Hi, this is Bo, an auto expert on RepairPal's Car Genius team!
You’ve replaced just about everything short of the steering wheel, and that brake pedal still feels like you’re stepping on a brick. Since you’ve already done the master cylinder, booster, vacuum pump, and even the ABS module, let’s talk about what might still be lurking in the shadows.
First, double-check the vacuum supply to the brake booster. Even with a new pump and belt, if the vacuum line has a leak, restriction, or check valve failure, the booster won’t get enough assist. A quick test: with the engine off, pump the brake pedal a few times to firm it up, then start the engine. The pedal should drop slightly if the booster is working properly. If it doesn’t, vacuum is still your issue.
Also, make sure the booster pushrod is properly adjusted. If it’s too long or short, it can cause a hard pedal and reduced braking force.
If everything checks out and it’s still not right, it might be time to bring in a shop with a high-end scan tool to look at live brake data—especially from the brake pressure sensor and ABS system.
If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.
