C0299

Brake Booster Performance Plausibility

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–222 (est.)

Symptoms

Hard brake pedal
Increased brake pedal travel
Reduced braking performance
ABS/ESP malfunction indicator is on

Causes

Vacuum leak in the amplifier system
Vacuum pump malfunction (on diesel engines)
Depressurization of vacuum hoses
Amplifier check valve failure
Malfunction of the pressure sensor in the amplifier

How to Fix

Check the integrity of vacuum hoses and connections
Check the operation of the vacuum pump (on diesel engines)
Check booster check valve
Diagnose pressure sensors and control circuits
If necessary, replace the vacuum brake booster

Related codes

C1214 C1215 P0519