Patent Number: 8,577,542

Title: Method for detecting changes in the rigidity of a hydraulic brake system

Abstract: In a method for detecting air in the brake circuit of a motor vehicle having a hydraulic brake system that has a vacuum brake booster, the pressure prevailing in the vacuum chamber of the vacuum brake booster in the operated and the non-operated states of the brake is measured, and a parameter characteristic of the brake performance is determined as a function of the measured pressure, and the characteristic parameter is compared to a reference value.

Inventors: Stephan; Thilo (Heilbronn, DE), Kinder; Ralf (Backnang, DE), Mahnkopf; Dirk (Eglosheim, DE)

Assignee: Robert Bosch GmbH

International Classification: B60T 17/22 (20060101)

Expiration Date: 1/05/12017