Hi all,
Vehicle is 1995 GMC Sierra 1500 4X$ 155,000mi.
I bought it used and the brakes were marginal. The ABS module, master
cylinder, and pads were replaced. Later, I replaced the rear wheel
cylinders, shoes, hardware, and had the drums turned. The brake pedal is
still inconsistent and a bit soft. I think there's air in the abs module
because when the abs activates the pedal will just about go to the floor.
Afterwards, the pedal firms up and feels pretty good, but after awhile it
gets inconsistent again.
The local chevy dealer wants $150 to bleed the brakes on their scan(m)
system. Is there any way to cycle the ABS remotely so I can bleed the
brakes? I've heard that some will drive the vehicle and forcefully brake to
get the abs system to cycle and then quickly try to bleed them, but there's
gotta be a better way.....
Any ideas out there? TIA.
TomC

TomC wrote:

The only way to properly do this is with a scan tool
and pressure bleeder. I've done it without a pressure
bleeder, but the scan tool is essential as that's the only
way to perform the "automated bleed procedure".

Ian

shiden_kai <V-L-M (AT) hotma1l (DOT) com> wrote in article
<_%MAh.985837$5R2.592042@pd7urf3no>...
Or, is it a dealer only thing?
TIA!
TomC

TomC wrote:

You will be much further ahead to simply pay the
dealership to do the job.

Ian

shiden_kai <V-L-M (AT) hotma1l (DOT) com> wrote in article
<lQPAh.986264$5R2.758789@pd7urf3no>...
Yea, you're probably right; but, it's sorta like going to the doctor's....
what else are they gonna find wrong?
TomC

TomC wrote:

I looked into this on my 2000 s10. There was an old thread where someone
posted the directions on how to do it. They claimed they bought a spare
ABS system and disassembled it then took the PCB where the contacts are for
all the valves and soldered on small push buttons to actuate the valves,
then pulled the pcb off their truck, stuck on their modified PCB, turned on
the power and pressed buttons at random to open and close all the valves.
Seems like it could work in theory but I didn't want to test it so I made
sure to not get air in mine.

Eugene <no (AT) spam (DOT) com> wrote in article
<GZWdne2rbbB5k0jYnZ2dnUVZ_qrinZ2d (AT) wideopenwest (DOT) com>...
way. I don't know much about the system but it is electrically operated so
it doesn't seem like it would take much to supply the right juice to the
pumps/solenoids to make them cycle. Sounds like a project for somebody;
hint...hint. Anybody know where I can get a schematic/diagram of it?
TomC