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check valve and proportioning valve
#1305631 Tue Apr 02 2019 12:44 AM
Joined: Feb 2019
Posts: 41
8
87GN Online OP
nothing beats a try but a failure
So, I am at the point on my rebuild were I am installing the plumbing. I did not replace the original single bowl master cylinder with another. A double bowl MC is installed. Should there be a check valve and a proportioning valve?

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1955.1 3600 5 window 4 speed all original.
Re: check valve and proportioning valve
87GN #1305637 Tue Apr 02 2019 01:25 AM
Joined: Nov 2005
Posts: 5,837
3
3B Offline
Master Gabster
Hy 87GN, I am going to assume that you are working on a 1955.1 3600, by your pictures and your signature line, please remember to give us that information when you ask questions. What was the master cylinder you installed originally intended for? Are you going to have drum brakes all around or will you be doing a disk brake conversion?

Re: check valve and proportioning valve
87GN #1305645 Tue Apr 02 2019 02:09 AM
Joined: Apr 2005
Posts: 9,323
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
If you are doing drums all the way around no extra valves are required. 🛠


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Re: check valve and proportioning valve
Justhorsenround #1305676 Tue Apr 02 2019 08:29 AM
Joined: Dec 2014
Posts: 752
M
Shop Shark
Originally Posted by Justhorsenround
If you are doing drums all the way around no extra valves are required. 🛠


I agree, but may I add a couple of possible exceptions he might want to be aware of?

If the master cylinder is lower than the wheel cylinders you would need an inline check valve to prevent backflow. I also think there would be a little quicker brake response with 10-lb inline residual pressure valves front and rear to offset drum brake spring tension.


1949 Chevy Panel Truck
Re: check valve and proportioning valve
87GN #1305682 Tue Apr 02 2019 11:40 AM
Joined: Feb 2019
Posts: 41
8
87GN Online OP
nothing beats a try but a failure
Yes, all 4 of the drum brakes will be reinstalled completely new. The dual bowl MC is mounted in the original location except for the mounting bracket that came in the kit. The wheel cylinders are below the MC as it sits on level ground but they would not be below the MC on a hill. The double bowl MC intention was to provide a second chance to stop if a failure accrued in one of the lines. I know it's not original and I had to make that hard decision to make this alteration to the master cylinder.


1955.1 3600 5 window 4 speed all original.
Re: check valve and proportioning valve
87GN #1305688 Tue Apr 02 2019 12:42 PM
Joined: May 2005
Posts: 9,147
G
.
The original master cylinder and some replacements already have residual pressure valves built in.
Find out what you have before adding other things.

A check valve is a bad idea, unless you want your brakes engaged always.

The residual pressure valves are a type of check valve but only hold the listed pressure, freely return excess pressure. The brake shoe return springs should be able to provide more pressure than the valve is rated for.


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1948 Chevrolet 6400 [stovebolt.com] - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup [stovebolt.com]
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Re: check valve and proportioning valve
87GN #1305759 Wed Apr 03 2019 12:14 AM
Joined: Sep 2018
Posts: 66
J
Wrench Fetcher
I went to a double mc and stayed with drums and had to add 10lbs residual check valves. I added one to the front line and one to the rearclose to the mc. I was told to add 2 on the front line after the split and then add a proportion valve but I didn’t go that route. They work great now, before the check valves I couldn’t get any pressure from the pedal. Now it’s good and firm.


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