Thanks for your reply Pepe.......

The brake warning (low pressure) does go away when the engine is started as
expected so nothing wrong with pressure... but i do not get any ABS warning
display when i turn ignition on before starting the engine.

your XJ40 94 has different pressure system (Teaves)

jon
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Pepe,
  Your 1994 XJ40 is a totally different animal than the 1987-1989 XJ40. It
has different brakes, different ABS, different engine, different
electronics.  They just look a lot alike!!!

   The '89 XJ40 has 4 different warnings for the brake system. All 4 are
those HUGE obnoxious warnings that come up on the right side in the display.
They all have the Exclamation point with the circle around it.  They are as
follows:

"Anti Lock Failure"  This means that most likely one of the sensors has gone
out. The sensors for these cars, located in the top of each wheel hub need
to be removed and cleaned on a yearly basis.  They are stainless steel in an
aluminum housing and in conjunction with salt and other road crud, they will
eventually lock in place and form weird electrical signals.  Taking them
out, cleaning them and using a light grease when they are re-installed will
avoid all that.  The ABS computer will also throw this warning as will other
areas, but if you are not getting the warning -- don't worry about it.  It
is a complicated system.

"Low Brake Pressure"  This means that the "Green Blood"  commonly known as
HSMO (Castrol Mineral Oil) that is in the Green reservoir is low or the
accumulator is gone or the pump is shot.  9 times out of 10 it is the
accumulator. Unlike the 1990 Teves system which has an electric pump, the
pump on the '87-'89 XJ40 is engine driven and mounted on the front of the
engine. The pump RARELY goes out.  It is normal for this warning to appear
when you first start until the pressure builds. It should then go away.
Keep in mind that if you are restoring this car back to original than the
HSMO also runs the Self Leveling rear shocks and they go out ALL the time
thus sending up this warning continuously.

"Brake Pad Low"  This is self explanatory -- for the most part. Again,
unlike the 1990+ XJ40, the '87-'89 has a pad sensor on all 4 wheels, not
just one in the front and one on the rear.  The wires on these pads are
fragile and it is common for new pads to show the warning within days of
installation. If this happens, the choice is to buy new pads because you can
not remove and replace the sensor or you simply wire the sensor wires for
the offending sensor together thus completing the circuit and make the
warning go away.

"Brake Fluid Low"   This is the most serious of the warnings. This means you
have a problem with the hydraulics (brake lines) on the car.  You need to
determine exactly why this warning is appearing sooner rather than later.

While on the subject of fluids, keep in mind that the '89 XJ40 uses
Automatic Transmission fluid (ATF) for the power steering -- not Power
Steering fluid like most cars and not HSMO like some of the later XJ40s.
Check to see if the reservoir is full of red fluid or not.  In my case,
since I have teenagers that drive my XJ40, I converted to clear power
steering fluid since cap states "Power Steering"  and I KNOW that is what
one of my teenagers will put in there!!!

The Haynes manual has some good points, but I suggest that if you are
serious about doing a re-build on this car that you get the JDHT CD for
about $23 USD. http://www.jag-lovers.org/jagcds.php3?ql   It is basically
the original service manuals scanned and placed on a CD.

Also get a copy of the original Owner's manual which explains all the things
on the dash that the manuals do not.

Webserve