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6400 brakes
#1371121 Wed Jul 29 2020 10:21 AM
Joined: Jun 2016
Posts: 213
O
Shop Shark
i have a barn find '52 6400 (2 ton) that has all the brake lines removed. I need to replace them, but with 2 wheel cylinders on each of rear wheels, I'm not sure how to do it. Does anyone have a diagram? I plan to use a dual cylinder master that I already have. Also, will it matter what order you bleed the brake slave cylinders, other than start with the furthest and move toward the master?


1954 Chevy custom 261CID, T-5 5 Speed.
1952 Chevy 6400 2 ton hydraulic flat bed.
Re: 6400 brakes
oldieoldie #1371134 Wed Jul 29 2020 11:58 AM
Joined: Sep 2001
Posts: 30,487
ace skiver
Wait to hear from other members.

However, the 1952 big-truck brakes might be the same as 1951 brakes:
http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0520.htm


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: 6400 brakes
oldieoldie #1371145 Wed Jul 29 2020 02:03 PM
Joined: Nov 2005
Posts: 5,777
3
3B Offline
Master Gabster
Hy oldieoldie, How large is the bore on the dual master cylinder you plan to use? I would not go smaller on the bore than the bore of the original master cylinder. Depending on whether your truck has Bendix or Wagner brakes, the connection at the rear wheel backing plate will be different. Yes there is a specific order to bleed the braking system with a Hydravac. Do you plan on installing two Hydravac's, one for each braking circuit, or will you install a vacuum booster in front of your new master cylinder?

Re: 6400 brakes
oldieoldie #1371285 Thu Jul 30 2020 10:36 AM
Joined: Jun 2016
Posts: 213
O
Shop Shark
I talked to a man at the last reunion about the dual chamber master and ordered what he suggested. I am going to use a booster and remove the hydrovac. The truck has Huck brakes. I sent pictures when I first got the truck and others here confirmed they are Huck brakes.


1954 Chevy custom 261CID, T-5 5 Speed.
1952 Chevy 6400 2 ton hydraulic flat bed.
Re: 6400 brakes
oldieoldie #1371344 Thu Jul 30 2020 06:42 PM
Joined: Apr 2007
Posts: 791
L
Shop Shark
Huck brakes do not have 2 cylinders per wheel and stopped being used on 2 ton trucks after 1950.
Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix
Re: 6400 brakes
oldieoldie #1372238 Thu Aug 06 2020 12:27 AM
Joined: Jun 2016
Posts: 213
O
Shop Shark
I posted a picture here several months ago and was told that these are Huck brakes. One of the people said I would find I needed 2 wheel cylinders for each of the rear hubs. Officially, Huck brakes ended witht the 1950 model, butI found out that due to extra parts being available, some 2 ton models had Huck brakes as late as 1953, though very few. I never looked at the rear wheels until now and there is only 1 brake line going in to each of the rear wheels. I haven't opened them yet, but I assume that means only one wheel cylinder.


Thanks to everyone for their input.


1954 Chevy custom 261CID, T-5 5 Speed.
1952 Chevy 6400 2 ton hydraulic flat bed.
Re: 6400 brakes
Lightholder's Dad #1372247 Thu Aug 06 2020 01:26 AM
Joined: Sep 2001
Posts: 30,487
ace skiver
Originally Posted by Lightholder's Dad
Huck brakes do not have 2 cylinders per wheel and stopped being used on 2 ton trucks after 1950.
Kent
Chevrolet Truck Brakes through 1951 [chevy.oldcarmanualproject.com]
1952 Chevrolet Truck Brakes [chevy.oldcarmanualproject.com]


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]

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