Ok I have JB5 system and lookup says they are 6400 Lb.
Here's a picture
http://i1371.photobucket.com/albums/...g?t=1403961476
Only thing I see is the "DA" sticker. So what do I have? And how do you figure it out? I didn't see anything that explains the types of diaphragms. How does the types relate to the RPO code?
I see JB8 says 10000 Lb
That must be Hydraulic.
I found this on a bulletin board
JB5= front disc 11.86X1.29 rear drum 11.15X2.75 Vacuum-Double Diaphragm
JB7= front disc 12.50X1.54 rear drum 13.00X2.50 Vacuum-Double Diaphragm
JB8= front disc 12.50X1.54 rear drum 13.00X3.50 Hydraulic-Hydro-Boost
But how do you get part numbers for these boosters.
Then there is this:
http://www.oreillyauto.com/site/c/de...1305&ppt=C0066
It says it's 10.75" and used for JB5,6&7???? I don't get it.
Do I want the one that is 13" x 2.5? Do you look for the booster from a 1 ton truck?