From: MV (MV@dc9.tzo.com)
Date: Fri Sep 02 2005 - 09:14:26 PDT
Ron,
I would not ASSume that because you have a hydraulic boost system that
you cannot get air into the master cylinder via the booster. I'm quite
sure that their is an air break (gap) between the hydraulic side and the
brake fluid side.
Silicone has a nasty habbit of trapping air for some reason much better
than conventional brake fluid. That is probably your problem. I would
recommend that you invest in a vacuum based brake bleeder, one that uses
a simply hand pump. They are very effective at bleeding tough systems
and a lot faster than doing the two person pump the brake pedal thing.
JC Whitney has them, I believe Harbor Freight sells them, Sears used to
sell them, etc. About $40 or so and worth more than that.
Yes, putting the MC cover back on is a good idea unless you are trying
to strip the paint off your car (with conventional fluids) or if you are
trying to get that silicone high gloss finish! (;->)
Dave
Ron wrote:
> SORRY, but this has NOTHING to do with anything KATRINA, so hit delete
> now....
>
>
> My M1009's master cylinders rear compartment that services the rear
> brakes was found to be empty after the pedal went almost to the floor at
> a stop sign. I refilled it and commenced bleeding the brakes, and after
> an hour of 'Ok, open bleeder, pedal slowly down, on the floor, close
> bleeder, let it up, pedal down, open bleeder'..... repeat as needed,
> over and over.
> Master doesn't seem to be taking any of the new fluid (or very
> little).Lots of air bubbles, got about a pint of fluid out the left rear
> along with the bubbles.
> No leakage around the actuator rod inside the firewall. No apparent
> leakage out either of the rear drums, which I haven't pulled yet.
> Manual says (always read it AFTER you screw around for an hour or so,
> 'We don't need no steenking manuals!') to wait 15 seconds after the
> pedal returns to the 'up' position before pushing it down again (???),
> but that don't fit in with the way I was shown how to do it at the
> filling station back in the sixties.
> Does this sound like incompetence on my part or some thing more
> serious? Since the power booster is hydraulic instead of vacuum, I think
> I can ASSume the air is not getting in there.
> BTW I have found out that while trouble shooting the system, you do
> not want to start the truck and then rapidly pump the pedal with the MC
> cover off. Why you ask?
> A) When you let the pedal snap back up, the front reservoir shoots a
> small fountain of silicone brake fluid about 2 inches above the MC.
> B) The fan air flow takes this fountain and blows it all over the
> fender, firewall, windshield, roof and helpers faster than you can yell
> 'Oh Sheet!'.
> C) This unfortunate chain of ignorance, stupidity and bad luck
> eliminates the 'chalky' look of Aervoe paint, and gives the engine
> compartment a 'show car' look, for a while at least.... ;-(
>
> Any help or suggestions would be appreciated.....
>
>
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This archive was generated by hypermail 2.1.4 : Fri Oct 28 2005 - 23:27:02 PDT