Spitfire & GT6 Forum

Welcome! Sign In Register
Please Sign In or Register to Search

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 ??? -_-
. You can hide this ad & support this site by upgrading to a Gold Membership ~ click here for more info
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 ..
. You can hide this ad & support this site by upgrading to a Gold Membership ~ click here for more info
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 :/
. You can hide this ad & support this site by upgrading to a Gold Membership ~ click here for more info
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.
. You can hide this ad & support this site by upgrading to a Gold Membership ~ click here for more info
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 12/26/2013 01:34AM 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 12/26/2013 08:56PM by Yellowhawk Valley.

Attachments:
78 PDWA07.JPG (27.6 KB) –
78 PDWA07.JPG

78 PDWA08.JPG (29.6 KB) –
Please Sign In or Register to view this photo
78 PDWA13.JPG (26.5 KB) –
Please Sign In or Register to view this photo
78 PDWA12.JPG (29.2 KB) –
Please Sign In or Register to view this photo
wimpus Avatar
Wim De Pus
Dendermonde, east-flanders, Belgium   bel

I've looked yesterday and it's like on the picture , i even can see the 2 circlips on the piston itself true the hole :/
britsnspits Avatar
Michael Stoliker
Bethlehem, PA, USA   usa
1976 Triumph Spitfire 1500 "The Phoenix"
1978 Triumph Spitfire 1500 "Lucky"

Then your switch may simply be gummed up from the previous leakage.



I just checked and my can of whoop-ass is past it's use-by date.
wimpus Avatar
Wim De Pus
Dendermonde, east-flanders, Belgium   bel

i've checked the switch, it's working find and took it apart before i tested it .
britsnspits Avatar
Michael Stoliker
Bethlehem, PA, USA   usa
1976 Triumph Spitfire 1500 "The Phoenix"
1978 Triumph Spitfire 1500 "Lucky"

If the valve is centered...
and the switch is good...
and pulling the wire off the switch puts the light out...

Then you must have conductive air inside the switch. Test for this by removing the switch, reconnecting the wire to the switch, and grounding the body of the switch to any convenient metal surface.

If the light goes on the air in the switch has become conductive. This is similar to the fabled Lucas smoke, and since the air in the switch is non replaceable you must replace the switch.

If the test fails then you have gremlins and must perform an exorcism.



I just checked and my can of whoop-ass is past it's use-by date.
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

Ah Wim, there's the error. Should have tested if BEFORE taking it apart. It could be that whatever was causing the ground opened up when you separated the switch. How far do you have to move the plunger to get the switch to ground and turn OFF the light? It should be on until you move the plunger up about 1/16 inch or eve less.
Dan
. You can hide this ad & support this site by upgrading to a Gold Membership ~ click here for more info

Reply to this topic or post your own questions!

Members Sign In if you've already registered, or

Register a New Account

Registration is free and takes less than a minute

Having trouble posting or changing forum settings?
Check the Forum Help File (FAQ) or contact the webmaster.


Join The Club

Sign in to ask questions, share photos, and access all website features

TRExp Menu

What's New

Membership

Forums ->

The Pub

Buy, Sell & Trade

Vendor Market

Spitfire & GT6

TR6 & TR250

TR7 & TR8

TR4 & TR5

TR2 & TR3

Herald & Vitesse

Stag, 2500 & 2000

Triumph Pre-War

Odds & Ends

List Archives

Motorsports

Meetup

Forum Search

Random Topic

Latest Posts

Live Chat

Calendar

Journals

Tech Library

Car Registry

Cars For Sale

Model Info

Directory

Member Map

TRExp Store

Search Site

Advertising Info

Smartphone quick link
trexp.mobi

Adjust Text Size

Larger Smaller
Reset Save