I replaced the rear brakes on my malibu maxx SS. I took the bleeder valve all the way off the pasenger side because I could not get the piston to release. I tried to bleed the brakes after installation (I loosened only the rear passenger side) The brake peddle still goes to the floor. Do I have to bleed all of the lines even though I only removed the one?
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The proportioning valve simply ensures that the front brakes are applied before the rear brakes are, to prevent sideways skids from loss of rear traction. The valve also serves as a warning light when one end, either front or rear, of the system has deficient line pressure. Inside the valve is a cylinder, and a piston that belongs in the center of the valve cylinder (when fluid pressure on each side is equal). When one side of the valve (front or rear brake system) loses pressure (like from a leaking brake line), the piston gets pushed to the low pressure end and makes contact with a switch terminal that turns the light on.The trick to turning the light off is to figure out which end, front or rear brakes, the piston is on, and then bleed the other end to center the piston and turn the light off. Too much pressure on the brake pedal will cause the piston to go past center to the opposite end, and a close watch on the brake warning light will reveal that as the lamp will flicker once while the piston passes center. Gently depress the brake pedal (requires an assistant) with a bleeder open and close the bleeder as soon as the assistant (brake pumper) sees the light go out. If he sees the light flicker once bleed the other end of the vehicle to go back towards center.
If you are replacing the rear pads and are trying to retract the caliper pistons here is what you need to do. Use a piston installation tool in order to twist the brake caliper piston into the brake caliper bore. If you do not have the tool you can retract the piston by using a needle nose plier. Exert downward force and rotate clockwise until the piston bottoms out. Before installing be sure the two "U" shaped slots are at 6:00 and 12:00 Oclock.
In order to retract the pistons on the rear calipers you need to use a special tool that will rotate the piston in a clockwise direction.It may be possible to try to use a strong needle nose plier.Apply force against the U shaped slots on the piston and rotate clockwise until the piston bottoms out.Before you reinstall the caliper make sure that the recessed slots are at 12 and 6 "o"clock..the slots align with one or two bumps on the inside pad. If you are having problems with your calipers rebuilt one are a good option.If only the caliper slide pins are sticking they can be cleaned and lubricated.Pin lubricant sometimes comes with a set of brake pads.Other than that lube may be purchased separately at an automotive supply store.