I
I guess - there is a ton of conflicting information on the forums. Folks are putting random master cylinders on their trucks, residual valves, all kinds of nonsense.
From the service manual for a 94 it says this:
"The master cylinder (figure 1) is designed for a system using low-drag...
Yeah
From what I've found in searches, the ABS unit on the 96's handles the proportioning function, unsure of any residual pressure to keep the shoes close to the drum.
Hipster - on pre-abs trucks, the master cyl had a little check valve in the port to hold residual pressure to keep 10psi in...
Well hmm...there isn't anything in the proportioning valve providing a residual pressure function for the back drums. The "Quick-take-up" function in the brake master cylinder takes care of the low-drag calipers on the front. I didn't see anything in the descriptions for the 4WAL system to...
I've done about as much searching as I can on this topic, but not found a definitive answer. Where is the residual valve for a 93 Yukon with the 4WAL ABS system? Is it in the master cylinder, the ABS unit, or in the proportioning valve? Is there any evidence to support one of these locations?
Actually, it's hilariously critical. If you don't set the Z-height as above, all of the other steering geometry will be off (Camber, caster, toe) etc. It's step #1 for a proper alignment.
The "trim" or Z height is actually the proper setting for the torsionbar/control arms. It's independent...
HEre man, use this:
I wrote this years ago. It's not stickied. I don't know why, either, lol.
http://www.gmt400.com/threads/tbi-sensor-diagnostic-how-to-with-a-multimeter.18225/
Bump -
Has anyone heard from the OP? I sent him the money in November, and haven't received the shipment yet. He was last online on Jan 8, 2016, which shows he's around.