cadillac seville STS brakes dont work

[pimpin0_2]

I have a 99 Cadillac Seville STS when I press the brake pedal it goes straight to the floor does anyone know whats wrong please help.

[submariner409]

Is there any evidence of brake fluid on the floor or sprayed around in a wheel well or under the car? Is the master cylinder reservoir empty ?

[N*Caddy]

Hey! What happened with my reply?
I just posted one about one hour ago on this thread and I see now is gone!
I was saying in there to check for a break fluid leak. The easiest approach is to just check the break fluid level. If is low (in this stage of no breaks you should have a “break fluid low level” on your DIC) just start from the master cylinder and work your way down to the calipers. Most likely areas to fail: the rubber hoses connected to the calipers, the o-rings in the calipers, or maybe loose calipers bleed nipples (that in case you recently serviced your break system).
If the break fluid level is normal, then huh… the only thing I would check is the master cylinder.
Also, you might have an issue with your ABS module manifold (valve pack). I know on mine is a return line, I am not sure how is exactly working but should be electrically controlled valves, if one is stuck…you could just send the break fluid back to the return line (don’t jump on me if you know exactly the manifold architecture, I am just throwing an idea).

[N*Caddy]

ABS correction:
Today I took my original ABS module apart (literally) finally that stubborn lug snapped. I examined very closely the pump and the manifold. There is no return line to the master cylinder, the two lines are one left side and another right side, and the flow direction in both lines is bi-directional following the break pedal:
IN (break pedal down)
OUT (break pedal released).
So there’s NO WAY the ABS module to be culpable for your problem, is either master cylinder or master cylinder (presuming the fluid level is in specs).
By the way an over $2000 part was down due to a sticky brush, one of the four brushes was stuck few microns away from the rotor (thus no contact, thus stuck pump). THE WORD IS CORROSION .