Loss of brakes

[NeilMac]

Hi all recently suffered from loss of brakes on newly purchased Stag. Further investigation found a rear wheel cylinder had blown but was intrigued as to why this lead to a brake failure as system is dual circuit. I then found that the brake actuator been disconnected / bypassed. Apart from the obvious that it in its self failed at some time any ideas why somebody would bypaa it rather than replace it and risk the consequences that I experienced

[trunt]

Do you mean the pdwa? the brass thing with 5 pipes on the left wing? If they bypassed it by disconnecting the lines then perhaps they also made it a single circuit.. unbelievable!

Why? who knows.. too cheap to repair it or oblivious to what they were doing?

[sujitroy]

they are not that cheap for what they are and considering so many triumphs use them. but why would someone be that cheap with brakes.

[Seaking]

Repair kits are available for £12 that's cheap and a small price to pay for safety. I have seen them on rimmers site Repair Kit - PDWA Valve - 155071RK

[DJT]

The PDWA is just that, a Pressure Differential Warning Actuator. It isn’t a valve to close off one circuit in case of pressure loss. That is why it is important that it is wired up and operating correctly. It gives warning that pressure is lower in one circuit.

[richardthestag]

The PDWA is just that, a Pressure Differential Warning Actuator. It isn’t a valve to close off one circuit in case of pressure loss. That is why it is important that it is wired up and operating correctly. It gives warning that pressure is lower in one circuit.

Disagree here

It should not be open circuit between front and rear brakes, it should have little o-rings fitted to the shuttle to prevent fluid getting into the V where the sensor is fitted. It will only shift far enough to earth the warning light on the dash and then leave the other circuit still sealed.

I can only imagine that replacing it with a t-piece for the front brakes and a single line from master to rear axle t-piece would have exactly the same end result. i.e. only one circuit depressurised. but obviously no early warning of depressurisation of a circuit.

Bumble - were both chambers in the master cylinder empty? could be that the master is also at fault and that fluid is flowing past seals inside between the two circuits



I wonder if a monkey replaced the PDWA with a 4 way to connect the two circuits together .....

[trunt]

I wonder if a monkey replaced the PDWA with a 4 way to connect the two circuits together .....

That’s what I was wondering..

Another possibility is that the plastic divider inside the master reservoir is cracked or broken then both sides would loose fluid..

Terry

[MandM]

I don't go on there often, but read on FB that someone was removing his as it leaked, was going to reply but so much crap on there didn't bother as they seamed to be a consensus that it was a good idea!!!

PS why would you remove something that may save your life

[new to this]

As your going to repair the braking system , be a good idea to check the brake master cylinder as well when they leak , it leaks in to the servo

Dave

[jbuckl]

I don't go on there often, but read on FB that someone was removing his as it leaked, was going to reply but so much crap on there didn't bother as they seamed to be a consensus that it was a good idea!!!

PS why would you remove something that may save your life

Agree, So much tripe being posted. Biggest concern is that classic owners all get put in the ‘dangerous’ bucket and we all get banned from the roads by the twits in charge.
Thats half+ the reason I end up replying to some F.B. Posts. Sorry if that sounds condescending. It’s a genuine concern. Especially since the mot exemption.

[KOY 23]

Careful Julian, I got banned from that group by the twits in charge for asking for justification of marketing claims made by one of them.