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Home >> Saturn >> 1997 >> SL L4-1.9L SOHC VIN 8 >> Repair and Diagnosis >> Brakes and Traction Control >> Hydraulic System >> Brake Master Cylinder >> Description and Operation >> Master Cylinder Description

Master Cylinder Description

OVERVIEW
The master cylinder is a dual circuit unit designed for use in diagonally split hydraulic systems. With a diagonally split system, the left front and right rear brake are on one hydraulic circuit, while the right front and left rear are on the other.

COMPONENTS
Threaded into the master cylinder are integral brake proportioning valves, which limit the fluid pressure to the rear brakes after a predetermined rear brake pressure has been reached. These valves are used to minimize the occurrence of rear wheel lock-up when the brakes are applied and the vehicle is lightly loaded in the rear.

A brake fluid level sensor, located in the brake fluid reservoir (attached to the master cylinder), is also provided. The sensor will activate the BRAKE warning lamp (located on instrument panel) should the brake fluid level become low. After the brake fluid level is corrected and a moderately high brake pedal force is applied, the BRAKE warning lamp should go Off.