Failed servo

[daviespeter208212]

My local jaguar specialist ( not a dealership) is replacing the brake servo on my S type 2006 diesel, as they were not stopping the car effectively, he has also found a pump on the braking system to be faulty to.. The replacement of both has turned out to be very expensive. Question is, has anyone in the club had this problem, i don't know what the pump does in relation to the servo? Any advice and reassurance would be appreciated. Peter

[J44EAG]

I`m not familiar with diesels but I`d suggest the pump could be a vacuum unit rather than a pressure device. Vac is needed to help the servo pressurize the brake system and give you servo assistance....diesels can function rather differently to petrol models.

Mike K

[daviespeter208212]

Thanks Mike, that makes sense, the pump would provide constant vacuum when you take your foot of the gas, my braking effect was lost after the initial touch of the brakes. Its a fact you DO need good brakes on a car weighing two and quarter tonne, thanks again, Pete.

[rosemary]

Hello Folks
On the back of the engine is a vacuum pump on the 2.7d providing vacuum assistance to the Brake Servo and EGR valves, this doesn't go wrong very often.Unlikely failure of this, you'd have all sorts of EGR alarms up, or the Servo results in brakes that feel like putting your foot against a brick wall and terrible/dangerous braking function.
It is "Common" for the brake servo to fail especially on older cars of this vintage due in most cases to corrosion of it's internals. £400 pounds is a rough idea of a Booster unit replacement part, if you find a new one, of course there is also the Master Cylinder and tank connected to it and a load of Brake Fluid to bleed out. Fun really given that the repair by a Jag dealer will probably exceed the value of the car. I had this happen, did it myself after losing confidence in the Jag Specialist who didn't seem to have a clue and just quoted an amazing amount to have a look.
Dave

[daviespeter208212]

Hi, thanks Dave for your observations, it all adds background to the subject. Well its all good news as my car is back on the drive with excellent brakes. I also asked the garage (E&E Services) to check on the rear brake pipes as ive read these are prone to corrosion. All good no problems. I have to command them for a quick repair, as they had the car last Friday and fixed by Monday late afternoon. For future reference on this brake issue, i did request genuine Jaguar parts, and they came in at, brake servo £462.90 ;pump air £644.48, and a gasket at £4.68 .All plus VAT. Regards to all, Peter