Brake issues

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I'm sorry to hear you're having trouble with your vehicle. Since you've already replaced the brake booster and master cylinder on your F-150 but are still experiencing hard brakes and slow stopping, there are a couple more things to consider. One possibility is that there might be an issue with the vacuum supply to the brake booster. A weak or disconnected vacuum line can prevent the booster from working correctly, causing hard braking. Another potential issue could be with the brake calipers or brake lines themselves, as they may not be functioning properly and affecting braking performance. Checking for any pinched or blocked lines may help. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!