Subject: Re: How do you flush the ABS? by BillH on 2009/8/7 23:00:44
Quote:
Fluff wrote: Thanks Bill, but it was my fault for not reading properly.
I have the 93 FSM and will check out specs. I do sometimes get a very slight pulsation so Im going to put a dial gauge on the rotors and check the bearings etc., it could be that I'd get away with just indexing them, but if I can find a machine I'll probably get a quick skim anyway.
One thing that has come to mind since I finished, is I wonder if it would have helped if I'd have pushed the pistons back into the calipers (and kinda chocked em there) before bleeding. I wonder if this would have helped by pushing any air & contamination back to the m/cyl rather than flush all the remaining cr*p through the system... any thoughts?
My big concern at the moment is this start-up check and why I can't hear it. I feel that it would should up on the DIC if it wasn't happening. But I'm darned if I can hear any valves cycling.
First, pushing the pistons back wouldn't have made any difference so it's no big deal that you didn't do it.
On refinishing the rotors, I wouldn't do it provided there are no gouges. The slight pulse you feel is probably one of 2 things, a greater thickness of the adherent layer of the current pads or a hard spot on the rotor. If it's an adherent layer, cleaning them will help. If it's a hard spot, some brake rotor turning machines can skip over it or cut it less than the softer part of the rotor and you're back to where you were anyway. If the pedal wasn't vibrating at 60mph stops, your rotors are probably OK.
The spec for your rotors is 0.006in (0.15mm) runout Thickness variation is .0005in Min rotor thickness 0.744in (20.2mm) Discard at 0.724 (18.4)
You'll probably get a couple thou on the runout but again, I wouldn't worry about it until you hit 0.006
Have you checked codes on the dash with a paperclip ? If not do this (see the how to in the tech section) If no codes and the ABS light's on, look in the 5E1 section for chart C. Turn the key on, check for codes, if no codes, turn thr ign off,disconnect the EBCM harness, if the ABS light is off, it indicates a bad EBCM.
Do you know if you're getting battery voltage to the ECBM?
