C 30 1 Ton Pickup 2WD V8-350 5.7L VIN M 4-bbl (1983)
Ride Height Sensor: All Technical Service Bulletins
Rear Suspension (Height Sensing) - Modulations
Number:
83-T-61
Section:
V
Date:
July, 1983
Subject:
REVISED REAR SUSPENSION ON VEHICLES WITH HEIGHT SENSING PROPORTIONING BRAKE SYSTEMS - 1982-83 "C/K"
30
TO:
ALL CHEVROLET DEALERS
1982-83 "C/K" 30 series trucks are equipped with a rear suspension height sensing device that optimizes the brake proportioning valve setting for the
load the vehicle is carrying. The height sensing system "fine tunes" the brake balance in vehicles subjected to a range of loading conditions.
Occasionally, vehicle modifications by body builders or owners influence the height sensing device. If a vehicle has had rear suspension modifications
that affect its trim height or the spring rate, and the driver complains about the brake modulation characteristics of the vehicle, it is recommended that the
height sensing system be removed and the brake system be revised as described below:
FIGURE #1 - REAR SUSPENSION
1.
Detach rear brake hose from lever and bracket assembly. Reference Figure #1.
2.
Remove lever assembly and bracket from axle.
FIGURE #2 - DIFFERENTIAL
3.
Install rear brake hose bracket (P/N 348978) and spacer (P/N 2355099) with a 3/8-16 x 1.38 bolt (P/N 358000 - shorter bolt removed in Step #2)
in the upper cover hole. Reference Figure #2. Use Loctite 75 or equivalent on the bolt threads.
4.
Attach brake hose to bracket with bolt from original installation.
5.
Install a 3/8-16 x 1-3/4 bolt (PIN 14055557 -- longer bolt removed in Step #2) through spacer P/N 14055556 (removed in Step #2) in remaining
axle cover attaching hole. Use Loctite 75 or equivalent on bolt threads.
