hydraulic clutch residual pressure valve
 

Where can I buy a residual pressure valve for 1960 GMC Pickup with hydraulic clutch. And does anyone know what the pressure value is in P.S.I

Re: hydraulic clutch residual pressure valve
 

Welcome Bostru!

Is this valve on the hydraulic slave cylinder and would you mind posting a picture?
If it is, I know that some did not have that valve on there.
My 61 does not have one; it just has a bleeder screw.

Re: hydraulic clutch residual pressure valve
 

Truck is in storage so I can't get pics but the valve is at the slave cylinder right where the line goes into the cylinder . It is about 3/4"long looks like a brass adapter. Not all trucks used these apparently but were used in brake systems on early cars and trucks where the master cylinder was located on the frame . idea was to hold slight residual pressure (approx. 10 PSI)
on the brakes . I assume this valve does the same with clutch

Re: hydraulic clutch residual pressure valve
 

The purpose of the pressure is to make sure the wheel cylinders/slave cylinder seals from collapsing and allowing fluid to leak out. This is used on all vehicles with drum brakes/hydraulic clutch. With drum brakes it is located in the master cylinder. On the clutch I am not sure if it in the clutch master cylinder (I would think it would be here) or the slave cylinder.

Re: hydraulic clutch residual pressure valve
 

The residual pressure check valve in a brake system is to keep slight pressure applied to the brakes at all times which will reduce pedal travel and make the brakes apply quicker . (probably splitting hairs as to how much quicker) .The valve in the hydraulic clutch system works in the same way . Do you know where I can get an OE valve for the clutch on a 60 GMC with a 305 ?

Thanks for your reply

Re: hydraulic clutch residual pressure valve
 

I know a lot of website is saying the same thing. However applying brake quicker was not the original issue, it is leaking wheel cylinders. Please refer to the expert at: https://www.freeasestudyguides.com/r...eck-valve.html
This is in a practice ASE test.

Re: hydraulic clutch residual pressure valve
 

Thanks ,do you know where I can get one for my clutch and do you happen to know the value in PSI for the clutch valve

Re: hydraulic clutch residual pressure valve
 

I would check with this company

https://www.wilwood.com/Search/PartN...ual%20pressure

I’m certain they could provide more specifics as well as the valve.

Re: hydraulic clutch residual pressure valve
 

These are available. https://www.speedwaymotors.com/Wilwo...gs,233816.html

Re: hydraulic clutch residual pressure valve
 

Thanks, Funky61 and Jagarra I am aware of the aftermarket valves but am looking for an Original Equipment piece for another project N.O.S. or nice used .
Thanks again

Re: hydraulic clutch residual pressure valve
 

The slave cylinder comes in two sizes, 1" or 1-1/6". Which size do you need so we know what to look for?

Re: hydraulic clutch residual pressure valve
 

This one is 1-1/16":
https://www.summitracing.com/parts/dhb-cs36124

Re: hydraulic clutch residual pressure valve
 

Thanks, but as posted in the first post I am looking for the residual pressure valve not the slave cylinder .

Re: hydraulic clutch residual pressure valve
 

This place has both sizes, however it is listed for a 1961 instead of a 1960. The only different I see is the 1961 listing has a CS in the part number.
https://www.rockauto.com/en/catalog/...+cylinder,2044

Re: hydraulic clutch residual pressure valve
 

This day and age you might not be able to find an OEM residual pressure valve for the slave cylinder. This is why I suggest the slave cylinder. The only possibility is NOS parts on ebay, but you might have to wait for someone to list it.

Re: hydraulic clutch residual pressure valve
 

Here is information from the early manuals I have and they call it a Hydraulic Fluid Damper.

Re: hydraulic clutch residual pressure valve
 

Funky 61 ,I have located one . Thanks fo the pics, your 61 does not have one ?

Re: hydraulic clutch residual pressure valve
 

That's great news Bostru!

Where did you source one and is it factory and do you know what PSI it is?

No my slave cylinder does not have one.

Re: hydraulic clutch residual pressure valve
 

Junkyard find ,don't know anything about it . Not much info on these and the service manual doesn't tell much either .

Re: hydraulic clutch residual pressure valve
 

I found one NOS GMC:
https://www.oldsobsolete.com/product...ve-gm-5460337/

Re: hydraulic clutch residual pressure valve
 

Awesome Work James!

Re: hydraulic clutch residual pressure valve
 

Second that ,bought a junkyard piece should work fine for what I am doing but good to know I have a second choice . Can't imagine much demand for this part . Thanks for your help !!

Re: hydraulic clutch residual pressure valve
 

This is what teamwork is all about. There is not one person with all of the answer, but with everyone help we get there.

Re: hydraulic clutch residual pressure valve
 

Yes indeed!!