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PDWA valve

Posted by wimpus 
wimpus Avatar
Wim De Pus
Dendermonde, east-flanders, Belgium   bel

Hi!

Got some troubles (again) with the valve...

2 times the seals where leaking inside , but now the right seals are in it !
Now this morning did a good drive (also is my daily driver).
This afternoon the brake light came on, got the switch itself out of the valve, not fluid there !
Looked with a mirror to the inside, piston sits good in the middle ..

So i think it's more a electrical problem or something :/

What can it be ??? -_-

1147cc Avatar
Douglas Hansen
Westminster, SC, USA   usa
1958 Triumph 10
1958 Triumph TR3A
1958 Triumph TR3A
1961 Triumph TR4
1963 Triumph Spitfire 4 (MkI) ~ For Sale ! ~   → more

Does your handbrake have a switch on it for the light too?



Douglas Hansen
http://www.1147cc.com

wimpus Avatar
Wim De Pus
Dendermonde, east-flanders, Belgium   bel

In reply to # 930522 by 1147cc Does your handbrake have a switch on it for the light too?

Handbrake hasn't got a switch, the light on the dash is only for that brake pressure valve ..

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jdeatsch Avatar
Jim Deatsch
Penfield, Neu Yawk, USA   usa
1979 MG MGB

Did you check the PDWA switch?

wimpus Avatar
Wim De Pus
Dendermonde, east-flanders, Belgium   bel

well going to test the switch itself tomorrow (hopefully it's that !! )
Otherwise i don't know .. hopefully the valve is not at fault or anything 'again'..

Been out in the car this evening, braked on a straight road and seems to still brake good like before :/

spitfire50 Avatar
Paul Mugford
Rochester, N.H., USA   usa

Wim,
Start easy. Is the light out when the switch is unplugged? If it isn't, there is a wiring problem. Is the oil pressure light on too? If it is you have low oil pressure or maybe a failed oil pressure switch.
All the best,
Paul

Falkkon Avatar
JP Robert
Calgary, Alberta, Canada   can

Is why I got rid of mine. I figure if your brakes don't work, you *know* that your brakes don't work. Because they don't work. I don't need a light to tell me that.

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Yellowhawk Valley Avatar
Dan A
walla walla, washington, USA   usa
1969 Triumph Spitfire "Walla Walla"
1969 Triumph Spitfire "Portland"
1972 Triumph Spitfire MkIV "Spokane"
1975 Triumph Spitfire 1500 "Dayton"
1978 Triumph Spitfire 1500 "Bellevue"   → more

If the shuttle was /is centered then it did not turn on the light - or more correctly did not activate the switch. You should be able to manipulate the switch and turn the light on and off manually. As Paul says, if you unplugged the wires and the light stayed on, it is elsewhere, if it turned off, then it is the switch (maybe full of fluid and gunk).
If the problem is elsewhere you should likely have some indication in the oil pressure light as well.
That switch should come apart and is cleanable, My 78 did anyway.
Dan

wimpus Avatar
Wim De Pus
Dendermonde, east-flanders, Belgium   bel

Well i unplugged it and looked and the light got off then ..
But going to look at the switch this morning, really hope it's that!
Otherwise it's going to be the 4th time bleeding brakes in a year ! (3rd time in 2 months !)

Oil light is not on, i've looked at that first also winking smiley



Edited 1 time(s). Last edit at 2013-12-26 01:34 AM by wimpus.

wimpus Avatar
Wim De Pus
Dendermonde, east-flanders, Belgium   bel

This morning i looked ..

The piston seems to be in the right position and i can't get it to another side :/
I've asked a friend to look with a mirror when i pushed the brake pedal, piston not moving ..

Switch still works great !

Can it be that the piston is maybe moved a mm or so and that's why it's making contact ? :s

Brakes still work good and clean brake fluid .

Growe58 Avatar
Greg Rowe
Hatfield, PA, USA   usa

It will only move when there is a pressure differential so you have to crack a bleeder valve before it will move. Just pushing on the brakes won't do anything. You may be right that visually it looks centered but in fact isn't. Did you try the procedure in the manual to center it? Since you don't know which way it's off, open a bleeder on one side, press the brakes down a small amount and get it off center. Then close that bleeder and open one on the other side and gently re-center it.

I'm with Falkkon, mine is unplugged so I've never actually centered one myself.

wimpus Avatar
Wim De Pus
Dendermonde, east-flanders, Belgium   bel

before with the wrong seems i could re-center it with a screwdriver, had a try.. but that seems very difficult :/
maybe will try and bleed it again then ..

grubscrew Avatar
grub screw
The suburbs of, Winfield, Maryland, USA   usa

You mention several times that you think you have to bleed the brakes all over again.
I would not do that.
I would first focus on centering the PDWA piston correctly.
You will probably not be able to do that with a screwdriver unless you crack open a bleeder, as has been explained above.



Dave
1970 Spitfire Mk3
FDU 78359L
34/11 (Jasmine yellow/Black interior)

wimpus Avatar
Wim De Pus
Dendermonde, east-flanders, Belgium   bel

Well i was scared that there again was something wrong with the seals or something on the valve that i needed to bleed the brakes again (my one helper has said she wanted money now to push the brake pedal grinning smiley )

Going to see tomorrow winking smiley

Yellowhawk Valley Avatar
Dan A
walla walla, washington, USA   usa
1969 Triumph Spitfire "Walla Walla"
1969 Triumph Spitfire "Portland"
1972 Triumph Spitfire MkIV "Spokane"
1975 Triumph Spitfire 1500 "Dayton"
1978 Triumph Spitfire 1500 "Bellevue"   → more

Wim: yours should look like this. If you can see into the center of the valve, the notch in the shuttle is large enough, as is the switch hole, that it will be obvious if it is off centered enough to trip the switch. If it is not visually centered, a center punch or set pin of small diameter will fit in there and move it. I included a couple pics of the switch as well. Hope they help with that part.
Dan



Edited 1 time(s). Last edit at 2013-12-26 08:56 PM by Yellowhawk Valley.


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