I have a 94 Grand Am V6 with ABS brakes and drums on the rear. When the car
is running, the brake pedal travels almost all the way down to the floor. It
can stop the car just a little bit better than a car with a full 2 circuit
master cylinder, whose brake line/hose is ruptured. When the car is NOT
running, the brake pedal feels normal (firm with little travel). The pedal
is very spongy at all times when the engine is running. No amount of pumping
will firm it up.
The rear brakes are freshly lined, cleaned, and adjusted.
Both pistons in the wheel cylinders move freely, as do the adjusting star
There are no leaks in the hydraulic system.
The caliper pistons move freely.
The disks and pads have yet to be changed but are functioning properly.
The entire system was bled like a conventional non-ABS system with the
following exception: since there are no fittings at the actual master
cylinder, I used the two bleeder screws on the ABS module. I not only bled
for air, but I pumped enough fluid through the system to change most of the
When the car is first started, both the "brake" and "ABS" lights turn on for
a couple of seconds to indicate that the bulbs are not burnt out. After
that, they remain OFF.