Valve depressor tool 6670

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Air trapped in the lines, calipers or wheel cylinders will make the pedal feel soft and spongy. Air is compressible, so when the brakes are applied any air bubbles in the system must first be compressed before the hydraulic fluid will transmit pressure to apply the brakes. Click Here to Read More Advertisement As a rule, the brake circuits on most vehicles with anti-lock brakes can be bled in the usual manner — provided no air has gotten into the ABS modulator assembly. If the only components you replaced were downstream of the modulator calipers, wheel cylinders, brake hoses or lines , chances are normal bleeding procedures will clear the lines of any unwanted air.

Brakes can be bled manually, with a power bleeder, injector tool or vacuum bleeder. The most common bleeding procedure is to bleed the 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 truck, 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. Or, what if you had to replace the modulator or high pressure accumulator? Now you have a more difficult job ahead of you. Air can be very difficult to remove from an ABS modulator assembly because of all the nooks and crannies inside the unit. 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.

It has four wheel-speed sensors, but is a three-channel system. The front brakes are controlled separately, but the rear brakes share a common ABS circuit. Attached to the master cylinder is the hydraulic modulator and motor pack assembly.

An important service point to note here is that the two lower transfer tubes and O-rings must be replaced if the master cylinder and modulator are disconnected from one another. This is necessary to prevent leaks that could cause the brakes to fail. The modulator motor pack, isolation solenoid valves, gear cover and individual gears are all serviceable parts and can be replaced separately. The usual bleeding sequence is right rear, left rear, right front, left front.

Advertisement Before you begin, however, you must make sure the rear pistons in the Delco ABS-VI modulator are in the home position so the check balls are unseated. You can now command the rear motor to drive the pistons to the home position. Without a scan tool, open the front bleeder screw at the modulator.

There are two, so be sure you open the front one. Then bleed the modulator. Close the screw, then bleed both front brakes starting with the right one first. After checking for a firm pedal, drive the vehicle above three miles per hour. The controller will automatically reset the system by commanding the rear motor to run to the home position. Once this has occurred, you can stop the vehicle and bleed the rear brakes. It uses solenoids like most other ABS systems.

The Brake Pressure Modulator Valve has one inlet apply valve and one outlet release valve for each brake channel, plus two accumulators one for each brake circuit. The inlet valves are normally open, and the outlet valves are normally closed. The solenoid for each valve is energized when the EBCM provides a ground to complete the circuit. The lines are color coded for identification:.

But if air has entered the modulator, the system will have to be bled using a pressure bleeder and scan tool:. Advertisement After this, the scan tool will instruct you to bleed each wheel. During this step, the pump runs and the respective release valve cycles for one minute.

This is repeated for each wheel. Finally, the scan tool performs a final 20 second cycling of the ABS solenoids to purge any remaining air. Relieve pressure at the bleed tool and remove it from the master cylinder. Then check pedal height and feel to make sure all the air has been removed and the pedal is firm.

The modulator assembly uses solenoids for each brake circuit, but there are no special bleeder valves or special scan tool bleed procedure.

So the brakes can be bled conventionally. The sequence if right rear, left rear, right front and left front. Advertisement Integral ABS systems use a high pressure pump and accumulator for power assisted braking as well as anti-lock braking. As a rule, the accumulator must be depressurized before doing any type of brake repair work.

Some of these systems can produce pressures of up to 2, psi, so never open a brake line or attempt to replace any of the ABS hydraulic components until the accumulator has been fully depressurized. This is done by pumping the brake pedal firmly 40 times with the ignition off.

After repairs have been made, the lines can be bled manually, with a conventional power bleeder, injector tool or vacuum bleeder. With all of these methods, leave the key off so the ABS pump does not pressurize the accumulator.

Each of the brakes can then be bled in the usual manner following the sequence recommended by the vehicle manufacturer. On the GM cars, the usual sequence is right rear, left rear, right front and left front. Advertisement If the master cylinder or ABS modulator has been replaced, or there is air in either unit, the ABS modulator will have to be bled using a specific procedure.

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. Advertisement Depressurize the accumulator by pumping the pedal 40 times with the key off.