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#Post#: 97889--------------------------------------------------
Re: Series Three brake pressure differential warning switch
thingy
DIR By: ferretjuggler
Date: June 8, 2015, 2:01 pm
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TBH I'm not even sure how a series three with dual circuit
brakes is configured.
IIRC some cars have a diagonal split, but I can't ever recall
seeing dual pipes to the rear axle of a leafer, so I'm
concluding that the split is front/rear.
It looks like the PDWA valve also doubles up as a union/splitter
for the brake pipes.
So at one end you have a pipe from the m/cyl in and two pipes
out for the front brakes, and the other end one in and one out
for the rear brakes.
Certainly at the rear pipe end there's no way that it can cut
off the flow.
There's simply a split nylon spacer thing around the moving
piston.
It's not designed to seal anything, fluid can pass through the
gaps in it.
If the piston moves up the other end, it could possibly block
the flow to the union in the centre, but the "seal" would just
be metal to metal - not very clever ???
#Post#: 97894--------------------------------------------------
Re: Series Three brake pressure differential warning switch
thingy
DIR By: NiteMare
Date: June 8, 2015, 3:09 pm
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they require a dual circuit master cylinder (which i guess you
already know) they weren't fitted with a single line master
cylinder
when i "upgraded" to a dual line system i didn't bother with the
PDWA i just plumbed straight from the m/c to the front and rear
brakes, it's worked fine for the last 3 or 4 years
#Post#: 97896--------------------------------------------------
Re: Series Three brake pressure differential warning switch
thingy
DIR By: Serious Series
Date: June 8, 2015, 6:05 pm
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Never had one of these but is it not the case that the fluid
reservoir has a baffle in it so that when one part of the system
has a leak the other still has sufficient fluid to allow the
master cylinder to pressurise the other part of the system.
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