cdl2 your e brake is on the rear of the transmission if you lay down under the MH on the drivers side you will see it on the drivers side you'll also see the cable running to the brake shoes in the brake drum on the back of the trans. Just above this cable you will see a pipe plug ( some times you have to climb up to see it but it's there ) remove plug and check level.
If it hasn't been checked before and it's not leaking fluid may run out, when they filled them at the plant they weren't level and they were over filled. Use dextron ll or mercon V.