Help! We have a 2002 Nissan Quest that had a motor mount replaced. After returned to us, the check engine light came on within a day or so. Told it was an O2 sensor/knock sensor. Shop kept for some time with another problem being a hose that they said was reason for knock sensor. Also broke bolt- took more time for part to come in. Brakes started failing once returned. Took back again & they tightened bolt for vibration. Still had brake issues. (All dx done by same repair shop). The brakes continued to get tighter and if pumped you could hear air leaking loudly (like a balloon leaking air) until the pedal was close to floor. At that point you could still hear air leakage but it sounded quieter and more steady. The brakes were getting harder to push, as well.

(Like all my strength to get it to stop. At first, seemed like in reverse was when the pedal was hard to push but then became hard to push often, if not most of the time.) Had friend of a friend check & they said the brake booster was torn. Could these things be related? Unsure if repair shop could be responsible.

Car needed motor mount done for 2 yrs but was running fine until we had this done.

Thank-you so much for your help! Also...leakage of antifreeze- all over back side of engine

after we got car back for last time.