Poor Braking power- new cylinder-new lines new ABS module -bled

Here's a link on your brakes. ABS Light Due to ABS Control Module Failure Cadillac Seville STS Common...

It could be that your brake fluid reservoir is empty. You might also have a crack in the line.

I would change the rubber flex hose that goes from the body to the suspension.

Best case scenario bad vacuum pressure to the brake booster. Worst case bad abs control module or valve body/motor the abs system works by add and removing hydraulic pressure through valves and electric motor. Try using block off plugs at the master cylinder( remove lines plug outlets at master cylinder) check if brake pedal position and pressure is good(if there is no change problem is master cylinder or brake booster/ vacuum) if plugging at master cylinder solved issue repeat procedure at abs valve body after reinstalling lines from master cylinder if your problem returns your issue is in the abs valve body if plugging at the abs solves problem reconnect at the valve body bleed each line one by one testing between each line until you find the problem

The ABS brain block is defective! Will have to be replaced. Big aluminum block with a lot of lines to it. =Usually down low under the master cyl.

U need a special tool that holds the poppet valves open in the ABS hydraulic control unit to bleed the brakes of air, without it u CAN'T get the air out of the system.

If you are dealing with ABS brakes you probably have a bad wheel cylinder on that wheel and air in the line. Replace the wheel cylinder and bleed the system.

does the car pull one side when you brake,if it does one of the caliper is seized if not you have to bleed again or the rubber in master cylinder gonne

Gravity bleed your brakes starting at the wheel farthest from the master cylinder. No pweddle pumping. I Fill M/C and leave cover off. Then open the bleeder and watch what is coming out. Uou can see bubbles. When the fluid drips steady and without bubbles, cole and do the same to the other three. Don't let the master cykinder get low because thr fluid level helps move the fluid and air through the lines.Periodically tap the break lone with your wrench to keep everything moving.. When sll bleeders drip clean and steady. Make sore your rear brakes are adjusted to barely touch the drum. Then top off the master cylinder, cap it and give yourself a "break". :)

honestly sound more like the abs unit, it is the alloy box that the brake lines go into from your master cylinder, this will cause directional braking and awkward braking and DANGEROUS braking, it is more than likely the abs junction box and no the computer will not need program, just disconnect battery for 15 mins while doing the work. hope this has been helpfull