Geoff,
   If your pads are getting low, then on the '88 you should have a warning
coming up saying your brake pads are low. It will be steady if the pads are
low, not intermittent. This means one of 2 things: either your  pads ARE low
(steady)or the sensor wire to the pad has been damaged (intermittent).
   In any case, you still have a bit of driving left on the pads, but you
should start to make preparations for changing them out.
You have to determine if the pads have the round connectors or the square
connectors.   Jag made two different types in '88. You can also order by the
VIN when you order from the parts store and they should supply you with the
correct ones.  Most of us have just cut the connectors off and solder the
wires to the ones coming from the car when we change pads. That way we don't
worry which connector or whether the guys at the parts store actually put
the right pads in the box!!
   You probably can use the same rotors. If you decide you need to do rotor
work, then you must replace the rotors.  There is not enough metal on the
rotor to have them turned.  Rotors are only about $40 each and turning them
is $20 each so it really isn't worth it anyway.
   When it comes time to change the pads, DO NOT force the piston back into
the caliper without opening the system. If you do, you will be forcing nasty
brake fluid back into the ABS valves and creating a possible problem.  It is
always wise to bleed all four lines and flush the system anyway.  Go out and
by a litre of fresh DOT 4  -- NOT DOT 3 brake fluid and flush the system. On
the '88, you should do this with the engine running since the pump is belt
driven  -- unlike the later 90+ models.

All in all, the brakes on this car are really no more difficult than any
other car. Remember that you have 4 sensors, one on each set of pads on each
wheel and if you still have a warning after the pad is changed, it means the
wires are broken.

Cheers
Webserve

It is an XJ40, not 140. No big deal unless you want to buy a Service Manual.

Really good Idea if you plan on doing any work yourself n the car. Haynes sells
one at a reasonable price.
Richard H. Kuschel
"I canna change the law of physics."-----Scotty