Ok, so I got my 3400 swap done and I didnt have the ABS hooked up for the longest time. A few weekends ago, I got back to working on some more wiring and got the system hooked back up. At first they weren't working and I still had a light on the dash for ABS. Today, i'm needing a new starter and while driving here to my parents house (i have an extra starter, w00t!) i noticed that the ABS light hadn't come on. So out of curiosity I drove down an alleyway on the way that's all stone. Nice firm press to the brake pedal and discovered that my ABS started pumping. This is definately a plus.
Now here's the problem. Any time the ABS system activates my brake pedal will drop to the floor. I can clearly remember before that it would not do that and my 97 GTP does not do this when the ABS is running. It always stays nice and firm. Though the cavalier's pedal is going to the floor, the brakes were still pumping and keeping the car from skidding. I'm gonna try it later out when i'm by myself on some country roads and see if it will retain enough pressure on it's own to acceptably stop the car with the system running.
What would cause the pedal to sink to the floor only when the ABS kicks on? I'm guessing this means that the module up on the master cylinder needs bled? And i'm kinda curious if there's a procedure to do this without a tech tool. Since I'm running the standalone and the stock PCM is deleted from everything except the speedometer, nobody will be able to hook anything to the OBD port. Or should I look for some other mystery problem.
i bled my brakes in my 94 without using a scanner, your supposed to bleed the abs pump/motor first then go around and bleed all 4 wheels, sounds like that motor pack might be on its way out and it could be leaking internally as well, but try bleeding the abs pump first
Right...... but how do you bleed it?
there should be 4 bleeder screws on the master cylinder.
if I understand the service manual correctly, those are for the ABS.
Quote:
1. Connect the bleeder hose to the rearward bleeder valve on the hydraulic modulator.
2. Slowly open the bleeder valve. Allow the fluid to flow until no air is seen in the fluid.
3. Close the valve when the fluid flows without any air bubbles.
4. Repeat the previous two steps until no air bubbles exist.
5. Relocate the bleeder hose on the forward bleeder valve on the hydraulic modulator, repeat steps 2-4
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when i bled mine i opend the one closest to the master and got someone to push the pedal and hold and i cracked the screw until there was no air, then i moved farther outward then i did all 4 wheels
