[6pack] PDW Switch

Fri Jun 2 17:00:46 MDT 2017

Yup that agrees with what everyone is saying.

Extreme Parts Racing (more than just a haircut)

71TR6 CC57365 (Good 6)
71 Spitfire MK IV Race Car #3
69 Spitfire MK III (back up FE engine/dinghy car)
93 Minnie Winnie Race Support Vehicle 
77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)

On Jun 2, 2017, at 2:46 PM, Robert Mcbride <rmcbride at mi.rr.com> wrote:

> My point was that without pushing the pedal it will not warn you..   So getting a brake line cut while driving down the street it will not tell you it's been cut till you push the pedal..
> 
> Sent from iPad
> 
> On Jun 2, 2017, at 4:21 PM, Bud Rolofson <levilevi at comcast.net> wrote:
> 
>> Actually it does work as a pre-warning. I had a rear brake cylinder leaking and the PDWA warning light came on and made me go find out why, even though the brakes felt no different. The pedal moves the barbell which moves the switch. That's how it works.  Most failures are not a catastrophic event so the pedal will have most likely been used in some manner and the warning light would  be on if there was a problem.  But in any case the operator is still responsible for doing something, which was the original question, not the PDWA.
>> 
>> Sent from my Commodore 64
>> 
>> On Jun 2, 2017, at 12:30 PM, Robert Mcbride <rmcbride at mi.rr.com> wrote:
>> 
>>> Switch doesn't do anything till you push the brake pedal..  So no pre-warning..  It just tells you that the reason you didn't stop fast enough was because of a brake problem. 
>>> 
>>> Sent from iPad
>>> 
>>> On Jun 2, 2017, at 1:18 PM, Bud R via 6pack <6pack at autox.team.net> wrote:
>>> 
>>>> Tim,
>>>> 
>>>> The PDWA/warning light serves, just as you say, to provide information. Any action taken is the operator’s responsibility not the gage’s.
>>>> 
>>>> I know of no gage or warning light (for a 46 yo technology) that “provides any help” other than to inform.  Gas gages don’t fill the tank, water temp gages don’t make the cooling system cool better, ammeters don’t charge the battery, so expecting the PDWA to provide help to the brakes is beyond it’s reason for being there. 
>>>> 
>>>> Losing brakes is not always obvious. Running over something that cuts a brake line may not be apparent until you have to stop a few miles down the road, so having a warning light is helpful if the operator is doing due diligence and checking the gages/lights every so often. Twice I’ve had a brake booster go out on me and didn’t know it until having to stop and while the PDWA wasn’t involved in that, the surprise of not having good brakes was just the same. I don’t like surprises like that.
>>>> 
>>>> 
>>>> Bud 
>>>> 
>>>> Extreme Parts Racing (more than just a haircut)
>>>> 
>>>> 71TR6 CC57365 (Good 6)
>>>> 71 Spitfire MK IV Race Car #3
>>>> 69 Spitfire MK III (back up FE engine/dinghy car)
>>>> 93 Minnie Winnie Race Support Vehicle 
>>>> 77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)
>>>> 
>>>> On Jun 1, 2017, at 5:45 PM, Timothy Holbrook via 6pack <6pack at autox.team.net> wrote:
>>>> 
>>>>> Why is it a bad idea to remove the PDWA? Does it serve any purpose other than to inform the driver of the obvious "you've just lost half your brakes"? 
>>>>> 
>>>>> My understanding is that PDWA simply provides a ground for the warning bulb, such that it illuminates when you've had a sudden loss in either the front or rear brakes. It won't provide any help though, right?  I doubt the driver will even notice that the light has illuminated, he/she will be too busy looking for a safe way to bring the car to a stop! 
>>>>> 
>>>>> Tim Holbrook
>>>>> 1971 TR6
>>>>> 
>>>>> 
>>>>> 
>>>>> On Thursday, June 1, 2017, 6:55 PM, Bud Rolofson via 6pack <6pack at autox.team.net> wrote:
>>>>> 
>>>>> The switch doesn’t actually (and was not intended to) seal anything in the PDWA, the o-rings on the barbells internally seal the fluid in the PDWA. Replace those and center the barbell and the switch should be fine. I have the o-rings (not the cupped version) for the PDWA, send me an address and I’ll mail you some. Oh and I would NOT eliminate the PDWA unless you have the worlds best emergency brake, and then even then probably not.
>>>>> 
>>>>> Bud Rolofson
>>>>> 
>>>>> Extreme Parts Racing (more than just a haircut)
>>>>> 
>>>>> 71TR6 CC57365 (Good 6)
>>>>> 71 Spitfire MK IV Race Car #3
>>>>> 69 Spitfire MK III (back up FE engine/dinghy car)
>>>>> 93 Minnie Winnie Race Support Vehicle 
>>>>> 77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)
>>>>> 
>>>>> On May 31, 2017, at 3:40 PM, Alex&Janet Thomson via 6pack <6pack at autox.team.net> wrote:
>>>>> 
>>>>>> Lists – I know I saw some discussion several months back about repairing/replacing the brake Pressure Differential Warning switch. Naturally, it was not an issue with me then and I didn’t save the responses. At any rate, there is brake fluid leaking out of the actual switch that screws into the PDW block. I noticed that Moss has new ones (aluminum) for $439 and repair kits for the older brass units (such as ours) for $13. Any thoughts on the best avenue to take? Has anyone simply eliminated the assembly and connected the brake lines with couplings, front-to-front and back-to-back? The subject is a ’73 TR6. Thanks.
>>>>>>  
>>>>>> Alex Thomson
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