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Brakes on 1953 3600 3/4 ton truck
#1411656 Thu May 27 2021 11:29 PM
Joined: Mar 2017
Posts: 261
E
Elmo Offline OP
'Bolter
Ok, Here we go. I replaced the single brake master cylinder with a dual brake master cylinder. I also replaced the wheel cylinders, brake lines, hoses, springs, everything. So, I know I have drum front and rear brakes.My question is, do I need a proportioning valve? I haven't found any information on a Drum/Drum, needing a proportioning valve. If it was disc/drum then yes, you need a Proportioning valve. Help!!! If I drive down the road, And hit the brakes like in a panic mode. The rear end locks up. The front, not so much. The truck has a 235 and My new 410 gears in the rear end. I can get up to 60 miles an hour. I should probably convert to disc front brakes.



What do y'all think?
Elmo

Re: Brakes on 1953 3600 3/4 ton truck
Elmo #1411666 Fri May 28 2021 12:52 AM
Joined: Nov 2005
Posts: 5,958
3
3B Offline
'Bolter
Hy Elmo, drum/drum brake systems do not require a proportioning valve even when they are "powered" by a dual master cylinder. Rear brake lockup is pretty common in unloaded pickup trucks, especially in panic stop situations

Re: Brakes on 1953 3600 3/4 ton truck
Elmo #1411801 Sat May 29 2021 01:34 AM
Joined: Mar 2019
Posts: 1,292
G
'Bolter
Ditto to 3B. Rear lockup in panic stops are just what they do. Try alitta lower rear tire pressure if you dont use it loaded alot to capacity. Theres really nuttin to fix. They are actually working. You might even be surprised how good it stop in panic mode loaded. Makes sure the front are properly adjusted as well. Give yourself alitta space in front of you till you get familiar with the stopping availability.

Re: Brakes on 1953 3600 3/4 ton truck
glenns towing #1411809 Sat May 29 2021 02:34 AM
Joined: Mar 2017
Posts: 261
E
Elmo Offline OP
'Bolter
Thanks guy's!!! I have a feeling it's just the fact that I'm so used to the modern vehicles ability of stopping on a dime. It took me a while to get used to the way my truck steers with the NON independent front suspension


Elmo.

Last edited by Elmo; Sat May 29 2021 11:49 AM.
Re: Brakes on 1953 3600 3/4 ton truck
Elmo #1411813 Sat May 29 2021 02:51 AM
Joined: Feb 2004
Posts: 22,980
H
'Bolter
Weight transfer and traction has a lot mote to do with stopping than the design of the brake system. It's not uncommon for the front brakes on any vehicle to do 70% or more of the stopping, due to weight being transferred forward during a stop. Add to that the fact that truck brakes are designed to handle a fully loaded vehicle, and rear wheel lockup when unloaded is pretty much a given unless some finesse is applied while stopping. "Finesse" and "panic" don't always go together, but the final factor is always "traction".
Jerry


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Re: Brakes on 1953 3600 3/4 ton truck
Elmo #1411932 Sun May 30 2021 01:40 AM
Joined: Mar 2019
Posts: 1,292
G
'Bolter
Ditto again to Hotrod lincoln . Do alitta experiment. Put a ton of gravel in it and duplicate the "panic stop". You might be surprised.?.. dang

Re: Brakes on 1953 3600 3/4 ton truck
Elmo #1412142 Mon May 31 2021 03:47 PM
Joined: Jun 2011
Posts: 4,192
E
'Bolter
GM and someToyota trucks have a factory proportioning valve hooked to the rear suspension so when loaded, more rear pressure is applied. Adding one of these valves should be relatively easy. Observe how they are hooked up and then copy.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: Brakes on 1953 3600 3/4 ton truck
Elmo #1412149 Mon May 31 2021 04:27 PM
Joined: Mar 2002
Posts: 9,111
'Bolter
I found the rear wheels would easily lock up on my 1 Ton, on gravel etc. I don’t carry loads so I installed a proportioning valve for the rear. That solved the problem.


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