Check the power brake booster
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2007 Volvo V70, 2006 Volvo V70, 2005 Volvo V70, 2004 Volvo V70, and 2003 Volvo V70. However, it is still accessible from the selected car via links, so may be relevant.
Check if there is a vacuum to the power brake booster. Do this by removing the hose from the check valve.
Depress the brake pedal several times to so that it has no travel.
Hold the pedal down. Start the engine. The pedal should travel and feel softer.
Release the brake. switch off the engine. Wait 1 minute. Then depress the pedal. The pedal should still feel soft but should become stiffer when it is depressed several times.
Replace the power brake booster if the pedal feels hard and unresponsive when the engine is idling.
Replacing the power brake booster on left-hand drive cars. Power brake booster, replacing .
Replacing on right-hand drive cars. Power brake booster, replacing .