I have inboard rear brakes and rebuilt the carrier myself. Except for the spacers for the correct hub play, have had no problem racing. If you have
oil leaken out a seal on the brakes, there is a problem either in the vent tube and too much pressure is building up and pushing fluid out or the stub shaft axle is wobbling. Depending on what carrier is in the case,you really don't need to change the
oil more than once at 50k miles.
synthetic oils work very well in the rear end. As for bleeding the brakes, I can manually do it in 10 minutes my self with the ERA panel removed. I am sure it will can a little longer with the interior rugs in the car. There are kits for ducting outside air to the brakes both front and rear. As for the wheel hop, This depends on how high the rpm is before the clutch is dumped,type of tire amd how many heat cycles in them. I race at Run and Gun, leave the line at 1600 rpm with a set of 335x17" pilots on the rear, it squats 2" and leaves, no tire spinning or hopping. Suspension is the big thing and if not set up correctly, the car is going to handle poorly. Wieght balance the car with you in it, get the alignment setup to the Spec in the ERA manual, It is tough finding a shop to setup the Jag rear to spec with the shims going in the drive shaft points and the toe being shimed on the lower connection points. This process takes 2-4 hours with all the adjustments. Front and rear. You then need to safety wire some of the bolts back up. Rick Lake