1998 Honda Accord tires problems

Had 4 tires and valve stems on a 1998 honda accord replaced in april of 2007 at gold coast auto center. In september of 2008 the first valve stem failed. Luckily I noticed the tire was continuously getting low only when the car was driven at highway speeds and was able to get the stem replaced before it caused a crash. The second stem failed in december of 2008, again while driving at highway speeds. In a water bath, the stem only leaked when it was flexed toward the outside diameter of the wheel.

Front tires started shaking and didn't know which one. Tread separated from the tire at 73 MPH one the right side front, causing the right front fender to collapse plus other damage in this area. Tires were bridgestoneturanza h revo p205/65r15 92h on a 1998 honda accord sedan. Tires replaced. Tire available at dealer. Front end damage ($1800.00) pending results from firestone/bridgestone office.