Robert Boschgmbh

Carsten Thierer

Otmar Bussmann

Tim-Philipp Jesse

Rolf-Hermann Mergenthaler

Peter Ziegler

Kevin Wodrich

Erwin Reinke

In order to detect air in a brake master cylinder within a hydraulic power brake system, a brake master cylinder pressure on actuation of the brake master cylinder is compared with a comparison pressure which prevails in the brake master cylinder when it is air-free. For bleeding, brake fluid is conveyed with a power brake pressure generator through the in this case non-actuated brake master cylinder into a pressureless brake fluid reservoir, where air escapes from the brake fluid.

Detecting air in a brake master cylinder and bleeding the brake master cylinder of a hydraulic power brake system

For testing the functional capability of a hydraulic power vehicle braking system, a power brake pressure generator is switched on. The power brake pressure generator displaces brake fluid through the non-actuated master brake cylinder into a brake fluid reservoir, which is why no brake pressure is built up. A brake pressure build-up allows a 'hidden defect' to be inferred, which has no impact during normal operation and is therefore not noticed.

Method for testing the functional capability of a hydraulic vehicle braking system

Growing community of inventors

Abstatt, Germany

Carsten Thierer