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Re: when apply brake car not stoping (cadillac 2001 STS...
You need to bleed all four corners and when doing so use a hose from the bleeder valve into a clear jar half full of brake fluid. Keep The Hose Under The Level Or Air Will Get Back Into The System. When Bleeding Close The Valve And Have Someone Push The Brake Pedal 1,2,3 Hold Then While The Person Is Still Holding The Brake Slightly Open The Valve Then Keep Doing It Until You Don't Even Get A Bubble. Do This On All 4 Wheels And You'll Be Good To Go. The More Air That Comes Out The Harder The Pedal Will Get. Make Sure To Keep Filling The Reservoir Cause If It Empty's You'll Have To Start All Over.
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This will be a problem with either a collapsed brake line or the proportional valve. A collapsed line will not allow the proper flow and pressure to the brake assembly, and a faulty proportional valve will allow the pressure to bleed back into the system. You can test for these with a pressure tester. If the pressure is low but constant while the brake pedal is held down, it's a collapsed line. If the pressure drops off slowly while the brake pedal is held down, then it's the proportional valve.
Sounds like you need some brake service. I would take your pads off and check them replace if necessary, check rotors and replace if needed, check calipers and replace if needed. If this is a drum set check shoes, and drum, and wheel cylinders. Bleed system.
Probably there is a leak in the hydraulic brake line hoses
connecting the master and the wheel cylinder hose. Also get the brakes bleeded
to remove any air the system. also get the check valve of the brake booster
checked and the vacuum hose.
Probably air in the brake system. Bleed your brakes thoroughly. Start with right rear, then left rear, then right front then left front. Maintain proper fluid level in master cylinder while bleeding. Brake pedal hieght comes from the rear brakes, as those are the longest brake lines in the system. Mike
This condition indicates warped rotors. You will need to remove the rotors and have them turned on a brake laythe. Since you will have the calipers off, go ahead and replace the pads...its an inexpensive maintennance item. Good Luck, Hope this is helpful.
The hard part is pressing the caliper piston abck into the caliper so you can get the new, thicker pads over the rotor. A large C Clamp works best.
SECTION 206-03: Front Disc Brake
2001 Villager Workshop Manual
REMOVAL AND INSTALLATION
Pads —Front Disc Brake
Remove the wheel and tire assembly. For additional information, refer to Section 204-04 .
Remove the front disc brake caliper bolts. torx bit. T20?
Support the front disc brake caliper from the front strut and spring assembly using mechanics wire.
Remove the front disc brake pads.
Remove the outboard front disc brake pad.
Remove the inboard front disc brake pad.
CAUTION: Make sure the master cylinder reservoir does not overfill and spill brake fluid while retracting the front disc brake caliper piston. NOTE: It is necessary to fully retract the front disc brake caliper piston in the bore before installing the front disc brake pads. Install the front disc brake pads.
Install the inboard front disc brake pad.
Install the outboard front disc brake pad.
Caution. The outer pads are left and right. put left on driver side.
Position the front disc brake caliper on the front-wheel knuckle and install the brake caliper pin bolts.
WARNING: It is necessary to depress the brake pedal several times to position the front disc brake caliper piston before driving the vehicle.