bracket thing-ama-bobber on top of pumpkin??

[90blzr]

Looking under my cousins '87 suburban last night and saw a braket coming off the top of the rear axle on the pumpkin. It swivels and it appears it is hooked directly above to a bracket on the frame where two, what appear to be brakelines hook into...
Anyone know what this is? I've never noticed it before!

 

[zakk]

just a bracket that keeps the brakelines tucked up near the frame. I think it also holds the block that the two brakes connect into.

 

[83ZZ502_Jimmy]

Its a height sensing proportioning valve. When you add weight to the rear of the vehicle it allows more fluid to flow to the rear brakes. When empty it keeps them from locking up.

John

 

[90blzr]

no, this is different zakk, this is a big arm thats about a foot long or so...

 

[90blzr]

Yup thats sounds like it!! Never noticed anything having it before! Do all Suburbans have them? Do the trucks have them too? I know my Blazer doesnt.

Does it actually work? /forums/images/graemlins/confused.gif Sounds like it would /forums/images/graemlins/thumb.gif

 

[83ZZ502_Jimmy]

Some trucks came with them some didnt. Dont know what years it started what had to be ordered to get it etc...
I saw an 86 burb that had one. I've seen a couple of p/u's with them too, never on a blazer yet...
They are supposed to work, but with GM things can go bad after awhile. When it does work it helps alot.

My .02
John

 

[thatK30guy]

Mychal, what John said holds true. Almost all of the 3/4 tons from somewhere around '81 on up have them and almost all the 1 tons have them too. When I say "almost", I've seen more of them having these setups and a few have not because the owners have taken them off to get rid of them. They can be a "pro and con" thing. I don't use them because you can only lift the truck so high before the bracket is fully extended and sending the wrong signals for the braking. You can keep the setup by fabbing a longer bracket to compensate for the lift.

My '85 K30 used to have it but the PO removed when he installed the lift. The '88 V30 in the yard does not have it as I think Bruce (Batmanjr) may have removed it. I'm not planning to reuse it. Just one less headache out of the way. /forums/images/graemlins/wink.gif /forums/images/graemlins/thumb.gif