Brake pedal may feel hard during cold start at high altitude on Honda Civic Si

Problem Description and Possible Solution

On some models with automatic transmissions, during a cold start at high altitude the brake pedal feels hard. Replacing the power brake booster and updating Powertrain Control Module (PCM) the with a Honda software update is needed for this issue.

Problem Data
RepairPal Verified
Average mileage: (–)
4 model years affected: 2007, 2008, 2009, 2010
4 people reported this problem