Re: TOY: Re: hydrauic "line locks"

[Thom Singer <ntsqd@xxxxxxxxxxxx>]

I suppose the line lock could be put in the system btwn the
LSPV and the rubber hose to the rear axle. Only issue there
is that it is now exposed back under the bed instead of up
under the hood.
I would look into the Mico Lock since they do not require
12V to maintain brake pressure, only to activate them. Once
activated, line pressure holds the valve closed. Tapping the
pedal releases the hold. True, they are more expensive.
Perhaps a mixture of one each would be the ideal since each
has some pluses and minuses.
It's funny, the drag race part is generically called a 'line
lock' implying that they are used at the starting line, yet
I know of no one who uses theirs at the starting line. They
all use a trans brake or a clutch drop for the launch. The
line lock is just used to lock the fronts up during the burn
out.

Scott Ellinger wrote:
> 
> > I know the rear proportioning valve is somehow tied into the front brakes,
> > right?  So if I were toput a lock valve in the brakes, is it correct to put
> > it in line with the rear feed right under the m/c, or is there a problem I am
> > not seeing?
> 
> Yes.  There is a problem with that.  It won't hold, the minute you step
> off the pedal, your rear pressure will hit zero.
> 
> The LSPV has a "sensor" line that runs from the front brakes to the
> LSPV; it senses the front brake pressure.  It meters the rear brake
> pressure as a percentage of the front brake pressure, based on the
> height of the prop rod (on the axle).
> 
> Net result: zero front brake pressure = zero rear brake pressure.  If
> you don't put a linelock in the front brakes as well, the minute you
> take your foot off the pedal, the LSPV will see zero front brake
> pressure.  Obviously, any percentage of zero, no matter where the
> prop rod is set....
> 
> I put my linelock in the front brake line.  Since I have no LSPV any
> more either, it's not an issue, and I'm thinking about getting another
> linelock for the rear brakes (trying to hold 5200 pounds on a hill with
> only two stock brakes is marginal) but haven't yet.  I do have a prop
> valve, but it's an adjustable circle-track unit, not a Toyota item.
> 
> --scott  ellinger@frii.com
> http://www.rockstomper.com
> 
> 4x4Wire.com Toyota Section http://www.4x4wire.com/toyota/

-- 
TS
Chico, CA

Where are we going ? And why am I in this hand basket ?