Cant get fluid into brake lines after changing escalade brake lines

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 module reads 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.
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Service Stability System AND abs Pump issue

ABS Control Module Replacement Service Cost YourMechanic

https://www.rockauto.com/en/catalog/cadillac,2002,escalade,5.3l+v8,1431695,brake/wheel+hub,abs+control+module,1844

some have bleeder screws on the abs control module if this does not help to remove the air i have used syringes filling them up and pressure filling the caliper and air returns to master cylinder takes about 3 ounces of brake fluid per side.

You will have to take it to a Dealer or someone that has as 'special' reader to over-ride the ABS system.

start at the longest line have a friend pump the pedal and then hold it down while you open a bleed nipple on the longest line. close the nipple and repeat the process until there is no air from the nipple. close off and go to the next longest line and repeat the process eventually ending at the shortest line. Keep an eye on the reservoir level as it will run dry quickly as the air is removed.

you may want to check these solutions, sounds like it could be the brake booster. check the vacuum line the goes to the booster. disconnect it and start the truck, air should be sucking into the line. also there should be a one way valve on that line. make sure not to forget to check your brake fluid..it could be low or none at all.

are you talking about brake fluid --power steering lines do not connect to the brake system --- also their is no weep hole at the bottom of the brake booster ---can you please clarify what is leaking and where --power steering lines from pump to radiator to steering rack ----brake booster mounted to fire wall with brake master cylinder bolted to front

have it checked (or check) for a brake fluid leak (check the master cylinder) for low brake fluid-look under the car, on the inside of the wheels especially, for a lot of fluid-you may have a leaking brake line-no matter what, you really need to have it towed, it is a big vehicle and less than functioning brakes is very dangerous.

Check the ABS hub reluctor ring to make sure it was not damaged in any way when you put everything back together. Also check all the wires to make sure none are crimped or disconnected. Lastly check the brake master cylunder for fluid level. Sometimes after retracting the pistons forcing more fluid into the master cylinder will cause this meesage. If the fluid level is to high simply remove some.

check belt and check p/s fluid if ok pump is probably bad with truck running you should be abel to see the fluid flowing threw th reservior when running