I figured it out. My '57 GMC is a model 102 (1/2 ton with
89" bed). The equivalent Chevrolet would be a model 3204.
Section 5 sheet 7.00 of the Chevrolet Truck Factory Assembly
Manual shows a connection like mine (large exterior nut
attaching the frame end of the front brake hose to the frame)
for Model 3204 and up while lower model numbers use a
different hose that attaches to the frame with the spring
clip so many of you have. Most of the other brake hydraulic
parts (lines, T fittings, etc.) seem to also be different.
Looks like the 31xx models use 3/16" hard tubing while the
3204 uses 1/4".
I was planning to replace all the hard brake lines anyway
so this was no big deal once I figured out that I needed the
spring clips from the 31xx model.
Just thought I'd let you guys know before one of you with an
89" bed half ton buys a six lug disk brake kit that supposedly
fits "47-59 half ton".
-----Original Message-----
From: Claude [mailto:cramey@n-link.com]
Sent: Friday, April 14, 2000 4:29 PM
To: oletrucks
Subject: Re: [oletrucks] Disk brake problem
My '59 only has the inside threads with a groove on the outside. It just
sticks thru the frame and is held in place by a square clip that snaps in
the groove. This is how the old ones were and the replacements matched it.
There's actually 2 clips. One on the outside of the frame ( kind of a C
clip) and one on the inside ( a flat spring type clip that slides on).
Claude
http://www.dashlink.com/~rameyfam
----- Original Message -----
From: "Hanlon, Bill" <Bill.Hanlon@COMPAQ.com>
To: "oletrucks" <oletrucks@autox.team.net>
Sent: Friday, April 14, 2000 3:25 PM
Subject: [oletrucks] Disk brake problem
> I am in the process of installing a front disk brake kit on
> my (according to VIN plate) '57 GMC 1/2 ton.
>
> The "frame end" of front drum brake hoses currently on the
> truck mount to the frame by passing through the frame and
> having a 5/8" nut attach from the inside of the frame. So
> the "frame end" of the hose is threaded on the outside to
> accept this nut as well as on the inside to accept the male
> metal brake line (3/16 NPT if I remember right) that comes
> from the master cylinder.
>
> The replacement hoses sent by my supplier of the
> brake kit have only the inside thread. The kit claims
> to be for a 47-59. When I asked the supplier to
> look at one of his regular drum type replacement
> hoses for a 57 he says the "frame" end is identical
> to the disk brake hose. However, when he pulled a
> drum brake hose for a 55-2 through 56 the "frame"
> end of the hose was like the one on my "57".
>
> Have any of you installed disk brakes on the front of
> a 55-2/56 with any luck? If so, did you run into this
> problem? If so, what did you do about it?
>
> Could one of you with 57-59 trucks take a look at
> the manner of attaching the front brake hose to the
> line coming from the master cylinder? Is there some
> kind of brass fitting inside the frame that somehow
> bolts to the frame to prevent the hose from rattling
> around? Please describe the connection from the
> front hose to the rest of the system.
>
> As always, thanks for your expertise.
>
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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