ABS bleed out on the 96 - Suspension and Brake Forum

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ABS bleed out on the 96
Saturday, April 21, 2012 7:34 AM
alright well the rear brake line across the rear suspension arm rusted and blew the other day on the 96 cavalier we have currently

now the whole system went dry

we do have a 3,000 dollar SNAP ON computer that has all the ABS capabilities

what exactly do i need to do to make the bleed easier and what steps exactly

without a vacuum or power bleeder


just put the two pistons in home position and will be good to go then?

or?

will i need to bleed out the M/C first seperately?

or the ABS unit?

if so then how and what steps for that exactly?

i need to patch this tubing and bleed out this today if at all possible

thanks for anything

-96 cavalier 2.2 auto 143k miles

Re: ABS bleed out on the 96
Saturday, April 21, 2012 8:07 AM
heres what ive got so far

if not correct then lemme know thanks!

A slipping motor pack, though, can cause a soft pedal in Delco VI systems. If the motor pack doesn’t hold when brake pressure is applied, the modulator piston can be pushed down inside its chamber. One way to check for this condition is to remove the bottom cover on the motor pack. Have a helper push on the brake pedal. If you feel the gears move, the unit needs to be replaced. Also if fluid is leaking from the unit, it needs replaced.


The two ways to home the pistons are with a scan tool (which is the preferred technique) or with a special manual procedure. If using a scan tool, select the "ABS Test" mode, then the "manual control" or "motor rehome" option. The motors in the modulator can now be commanded to drive the pistons to their home positions. The motors will not return to their home positions, however, if the ABS warning light is on or if there are any fault codes present in the system. All faults must first be repaired and all codes cleared before the pistons can be homed.


Once the pistons have been homed, bleed the modulator starting with the rear bleeder screw first. Attach a length of clear tubing to the rear bleeder screw, and submerge the other end in a clear container partially filled with brake fluid. Open the bleeder screw one more turn and apply pedal pressure. Close the bleeder screw when the pedal bottoms out. Repeat until no bubbles are in the fluid. Then repeat this procedure for the front bleeder screw on the modulator. Once the modulator has been bled, the brake lines can be bled manually or with pressure equipment in the following sequence: right rear, left rear, right front, left front.


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The brakes on GM cars equipped with Delco ABS-VI may be bled using manual, vacuum or pressure bleeding. The usual bleeding sequence is right rear, left rear, right front, left front.

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. If this is not done, you won't be able to bleed the rear brake lines. There are two ways that this can be accomplished: With the Tech 1 or similar scan tool, select the F4 ABS Test mode, then select the F0 manual control option. You can now command the rear motor to drive the pistons to the home position.




-96 cavalier 2.2 auto 143k miles
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