2005 Jag S-type brake problems

[john493]

A friend has inherited an S-type 3.0 auto, 2005, low miles from an elderly owner who has not used it much & now given up driving. The car is worth little ££, so I'm trying to help fix a brake problem without over-spending on it.

After MOT it drove OK, but now after very few miles since MOT, the brakes are binding; the brake pedal does not fully return after braking & the brake lights stay on. Pull up the pedal manually & the brakes fully release. The return spring on the brake pedal is working. So, with the front right wheel raised, I loosened the nuts holding the master cylinder to the servo and the brakes released; the wheel which had been locked was turning fine. So it would seem that something in the servo is holding the brakes on.

I removed the servo from the car to inspect it & could not see anything wrong. I press the input pushrod fully in, then release & the spring in the servo returns it fully to the starting (brakes off) position. If the servo is faulty, I'm quite happy to buy a replacement. But at present, I'm not certain the servo is faulty. There are some signs of brake fluid leaking from the bore of the master cylinder, but minimal; I cannot see any fluid in the servo, although view is limited.

Any ideas welcome.

Thanks

John

[x type]

have a read of these 2 , no guarantee its the exact same problem

https://www.jaguarforum.com/threads/brake-pedal-do...

and

https://www.jaguarforums.com/forum/xj-x351-53/brak...