Do what is called a gravity blead. open all bleeders slightly and do not let the master cylinder go dry. after this start at passenger rear then drivers rear, passenger front then drivers. if this does not help you must bring the car in to a garage for abs bleeding and/or new abs module.
I have taken the car in brake work fine for about 6 weeks I've done the same at home bleeding lasted again about 6 weeks some problem pumping brake thinking of replacing the proportion valve myself or replacing the master cylinder myself at lest i know the work was done.
how can you tell when your master cylinder is going bad what sign to look for.
the master could and would exhibit the same scenario. roportional valves usually entail brakes grabbing at front or back but again it could be abs too but try the master cylinder first.
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SOURCE: brakes to the floor(almost) 99 blazer
bleed the brake again. if the pedal goes to the floor with little resistance, then the master cylinder is your problem.
the shim is to depress the noise when you applied the brake. you can skip that, if the brake works without it.
SOURCE: 1994 Cavalier -replaced master cylinder-no pressure to rear brake
The most common bleeding procedure is to bleed the ABS brake furthest from the master cylinder first, then bleed the other brake that shares the same hydraulic circuit (which may be the other rear brake on a rear-wheel drive car, or the opposite front brake on a front-wheel drive car or minivan). After these have been bled, you then bleed the other brake circuit starting with the furthest brake from the master cylinder.
Air can be very difficult to remove from an ABS modulator assembly because of all the nooks and crannies inside the unit. The modulator may have eight to 10, or more, ABS/traction control solenoid
valves, plus various check valves and dead-end ports. Some ABS modulators have special bleed screws to help you vent the trapped air when bleeding the system. Others do not and require the use of a scan tool to cycle the ABS solenoids while you bleed the system. 1. To bleed the isolation valves in the modulator, there are two bleeder screws. Start with the one toward the engine. Turn the ignition on and apply light pressure on the brake pedal. Open the bleeder screw and allow the fluid to flow until clear. Close the screw and do the same at the second bleeder screw. 2. Depressurize the accumulator by pumping the pedal 40 times with the key off. Wait about two minutes for the brake fluid to de-aerate, then refill the fluid reservoir with DOT 3 brake fluid. 3. Now you can bleed the boost section. This is done by applying moderate pressure on the brake pedal and turning the ignition on for three seconds, then off. Repeat this a total of 10 times. Make sure the pedal feels firm when you have finished, and give the car a road test to make sure the brakes are working properly.
SOURCE: how do you bleed the abs unit on a 1997 chevrolet truck
start by bleeding the master cylinder bleed the line closest to the fire wall, then proceed to the right rear wheel, left rear wheel, right front wheel, and then the left front wheel.
I just went to Brake Masters this morning and had them replace the Master Cylinder since I was experiencing the pedal very spongy and going to the floor. When they replaced the Master Cylinder and they gave me back the car, the brakes were still spongy and going to the floor. I addressed this to them and they took another look at it, but when I took it for a second time, the brakes were extremely spongy. It was almost like they gave me back my car in worst condition to when I brought it in. Can you help?
SOURCE: Hi i have a 1995 cheverolet silverado 1500. For
If you haven't already, check your rubber lines for weakness; they could be ballooning under pressure.
Fig. 1: Loosen the front brake line in order to bleed the master cylinder
Fig. 2: Connect a bleed hose from the bleed valve on the front caliper to a jar of brake fluid
Fig. 3: Always follow the lettered sequence when bleeding the hydraulic brake system
Hope this helps to solve it; remember to rate this answer.
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