ABS Module?
 

Sporadically, while driving, the ABS, BRAKE, and DSC lights will come on and stay on, and it feels like something is holding the car back and it cant accelerate properly. I took the x5 into the dealer today, and after $75, they told me that the vehicle needed a new ABS module and that it would cost about $1500. i was shocked because this just started happening and the vehicle drives fine except when these lights come on...they usually come on after ive been driving for about 5 minutes...any advice on whether this is the correct problem and if so, where can i buy one of these modules cheapest and get it done myself? Thanks so much for all your help!!!

I take it that you are out of warranty?
Price sounds steep, check with some wrecking yards. Also try Crevier BMW in LA, they have good prices on parts.

I had the same issues with mine at 40,000 miles but was still under warranty. they replaced everything under warranty. I had a loaner over Xmas while the air freighted the parts from Germany. The dealer said it would cost around $2000 on my own.

Before spending such an amount on a new ABS unit I would like to be very sure it is actually that unit and not for example a faulty ABS sensor / DSC pulse generator.
Don't you know anybody with an OBD scanner to see what codes it comes up with?

www.car-part.com

There are many used ones for $150.

I had that happen on my Audi. Had the module rebuilt by ModuleMasters.com for $200. Excellent service. But I agree with LeBaron above: check the sensors first.