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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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The brake lining's have worn away, the squealing was metal to metal (worn pad against metal disc) The worn pad will have damaged the brake disc. Very dangerous. You will now have to have new brake pads and discs fitted to BOTH front wheels to put it right. Good luck
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.
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.
You will need to bleed the brake system. I would start with the rear brakes lines and work towards the front.You must have key off engine off when bleeding brakes, apply pressure on brake pedal 10 times and hold. The brake line is now ready to be open. Open and let the stream of fluid come out and close the line tight. Then release brake pedal once bleeder screw is close. This procedure must be repeated twice front and back. After, brakes have been bleed pump the brake pedal before putting in drive. Note: Don't let the resevoir run low on brake fluid. This will cause air bubbles to accumulate on the brake system. Always top off before opening bleeder screw.
check that fluid level is ok, by changing pad and opening calipers you may have lost fluid our of resovoir.
if your discs where not changed or skimmed at the same time you will have ridges, that do not match to the smooth pads, when you drive for a few miles eventually the pads will wear down and form the shape of the discs.
if they continue to be soft, bleed the fluid to make sure there is no air in it, if the brakes are still soft after this you should replace the brake fluid completely if it has not been done for a while as brake fluids absorbes moisture and that makes the brakes feel spongy or soft.
Before servicing the vehicle, refer to the precautions in the beginning of this section.
Remove or disconnect the following:
Clip, 2 caliper pins, the anti-rattle spring then remove the 2 brake pads and the 4 anti-squeal shims
CAUTION Only replace brake pads on 1 side of the vehicle at a time. Failure to use this procedure could cause the caliper pistons on the opposite side of the vehicle to pop out requiring the reconditioning or replacement of the brake caliper.
Remove a small amount of brake fluid from the master cylinder.
Install a used brake pad into the caliper and compress the caliper pistons.
Apply disc brake grease to both sides of the inner anti-squeal shims.
Install or connect the following:
Anti-squeal shims to the new brake pads NOTE: When replacing worn pads, the anti-squeal shims must be replaced together with the pads.
2 brake pads
Anti-rattle spring and the 2 caliper pins
Depress the brake pedal several times to seat the brake pads.
Check the brake fluid level and top off as needed.
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 rear pads are usualy harder than the front and the harder the pads the more wear there is on the rotors Unless the rotors were worn to the point of replacement they could have had them skimmed.Being soft doesnt make much sense.Have an 03 ba falcon and only replaced our rotors after doing 125000ks The expidition is a similar beast that used the same brake system.Get the rotors skimmed and go to a slightly softer pad to extend rotor life