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Username Post: Trailer brake coupler?
roger_27
Very Senior Member
Posts 1865
roger_27
05-08-20 01:57 AM - Post#2793156    

Heya guys!
I have a trailer brake on my truck, and j want to replace the coupler thingy that goes after the master cylinder but I don't know what size to get!

It looks like this
https://automationdistrib ution.com/wh-7900/


If nobody knows I'm just gonna throw darts until I get the right one I guess

Thanks! Rog
1980 C20 -- If it fits in a compact parking space, IT AINT A TRUCK!
1959 4 door Impala -- "You bought your dad that car? it looks like the Batmobile"
1977 Chrysler Cordoba -- It's a Mopar, but it's a nice looking Mopar!

gchemist
Member #271 Senior Chevytalk Moderator
Posts 25178
gchemist
05-10-20 04:22 AM - Post#2793363    

It's hard to know without a manufacturer. Use a caliper to measure it. Do you have a picture of it?
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE

roger_27
Very Senior Member
Posts 1865
roger_27
05-14-20 07:50 PM - Post#2793818    

hey I used a brake bleeder kit with sizes on it and identified the part should someone need it in the future.

it has 1/2-20 on both sides and a 3/8-24 on the top. it's part number 12-145 or 7906 or 47906 depending on the two manufacturers that make it. it's called a Trailer Brake Tee

Here is the product link
https://haywardsupply.com/products/12145_mm?var ian...

I will come back and post if i'm wrong and I need to look again, hahaha
1980 C20 -- If it fits in a compact parking space, IT AINT A TRUCK!
1959 4 door Impala -- "You bought your dad that car? it looks like the Batmobile"
1977 Chrysler Cordoba -- It's a Mopar, but it's a nice looking Mopar!

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