[Spridgets] Mighty vac bleeding

Tue Jul 2 04:54:36 MDT 2019

Thanks Rick,
Lin

On Sun, Jun 30, 2019 at 10:14 AM Rick Fisk <refisk at chartermi.net> wrote:

> Linda,
>
> The PDWA valve is only installed on cars with dual brake circuit master
> cylinders.  These masters have separate output lines - one for the front
> brakes and one for the rear brakes.  Your master cylinder is the older
> single output type.  One line from the master supplies pressure to both the
> front and rear brakes.  You don't have a PDWA valve, so ignore all this
> PDWA stuff.  :-)
>
> Rick
>
> Sent from my keyboard
>
> On Jun 30, 2019, at 9:30 AM, Allen Hefner via Spridgets <
> spridgets at autox.team.net> wrote:
>
> Linda, if you have the PDWA (not a proportioning valve, my bad) it is
> located near the master cylinder. It looks like a squat "H" with brake
> pipes and an electrical wire. You can look at the Moss catalog online for a
> drawing.
>
> The PDWA was originally installed on the 1275 and 1500 Spridgets. It may
> have been added to your car when the disks were installed, but you really
> have to look to see if it is there.
>
> Allen Hefner
> Norristown, PA
> Sun City Center, FL
>
> *Current:*
> 2016 Subaru outback somewhere
> 2006 Chebbie
> *Former:*
> 1963 Sunbeam Alpine Series III
> 1967 Triumph TR4A IRS
> 1964 VW Type I
> 1967 VW Type II
> 1967 Rover 2000TC
> 1977 MG Midget (Sniff!)
>
>
> On Sun, Jun 30, 2019 at 8:29 AM Linda Grunthaner via Spridgets <
> spridgets at autox.team.net> wrote:
>
>> Rick what does this mean "PDWA valve is plumbed on all Spridgets" ?
>> Being Pinky was upgraded to disc probably from a 1967 Spridget does
>> this mean, "if my rear brakes go the front still work" so is there a
>> valve somewhere in my system that shuts off the rear? If so where is
>> that valve located, what does it look like?
>>
>> I have a "Pressure Differential Warning  Assembly" not a
>> "proportioning valve" .......yes?
>> Linda
>>
>> 62 California Sprite "Pinky"
>>
>> On 6/29/19, Rick Fisk via Spridgets <spridgets at autox.team.net> wrote:
>> > Also, the way the PDWA valve is plumbed on all Spridgets you get either
>> both
>> > fronts or both rears when one circuit fails.  No diagonal splits on a
>> > Spridget.
>> >
>> > Sent from my keyboard
>> >
>> >> On Jun 29, 2019, at 5:24 PM, CosmicMag1380 via Spridgets
>> >> <spridgets at autox.team.net> wrote:
>> >>
>> >> Respectfully  disagreeing with the terminology... There is a 5 port
>> union
>> >> in the system that has a shuttle valve in it to close off a side of the
>> >> system in the event of a catastrophic failure. They came about with the
>> >> advent of disc brakes on the spridgets. The later models had a warning
>> >> light sensor built in to them. The early ones didn't have the light
>> >> fitting. They are often referred to as a proportioning valve as they
>> have
>> >> equal pressure on all ports until a sudden fluid leak and a good stomp
>> on
>> >> the brake pedal. If the pressure is low on one side of the system, the
>> >> shuttle valve is supposed to close off the bad side leaving some
>> braking
>> >> capacity because of the other side. One front wheel and the opposite
>> side
>> >> rear wheel makes up the pairs.
>> >>
>> >> Just my 2 cents if it means anything to anyone,
>> >> Kent
>> >>
>> >>> On Sat, Jun 29, 2019 at 4:10 PM Rick Fisk via Spridgets
>> >>> <spridgets at autox.team.net> wrote:
>> >>> Just a small nit guys,  but a couple of you have mentioned the brake
>> >>> "proportioning valve".  No proportioning valve on a Spridget.  The
>> device
>> >>> you're refering to is the PDWA - Pressure Differential Warning
>> Assembly.
>> >>>  It simply turns on a light to tell you if the pressure is different
>> >>> between your front and rear brakes, no proportioning.
>> >>>
>> >>> Linda's car does not have one, so ignore all of this Linda.   :-)
>> >>>
>> >>> Rick
>> >>>
>> >>> Sent from my iPhone
>> >>>
>> >>>> On Jun 29, 2019, at 3:05 PM, crusaderchuck55--- via Spridgets
>> >>>> <spridgets at autox.team.net> wrote:
>> >>>>
>> >>>> Ok it works just fine...mine does.
>> >>>> Everyone is seemingly skipping one valuable step.
>> >>>> Loosen the bleeder screw, thrn close it just enough that it's closed
>> but
>> >>>> not tight!   Attach the bleeder hose and pump up the mighty vav to as
>> >>>> much vacume the gauge will read.  Now ever so slightly crack the
>> bleeder
>> >>>> screw and watch the gauge on the mighty vav!   Just before it reads
>> ZERO
>> >>>> shut the bleeder screw.
>> >>>> Repete until you have a steady stream coming into the bleeder cup.
>> >>>> Close the bleeder after the last pull of fluid and then snug it
>> closed
>> >>>> and if ya got one, put the rubber protective cap onto the bleeder
>> nipple
>> >>>> to keep dirt out of it and move to the next wheel.
>> >>>> When bleeding a car without a proportioning valve start with the
>> wheel
>> >>>> FARTHEST from the master cylinder and work your way forward .  if it
>> has
>> >>>> a proportionong valve the same rule applies but you only do front as
>> 1
>> >>>> circuit and then the front as 1 circuit and if the proportioning
>> valve
>> >>>> goes off center...recenter it.
>> >>>> Then be certain the master cylinder is at a proper level install the
>> >>>> master cylinder cap....
>> >>>> Yer done!
>> >>>> Chuck
>> >>>>
>> >>>> Sent from my LG Mobile
>> >>>> ------------------------
>> >>>>
>> >>>> spridgets at autox.team.net
>> >>>>
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>> >>> ------------------------
>> >>>
>> >>> spridgets at autox.team.net
>> >>>
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>> >>
>> >>
>> >> --
>> >> Kent
>> >> 1960 Bugeye
>> >> 1983 Garage full of spridget parts!
>> >> 2017 Home built shed full of excess spridget parts!!!
>> >>
>> >>
>> >> ------------------------
>> >>
>> >> spridgets at autox.team.net
>> >>
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>> >
>>
>>
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>
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"Pay if forward" in honor of Frank Clarici III, Spritenut
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