Brakes - Improved Pedal Feel
88chevy18GMC NUMBER: 88-T-165
GROUP: 5-Brakes
DATE: September, 1988
CORPORATE
NUMBER: 865012
SUBJECT: BRAKE FEEL
MODELS: 1985-88 M VANS WITH POWER BRAKES
A new brake pedal assembly and booster has been released to change the feel of the brakes on M Vans equipped with power brakes. This new assembly and booster increases the pedal height and gives the impression of a firmer pedal by altering driver ergonomics. All vehicles built with power brakes after the following breakpoints are manufactured with this new pedal assembly and recalibrated brake booster.
Model Year Plant VIN
1988 Baltimore JB520855
FIGURE 1:
FIGURE 2:
SERVICE PROCEDURES:
Follow the removal and installation procedures for Brake Pedal Replacement in the 1988 Light Duty Truck Safari Models Service Manual X-8830.
1. Remove the brake pedal assembly as per the instructions in the Service Manual.
2. Remove the vacuum booster assembly as per the instructions in the Service Manual.
3. The master cylinder can be unbolted and moved out of the way without disconnecting the brake lines or totally removing the master cylinder.
4. Inspect the following parts for wear and replace as necessary:
a. bushing - pivot shaft (Figure 1-2)
b. retainer - pivot shaft (Figure 1-1)
c. retainer - booster push rod (Figure 1-9)
d. gasket - booster mounting (Figure 2-2)
5. Discard the following parts:
a. old brake pedal (Figure 14)
b. old vacuum booster (Figure 2-3)
c. old actuator (not pictured)
Note: A separate stop lamp actuator bracket is not supplied for this service procedure as this bracket is now an integral part brake pedal assembly.
6. Install new brake vacuum booster per Service Manual instructions.
7. Bolt master cylinder to new brake vacuum booster.
8. Install new brake pedal assembly per Service Manual instructions.
9. Adjust the stop lamp switch per Service Manual instructions.
Note: Always ensure that the brake system is operational after performing brake work before returning the vehicle to the customer.
PARTS INFORMATION
Part Number Description Quantity
15617145 Pedal and lever package 1
18012882 Booster ASM-Power brake 1
15598962 Bushing-Pivot shaft 2
15598965 Retainer-Pivot Shaft 1
1244707 Retainer-Booster push rod 1
9791640 Gasket-Booster Mounting 1
Note: The new booster assembly can be identified by the assembly code "LM" on the part.
All parts are currently available from GMSPO.
WARRANTY INFORMATION
Labor Operation Description Time
H1200 Booster Assembly Replace 0.6 Hr.
H2640 Brake Pedal Replace 1.4 Hrs.