I want to replace my rear brake pads But when I try and compress the piston it will not move
But if I open the bleeder then I can compress the piston
Is this normal ?

 

Yes that is normal!

BUT DON'T and I mean DON'T even think about trying to lever the Brake Pads back without undoing the 'Bleed Nipple' as if you Car has 'ABS' you can do serious damage to the ABS Actuator.

Which could be an Expensive and Time Consuming repair.

 

Thanks for the warning
I replace both disk and calipers I just tryed to push the piston to get the old pads over the ridge on the disk .
I bled the calipers all is well now.

Now for the Transmission lines.

 

You will never know just how lucky you were!

Pushing Back the Brake Pads without undoing the 'Bleed Nipples' can be the 'Kiss of Death!' to the ABS.

Its over £1,000 for a new one! if you can find one! so you would have to try and repair it, which ain't easy.

'The Jaguar Gods' must have been on your side that day.

 

The correct and standard procedure for brake pads is to open the bleeder every single time and simply top off the master now that it has new pads and all the room is taken up.
Even without ABS you should crack the bleeder, makes life easier either way, they push right in.

 

I removed and rebuilt my front calipers
I need advice on bleeding the brakes I can only get fluid to come out of
the left front 1994 XJS 4.0

 

ohsix,

You really have to bleed these Teves ABS systems properly. Unusually the Jaguar defined procedure has a major difference to the way that Teves defined how to bleed the system.

Teves states to have the ignition ON when bleeding the fronts whereas at least one version of the manual states to switch the ignition OFF when bleeding the fronts. The system must be pressurised correctly for bleeding to be successful so you need to bleed it the Teves way, not the Jaguar way. Also forget using a pressure bleeder. Slow strokes by foot is better for judging the feel in the front brakes. This is the Teves -defined method:

BLEEDING TEVES BRAKES

TWO PEOPLE REQUIRED

START AT REAR LEFT, THEN REAR RIGHT (UNLESS JUST ONE REAR BRAKE NIPPLE) THEN FRONT LEFT, FRONT RIGHT.

ONE PERSON IN THE CAR, ENSURE BRAKE FLUID LEVEL IS FULLY TOPPED UP.

TURN ON IGNITION AND WAIT UNTIL BOTH ABS AND LOW PRESSURE LIGHTS HAVE EXTINGUISHED AND ALSO THE MOTOR PUMP HAS CUT OUT.

THEN, OPEN REAR LEFT BLEED NIPPLE AND HOLD BRAKE PEDAL DOWN, WITH IGNITION ON FOR 15 SECONDS – NO MORE

TIGHTEN BLEED NIPPLE, TURN OFF IGNITION, RELEASE BRAKE PEDAL.

WAIT ONE MINUTE AND REPEAT FROM RESTORING SYSTEM PRESSURE AS ABOVE FOR OTHER NIPPLE IF FITTED – THEN WAIT ONE MINUTE AT LEAST BEFORE MOVING TO FRONT BRAKES – THIS PREVENTS THE MOTOR PUMP FROM OVERHEATING.

AT THE FRONT, ENSURE SYSTEM PRESSURE IS CREATED AND THEN BLEED CALIPERS CONVENTIONALLY WITH IGNITION ON, USING SLOW STROKES AND GO THE FULL TRAVEL BUT DO NOT FORCE.

ONCE THE LEFT SIDE HAS BEEN DONE, AGAIN WAIT ONE MINUTE AND THEN RESTORE SYSTEM PRESSURE.

ENSURE BRAKE FLUID LEVEL IS CHECKED AND TOPPED UP AFTER EACH CALIPER IS BLED.


Hope that helps.

Good luck

Paul