TC - I think the metal baffle plate in the master cylinder of the V-Max is
simply to prevent fluid from shooting out of the master cylinder if you
actuate the brake lever with the cover off. The cup opens the fluid port
on the bottom of the master cylinder. When the brakes are applied, the cup
moves forward and a small amount of fluid squirts upwards until the cup
completely passes the hole and begins to compress the fluid in the master
cylinder.
I doesn't have any check valve action.
Scott
VMOA #500
TC wrote:
> Scott,
> I could certainly be wrong .. it won't be the first time. However, the
> only reason I got into this was when doing a disc brake conversion on
> a '56 Chevy wagon that I own. I had the choice of putting a 2psi
> inline valve between the master cylinder and the calipers or changing
> to a late model unit in which it is integral, (I pulled a cool looking
> aluminum master cylinder out of an '87 Buick .. a Skylark I think ..).
> I suppose it is wrong to refer to this as a check valve as it only
> maintains a residual pressure in the brake lines with the piston
> retracted. It will not prevent movement of fluid in either direction
> that exceeds it's rating. This master cylinder also has a warning
> switch that operates when there is no residual pressure remaining in
> the brake line when the piston is retracted, (to indicate that
> pressure is no longer being retained and that you may be missing a
> wheel or something I guess). I assumed that was the purpose of the
> little metal spring tab, (oil baffle plate), in the base of the master
> cylinder .... but if it does not wedge against the fluid entry hole in
> the bottom of the fluid well ... then it could not possibly be
> serving this purpose ... I guess I can reach in mine and pull it out
> and see what happens ... if it is not blocking the hole then I don't
> need it I guess .. and I couldn't possibly have any residual pressure
> in the front brake lines.
> campbell
>
> ----- Original Message -----
> From: "vmax97" <[EMAIL PROTECTED]>
> Subject: Re: check valve
>
> > TC - I have to agree with Eric on this. Most systems do not have a
> check
> > valve. The rare exception would be in a system where the master
> cylinder
> > is mounted below the level of the brake caliper. All motorcycles,
> that I
> > have ever seen, have the master cylinder higher that the caliper.
> The same
> > goes for normal motor vehicles.
> > Scott
> > VMOA #500
>
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