My 96 xj is having an interesting problem. The left rear wheel makes a distinct squeaking sound only when taking your foot off of the brake. Could it be a bad brake cylinder hanging up ? I had the rear shoes replaced about a year ago and have put on maybe 5k on it. The xj has also developed a knocking sound from the rear, maybe a u joint ? I dont know what it could be. The final issue I have is that the XJ has been having some bouts of severe hesitation almost to the point of stalling. I have never changed the fuel filter and I was thinking that this could be the culprit. Any ideas on these issues would be great. I appreciate everyones input.