I have the following problem and I am in despair! My camper no longer has any brakes …. The workshop is baffled and I go under financially if the error is not found. The workshop changed brake pads, brake drum, brake jaws and brake cylinders and the brakes are ventilated. Because of the service life the caliper would not brake properly what should lie down with the time… (so the workshop) The test drive has shown that the car pulls to the left when braking. Today it has rains and on the wet road at 30 km/h I made a test brake. Surprisingly: Only the left front wheel has braked. At this time only the front wheel is braking left!!! Now the workshop says I should buy a new caliper…. Can any of you please give me a hint??? What can be the reason if only one wheel is braking?? How do I recognize a defective main brake cylinder? How do I recognize a defective brake booster? How do I recognize a defective brake booster? Brake caliper?