* Incorrect Installation: The most probable cause is improper installation of the replacement bracket. Was it installed correctly, aligning perfectly with all mounting points and using the correct fasteners? A slight misalignment can put significant strain on the bracket, leading to failure. Double-check the installation instructions and ensure all bolts are tightened to the manufacturer's specifications.
* Bent or Damaged Pedal Assembly: The pedals themselves or their linkages might be bent or damaged, causing them to bind or apply excessive force to the bracket. Inspect the pedals carefully for any bends or signs of damage. Check the linkage connecting the pedals to the master cylinders. Any binding or stiffness in the linkage will put stress on the bracket.
* Master Cylinder Issues: A problem with the master cylinders (brake or clutch, or both) could cause excessive force to be applied to the pedals. A sticking or binding master cylinder would require more force to operate, putting stress on the bracket. Have a mechanic inspect the master cylinders for proper operation.
* Vacuum Leak (Brake Booster): If the issue is with the brake pedal, a leak in the brake booster vacuum system can make the pedal feel spongy or require excessive force to stop the vehicle. This added force puts strain on the bracket. Have the vacuum system checked for leaks.
* Hydraulic System Issues (Clutch): If the problem is with the clutch pedal, look for problems within the hydraulic clutch system. Air in the lines, a leaking slave cylinder, or a worn clutch master cylinder will make the pedal feel hard and put excess force on the bracket. Bleed the clutch system and inspect the slave and master cylinders.
* Underlying Chassis or Body Damage: While less likely, previous damage to the firewall or floor pan where the bracket mounts could be weakening the mounting points, causing premature failure. This would require a thorough inspection of the chassis.
Recommendation: Don't install another bracket until the root cause is identified and fixed. Taking your car to a qualified mechanic is strongly recommended. Explain the issue clearly, emphasizing the two bracket failures within such a short timeframe. They'll be able to diagnose the underlying problem and prevent further expensive repairs. Ignoring the root cause will likely lead to more bracket failures and potentially more serious issues.
