Seek the Jag-Lovers.com website for Dan Jensen's article on repairing the ABS Electronic control board (seems a solder joint becomes intermittent). This is a common trouble in XK8s... mine needed to be replaced recently too....
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Jesse, The module will not stop fluid to rear brakes, a bad master cylinder will,leaking lines, air in brake system, faulty metering block if equipped, collapsed flex lines or pinched brake line faulty caliper or brake cylinders,etc. will cause the possible feeling of no rear brakes.
(ABS Module components) the ABS speed sensors and the ABS control module . When the brake is applied, the ABS control modulereads the speed data from the speed sensor and sends the correct pressure to each wheel to prevent any wheel lock up, eg. sliding/skidding Links below have more info. "I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
When the ABS (Anti Lock Brake System) light is on it means the systems control module has detected a failure and the ABS is disabled, this means you just have regular non ABS brakes. To find out what the fault is requires the ABS control module be scanned with a special tool to see what fault codes show up.
The P1700 is just a request for the check engine light, and this is caused by the U2108. The U2108 is basically telling you that the Electronic Brake and Traction Control Module (EBTCM) is not communicating with the powertrain control module, or the transmission control module. The very first thing we must do is verify that the fuses that power the ebtcm are not blown and that they are powered. At this point I would like you to verify that the fuse labeled ABS in the fuse block is not blown and that it is powered with the key in the on position. I would also like you to verify that the fuse labeled V1 inthe power distribution box is not burnt and that this is powered also. After this we need to move to the ebtcm to verify that you have voltage at pins 15,17,18 and that you have a ground at 19 and 16. This would verify that the ebtcm is getting the proper voltage supplies to operate. The end result of this may possibly be a faulty ebtcm, but at this point we really need to check these items prior.Feel free to contact me with any questions at this point! Thanks!
The most likely root cause of the problem has been determined, and its step by step fix is also detailed if you have the skills to do that yourself. See the excellent detailed website posting by Dan Jensen on the Jag-lovers.org site forums.jag-lovers.org under avsn.php?1169101j41 . He describes what goes wrong in the $2800 ABS control electronic board, and that simply re-soldering a few heavy wires to the board will fix the trouble. But it requires some mechanical work to get that module out, and then some more work to saw the plastic case apart to get to that circuit board. - Best regards - MHH
On some cars, this combination indicates a failure of the ABS control module. I don't know for certain if Pontiac set their cars up the same way, or if you have two problems with the car - possibly a blown brake light bulb or low brake fluid (for the BRAKE light) and a wheel speed sensor problem (for the ABS light). You can check the bulbs and fluid level to see if they are off, but if not, it may well be the ABS controller. If that's the case, you could either buy a new one for probably a lot of money, or check out www.modulemaster.com for having yours rebuilt (usually $150-200, significantly less than buying a new one).
Is the ABS light on as well? If you have ABS and the light is on (like in Guest's comment) is it probably the ABS Control Module. You should have someone read the code to see if you get ABS as one of the issues. Rather than spending a fortune with the dealer or having a non dealer replacement, check out ModuleMasters.com. You take the the unit off (easy and OK to drive without it, you'll just have no ABS - which you probably don't have now!), mail it out to them, they rebuild it for $200, send it back and you install it, problem solved. They have step by step photo instructions on their site. A mechanic I use for diagnosis and difficult repairs initially wanted to replace the instrument cluster and then talked about replacing it with a new unit. I went online, read about the issue and fixed it myself. I let him know about it and now he has done it three times the same way with great results.