Servo parts

[justthisguyhere]

Hey all I was trying to bleed the breaks today and rear breaks wouldn't bleed so I have removed the two hoses I beleave to be responsible and will order more and hopefully that fixes things buuut I found another issue when looking at the break servo I'm pretty sure there was a spring on top and it's missing parts...I'm just not sure what...if someone could tell me what I'm missing so I can try source the parts of be very greatfull here is a picture of the part I'm beleaveing is missing partsanyone know what I'm missing and where I could source the parts? Thanks in advance

 

[Tom W]

Yes, you’re missing the spring, and the cap and filter. You probably can’t get the missing bits on their own, but the whole thing is called the reaction valve, or servo air valve, and is available. I think the same one was also used on 60s Jaguars. It looks the same. That might give you some more options on where to source one.

 

[justthisguyhere]

Yes, you’re missing the spring, and the cap and filter. You probably can’t get the missing bits on their own, but the whole thing is called the reaction valve, or servo air valve, and is available. I think the same one was also used on 60s Jaguars. It looks the same. That might give you some more options on where to source one.

thanks for the info I could probably use any spring? Maybe buy this part here to fit?
I'm guessing the filter goes on the inside? But I'm not sure...I looked at some diagrams but seems there is a dual and a single type or maybe one has the filter on and I'm just understanding

 

[Tom W]

The filter is inside the cap you’re missing, as is the spring. It looks like the filter is included on that image. The spring should be included too. Don’t use any old spring, it’s weight is important to get the servo to operate correctly.

 

[Tom W]

The spring and filter don’t appear as loose items on the exploded diagram as it’s not necessary to dismantle the reaction valve. If it goes wrong, you replace the whole thing, along with the diaphragm.

 

[justthisguyhere]

The spring and filter don’t appear as loose items on the exploded diagram as it’s not necessary to dismantle the reaction valve. If it goes wrong, you replace the whole thing, along with the diaphragm.

Well if I get the part shown in the photo it's just some easy screws and switch the parts and it's done? I shouldn't be able to mess too much up if just replacing the top...right?
That has all the parts I need too so it's tempting...but if I screw up then its a whole new reaction valve?

 

[Tom W]

It’s not hard to change, but as it’s the brakes you need to be competent and confident in what you’re doing.

The bit your buying is most of the reaction valve. The only other bits to it are the metal back plate and the plastic plunger the diaphragm fits onto. I think the plunger is available as a separate item if you find there’s something wrong with yours, and there’s not much to go wrong on the metal plate.

The plastic piece secured by the screws visible from the outside and the vacuum hose. Make sure you get the new diaphragm the correct way around, and that the diaphragm is located properly on the plunger and between the plastic and metal halves. Don’t over tighten the screws and crack the plastic housing.

Do you have a workshop manual?

 

[MikeMelb]

Yes, you’re missing the spring, and the cap and filter. You probably can’t get the missing bits on their own, but the whole thing is called the reaction valve, or servo air valve, and is available. I think the same one was also used on 60s Jaguars. It looks the same. That might give you some more options on where to source one.

Just a caution, I bought a whole new unit from JagDaim in Melbourne as I needed to replace the diaphragm a few years back. Because the car was not being used continuously when I next took the car out it was running very rough. Went through all the diagnostics, replaced plugs, leads, rotor, lumenition chopper, over a period of months all to no avail.
Mech thought it may be a vacuum leak in the servo and Mike Coombs previously supplied a recond Servo unit which I decided to use and I switched the new reaction valve onto it before installing it but that did not resolve the problem.
Decided to have my original servo reconditioned so took the new reaction valve off the Mike Coombs servo and replaced it with Mike's old reaction valve (so that the specialists could attach the new valve) and the problem was resolved.

The specialists confirmed that the new valve was a dud and replaced it. So suggest check the valve before accepting it if you can.

 

[justthisguyhere]

It’s not hard to change, but as it’s the brakes you need to be competent and confident in what you’re doing.

The bit your buying is most of the reaction valve. The only other bits to it are the metal back plate and the plastic plunger the diaphragm fits onto. I think the plunger is available as a separate item if you find there’s something wrong with yours, and there’s not much to go wrong on the metal plate.

The plastic piece secured by the screws visible from the outside and the vacuum hose. Make sure you get the new diaphragm the correct way around, and that the diaphragm is located properly on the plunger and between the plastic and metal halves. Don’t over tighten the screws and crack the plastic housing.

Do you have a workshop manual?

I have just got my hands on a workshop manual and had a quick look through...the part I'm needing to remove and replace seems easy enough if I'm careful and don't over tight then screws like you said...i left the book in the car and it's not currently here at home with me so I'll have to wait till tomorrow to have a good look through the servo parts I found another cap at rimmer bros that looks the same...but not sure it is I sent them an email to ask if it will fit so hopefully they know...here is the part

 

[justthisguyhere]

Just a caution, I bought a whole new unit from JagDaim in Melbourne as I needed to replace the diaphragm a few years back. Because the car was not being used continuously when I next took the car out it was running very rough. Went through all the diagnostics, replaced plugs, leads, rotor, lumenition chopper, over a period of months all to no avail.
Mech thought it may be a vacuum leak in the servo and Mike Coombs previously supplied a recond Servo unit which I decided to use and I switched the new reaction valve onto it before installing it but that did not resolve the problem.
Decided to have my original servo reconditioned so took the new reaction valve off the Mike Coombs servo and replaced it with Mike's old reaction valve (so that the specialists could attach the new valve) and the problem was resolved.

The specialists confirmed that the new valve was a dud and replaced it. So suggest check the valve before accepting it if you can.

I have had the engine running the other day and it sounded rough...I thought it was cause I didn't tune the carbs yet...maybe that was the issue... thanks for that info probably saved me alot of hassle of pulling the wrong things apart to find the issue I'm not sure what specialists we have here but i have been told of someone semi to where I live so maybe I could drive to him to get it looked at and install anything thanks

 

[Vern Klukas]

There is only one version of the reaction valve assembly, it's a common part used on many, many British brands in the 60's & 70's.

Yours
Vern