SOLVED: Brake Pedal Goes to Floor – My Full Fix
Quote from ScanToolGuru on June 11, 2025, 10:02 am🚩 Symptoms:
Brake pedal went almost all the way to the floor.
Car still stopped but with very weak braking power.
No brake warning lights.
Brake fluid reservoir was full.
🔍 My Troubleshooting:
1️⃣ Checked for visible leaks at calipers, hoses, master cylinder — none found.
2️⃣ No fluid loss.
3️⃣ Bled brakes — no improvement.
4️⃣ Suspected master cylinder internal leak.🔧 My Solution:
Replaced brake master cylinder with OEM part.
Bled entire system properly.
Brake pedal firmness restored — no more sinking pedal.
📌 Root Cause:
Internal seal failure inside master cylinder — fluid bypassing internally without external leak.
🔧 Problem Status: Fully Solved ✅
🚩 Symptoms:
-
Brake pedal went almost all the way to the floor.
-
Car still stopped but with very weak braking power.
-
No brake warning lights.
-
Brake fluid reservoir was full.
🔍 My Troubleshooting:
1️⃣ Checked for visible leaks at calipers, hoses, master cylinder — none found.
2️⃣ No fluid loss.
3️⃣ Bled brakes — no improvement.
4️⃣ Suspected master cylinder internal leak.
🔧 My Solution:
-
Replaced brake master cylinder with OEM part.
-
Bled entire system properly.
-
Brake pedal firmness restored — no more sinking pedal.
📌 Root Cause:
Internal seal failure inside master cylinder — fluid bypassing internally without external leak.