Why is my brake pedal very low I changed the booster and brake pads?

Answer 1

Once you have replaced the booster and the brake pads and your brake pedal is still very low, then there are some possible explanations of the problem. Air in the brake lines is one of the widespread causes. When any kind of brake work is performed--particularly the booster or brake pads--it is important to bleed the brakes correctly to get rid of all the air in the system. Bubbles in the air will decrease hydraulic pressure causing soft or low brake pedal.

It may also be due to a bad master cylinder or a worn out master cylinder. In case the seals within the master cylinder are punctured, it might fail to generate sufficient pressure, despite having the new booster. Ensure also that the brake fluid-level is full and that the system is not leaking.

Poor pedal response can also be as a result of improperly adjusted or installed brake parts, e.g. misaligned pads or calipers. The installation should also be re-checked and everything kept in the right place and torqued accordingly.

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Answer 2

A low brake pedal can indicate air in the brake lines, which can occur if the system wasn't properly bled after replacing components. Additionally, it could be due to a worn master cylinder or issues with the brake fluid level. Ensuring all connections are tight and checking for leaks can also help diagnose the problem. If the issue persists, it may be wise to consult a professional mechanic.