hello guys I have a jag xf 2010 I wonder if anybody has experienced this' when I brake sudden my brakes are ok.but the longer my foot is on the brake pedal the less efficient my brakes on the car are the brake pedal goes hard to press.not sure if or when the brake fluid if at all has been changed any ideas many thanks the cars millage is 146300

hi

sounds like a dodgy brake servo, was a very common fault on the S-type Diesels

same engines and servos used in a lot of xf's

worth checking the vacuum hoses as well, just in case ones split

the S-type servos that fail, get contaminated with oil, which causes the diaphragm to fail

cheers

Joe

Many thanks joe for your reply and help Phil jervis

Hello joe you were right it was the servo thank you again pj