Can a failed brake booster (or vacuum pump) cause a slowly sinking-to-floor brake pedal under sustained pedal pressure (with engine on only), and in detail, how? Assuming brakes otherwise work normally. -
![The Great Lotus Europa / Datsun F10 Master Cylinder Swap (Part 3: The Bleeding From Hell) - Hagerty Media The Great Lotus Europa / Datsun F10 Master Cylinder Swap (Part 3: The Bleeding From Hell) - Hagerty Media](https://media.hagerty.com/media/wp-content/uploads/2023/05/Hack-Mechanic-master-cylinder-swap-3-thumb.jpg)
The Great Lotus Europa / Datsun F10 Master Cylinder Swap (Part 3: The Bleeding From Hell) - Hagerty Media
![I have a 88 legend coupe. After the a/c has been on for about 30 minutes, the brakes lose pressure and the pedal will go I have a 88 legend coupe. After the a/c has been on for about 30 minutes, the brakes lose pressure and the pedal will go](https://www.justanswer.com/uploads/acuramstr/2009-03-08_072542_SHOT0403.jpg)