Wanted: Chevrolet brake tee junction / connector / fitting

[Alex van de Wetering]

After looking around the website that Phil (thanks Phil!) posted I found a brake tee that looks identical to mine, but uses a different partnumber (594595). The master parts list also uses the same drawing for both partnumbers. (see pics attached). One seems to be used for the 1/2 ton trucks while the other (mine) was originally used on 3/4 ton trucks.

I wonder what the difference could be.....different threads for the brake lines??? or did all chevy's from the period use the same thread on the brake line fittings?......or could it be that the "branch" is different .....is the actual frame thickness different between 1/2ton and 3/4ton trucks???

I asked the obsChevy guys for thread size and overall measurements, but no responce so far.

Alex

[Alex Blair (RIP)]

Originally Posted by Alex van de Wetering

After looking around the website that Phil (thanks Phil!) posted I found a brake tee that looks identical to mine, but uses a different partnumber (594595). The master parts list also uses the same drawing for both partnumbers. (see pics attached). One seems to be used for the 1/2 ton trucks while the other (mine) was originally used on 3/4 ton trucks.

I wonder what the difference could be.....different threads for the brake lines??? or did all chevy's from the period use the same thread on the brake line fittings?......or could it be that the "branch" is different .....is the actual frame thickness different between 1/2ton and 3/4ton trucks???

I asked the obsChevy guys for thread size and overall measurements, but no responce so far.

Alex

Alex ..The threads are Pipe threads..either 1/8" or 1/4" for the bigger fittings...But you will have some combination fittings that will have the pipe tread and flare fitting threads, also the numbers could be different if the branch sizes are different or off set differently,say 45 Degrees rather than 90 Degrees or straight through ..
Then you get M and F (male and female...)
From what i CAN TELL FROM THE DIAGRAM Fitting number 3692044 would be written 1/8"Th FPT(Female pipe thread)x1/4"male compression..
fitting number 3690611 would be written ..1/8th"FPT(Female pip[e thread X 1/4"MF(Male flare)
The rest I would have to have in my hot little hand but the one wit5h the red pointer looks like a 1/16"FNPT (female National pipe thread) in the smallest hole but i am only guessing at that.
Good luck..I really enjoy your postings.
This will probably help..
http://www.mccullochs.com.au/userfil...tification.pdf

It may be a good Idea if you printed this out and kept it in your shop..and then people will be checking in with Alex the Thread Master (European division)..Alex The thread Master (North America) is all ready taken...