Cause of spongy brake pedal

Hello, other than not knowing the quality of components as well as the ability to understand how they were installed - verifying proper installation - the next step would be to ensure all hydraulic components and the hydraulic system are fully bled properly. This includes bleeding the ABS system. I would suggest professional evaluation, as this concern is a major safety issue. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.