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1952 3100 Dual Master Cylinder Conversion #1325687 Wed Sep 11 2019 12:15 AM
Joined: Jul 2019
Posts: 29
S
ssaxman Offline OP
Wrench Fetcher
I'd like to convert the single-reservoir master cylinder on my 1952 3100 to a dual-reservoir master. I'll be keeping non-power, stock-style drum brakes. I found this kit at Performance Online (POL) and was wondering if anybody had used it. I've not ordered from them before so wanted to get some feedback first.

Additionally, has anybody done a write-up or have pictures of how they routed the brake lines when doing this conversion? I tried searching the interwebs and came back with lots of pics and threads about the actual master cylinder swap, but not much about running the lines. Any links, tips, tricks, or pics would be much appreciated. Thanks!!

Re: 1952 3100 Dual Master Cylinder Conversion [Re: ssaxman] #1325727 Wed Sep 11 2019 03:57 AM
Joined: Mar 2017
Posts: 169
E
Elmo Offline
Shop Shark
It is super simple to convert your single reservoir to the dual. I would really recommend the swap!! Easy peesy!!


Elmo

Last edited by Elmo; Wed Sep 11 2019 03:57 AM.
Re: 1952 3100 Dual Master Cylinder Conversion [Re: ssaxman] #1325746 Wed Sep 11 2019 01:39 PM
Joined: Jan 2016
Posts: 465
S
showkey Offline
Shop Shark
Easy peasy ??????

Maybe the swap is a “5” on difficulty scale of 1-10. But highly dependent on your skills, experience and tools available.

1. The master should “bolt right up”.........key word should.

2. You have to run a few new brake lines which means buying premade lines then bending to fit or buying line and fittings then cutting and flaring custom lines to fit. Not rocket science........but does take some skills and few common tools.
Depends on the age of the current lines........but all new lines and rubber hoses might be a good idea.

3.After it’s installed bleeding and adjustment would be similar to the stock. Even bleeding can be a challenge for some. Bench bleed the master is good idea and critical step in some situations. The height of the master compared to wheel cylinders can be part of the bleeding challenges.

Last edited by showkey; Wed Sep 11 2019 01:41 PM.
Re: 1952 3100 Dual Master Cylinder Conversion [Re: ssaxman] #1325752 Wed Sep 11 2019 02:11 PM
Joined: Feb 2001
Posts: 6,591
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WE b OLD Offline
Master Gabster
Mine has been done but I had it done. One thing I do remember is to fill it is difficult it has a plastic bottle with a long bent tube to fill from underneath. I believe because of the hole in the floor does not line up anymore so I had a remote fill installed on the engine side of the firewall. I just got back from a 1400 mile trip and I could tell the pads had worn so checked the remote fill and it was halfway down so I filled it. I always take some along.This might help


Ron, The Computer Greek
I love therefore I am.

1960 MGA Roadster Sold 7/18/2017
1954 3100 Chevy truck in the Gallery
2017 Buick Encore
Pix on Photobucket
Re: 1952 3100 Dual Master Cylinder Conversion [Re: ssaxman] #1325791 Wed Sep 11 2019 07:04 PM
Joined: Jul 2019
Posts: 29
S
ssaxman Offline OP
Wrench Fetcher
This is the kind of feedback I was looking for. The installation of the new master and bracket is pretty straight forward, but I wasn't sure if I could use the existing lines. The lines were all replaced during the restoration a few years ago. With the stock master, there's one small line that comes out of the back and goes to the left front wheel; then there's a fat line that runs to the passenger side frame rail and tees off--one line goes to the front right wheel and then one line goes to the rear axle where it tees again to go to both rear wheels. With the front wheels having completely separate lines on either side of the truck, how do I get them both on the same line to the master? It also seems like I would have to run a new line for rears from the master to the existing tee on the passenger side frame rail and probably replace that tee with a 90--removing the right front line and keeping the existing line that goes to the rear. This is why I was hoping someone had done a write-up or could share pictures of how they did their lines.

As for the remote fill, I looked into that, however all of the remote fill kits I've seen are for dual bail masters and all of the drum/drum masters are single bail so I don't think the remote fill would work. I'm not too terribly worried about this as it's not a terrible PITA to get under the truck and check the fluid so long as I have enough room between the top of the master and floorboard.

Re: 1952 3100 Dual Master Cylinder Conversion [Re: ssaxman] #1325802 Wed Sep 11 2019 09:07 PM
Joined: Mar 2011
Posts: 142
6
66flea Offline
Shop Shark
text me i have picture on my phone

Re: 1952 3100 Dual Master Cylinder Conversion [Re: ssaxman] #1325806 Wed Sep 11 2019 09:36 PM
Joined: Feb 2004
Posts: 19,025
H
Hotrod Lincoln Offline
Boltergeist
Be sure you do your homework on master cylinder and wheel cylinder diameter and stroke, and the other physical properties of the brake system. A master cylinder that's used with a power booster will be totally different in diameter and stroke than one for a non-boosted system. The size of the reservoirs will be different also. Just because somebody's willing to sell you something they claim will fit doesn't mean they'll be there with a wheelbarrow full of cash to pay your defense lawyer when your poorly-engineered brake system causes you to run over a mini-van full of curtain climbers.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 1952 3100 Dual Master Cylinder Conversion [Re: ssaxman] #1325818 Wed Sep 11 2019 10:57 PM
Joined: Jul 2019
Posts: 29
S
ssaxman Offline OP
Wrench Fetcher
Thanks for the pics, 66flea!

@Hotrod Lincoln - Definitely good advice. I've been scouring the web about this type of conversion for a few weeks now to make sure I've got my P's and Q's in order. Thank you!

Re: 1952 3100 Dual Master Cylinder Conversion [Re: ssaxman] #1325825 Wed Sep 11 2019 11:48 PM
Joined: Jan 2000
Posts: 415
S
Skooter Offline
Shop Shark
I used the POL bracket and ordered the dual master from Rockauto (for '67 Chevy pickup if I recall, was the first year for dual master??) I bought a 3 inch hole saw to cut a new access for filling the master because the POL bracket does shift it backwards a ways. Bought a second rubber floor plug for the second master hole. POL bracket was a nice piece of kit, included push rod and all bolts, everything fit nice. Will see if I can find and post a few pictures this evening.


1952 Chevy 1/2-ton 3100
Dalton Highway survivor
www.truckwithaheart.com
Re: 1952 3100 Dual Master Cylinder Conversion [Re: ssaxman] #1325828 Thu Sep 12 2019 12:02 AM
Joined: Jul 2019
Posts: 29
S
ssaxman Offline OP
Wrench Fetcher
Thanks , Skooter!

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