time it won't let fluid run back to resavor hence breaks don't release all the way and rub rotors and wear out pads. now calipers will do same thing. most of the time if there used and you squees the piston back in, when they come back out, like when you step on the break they will stick and not release or at least all the way and wear pads out prematurly. so my advise to you is this, new break hoses, new calipers and i think it will fix your problem. Hope this will help. OLD.SCHOOL.