6066 (1960-1966) GMC Truck Club

6066 (1960-1966) GMC Truck Club (https://6066gmcclub.com/index.php)
-   Transmissions and Rear Ends (https://6066gmcclub.com/forumdisplay.php?f=10)
-   -   hydraulic clutch residual pressure valve (https://6066gmcclub.com/showthread.php?t=50985)

bostru November 10th, 2020 11:57 PM

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

Funky61 November 11th, 2020 12:48 AM

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.

bostru November 11th, 2020 01:02 AM

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

James November 11th, 2020 09:58 PM

Re: hydraulic clutch residual pressure valve
 
Quote:

Originally Posted by bostru (Post 73273)
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

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.

bostru November 11th, 2020 11:49 PM

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

James November 12th, 2020 12:48 AM

Re: hydraulic clutch residual pressure valve
 
Quote:

Originally Posted by bostru (Post 73279)
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

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.

bostru November 12th, 2020 01:01 AM

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

Funky61 November 12th, 2020 06:33 PM

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.

jagarra November 12th, 2020 07:49 PM

Re: hydraulic clutch residual pressure valve
 
These are available. https://www.speedwaymotors.com/Wilwo...gs,233816.html

bostru November 12th, 2020 09:44 PM

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


All times are GMT +1. The time now is 05:15 PM.

Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.