V70 XC AWD L5-2.4L Turbo VIN 56 B5254T (1998)
Check the function of the check valve.
Start the engine.
Remove the check valve from the power brake booster.
Check that there is a vacuum. Feel the check valve.
Reinstall the check valve.
Press the vacuum hose. Listen for a leak. Replace the rubber bushing if there is a leak.
Switch off the engine.
Note: Replace a defective check valve.
Check the function after replacing 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.
Replacing the vacuum hose
Remove the air cleaner (ACL) housing
See Brake pipe Master cylinder / ABS unit-replacing.
Remove the check valve from the power brake booster. Remove the vacuum hose
Pull out the check valve.
Remove the hose from the intake manifold.
Pull the hose forwards between the bracket for the ABS hydraulic modulator and the side member. Replace the part of the hose which is damaged.
Transfer the check valve to the new hose section.
Install the vacuum hose