LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Volvo >> 2009 >> XC70 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electrical Modules And Components - Design And Function - 1 Of 5 >> Brake System (2008-2012) >> Design And Function >> Brake Fluid Reservoir With Level Switch
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Brake Fluid Reservoir With Level Switch

Fig 1: Identifying Chambers And Plastic Floats
GLL140719Courtesy of VOLVO CARS CORPORATION
  1. Chambers
  2. Plastic floats

The brake fluid reservoir comprises two chambers (1), one on each brake circuit, which are filled with brake fluid. In the event of a rupture in one of the brake circuits, only some of the brake fluid in the system can escape. The remaining brake fluid acts on the operating brake circuit.

The reservoir contains a level function for detecting brake fluid loss in the brake system. The plastic float (2) floats on the brake fluid. This closes the connector on the switch when the brake fluid level drops below the MIN level on the reservoir. The stop (brake) warning lamp lights on the driver information module (DIM). The float and the switch are integrated with the container and cannot be replaced.