Hello Jag owners and lovers!
I own an '88 XJ40 3.6L. I spent the winter tinkering with and working all the little problems out of it and have enjoyed a summer of driving it in the Colorado sunshine! Recently I have noticed a pulsing fluid sound emitting from behind the dash above the brake pedal, that disappears when any pressure is applied to the brake pedal. From a little investigation I noticed the rhythm of the sound matched the movement of the high pressure hose coming from the hydraulic pump to the valve assembly. Being short on spare time I decided to take the car to the local Jaguar dealer for this repair. After 5 days and over $700 in parts and labor, I drove the car home still with the problem. The service technician recommended and replaced - relief valve (part no. CCC-3832 - $70) and high pressure switch (part no. CCC-3834 - $350). When these did not correct the problem, he threw up his hands and said there is little documentation on how to trouble shoot these cars and we would have to just keep replacing parts in the hydraulic system (which by the way are not returnable) until we find the bad part. The car has had the self-leveling suspension converted to non-leveling shocks, so the hydraulic system only runs the brake boost. I am hoping that someone has experienced the same problem and can point me to the cause and solution to the problem without costing me a small fortune 'trying' more parts.
Thanks in advance for any help or suggestions!