Pontiac tempest 1968 Service Manual page 196

5B-1
BENDIX POWER BRAKE
CONTENTS OF THIS SECTION
S U B J E C T PAGE
Checks and Adjustments on Car 5B-1
Minor Repairs » . 5B-1
Bleeding Brakes 5B-1
Stop Lamp Switch , . . . „ „ . . . 5B-1
Overhaul Bendix Power Brake 5B-1
Master Cylinder Only—Remove 5B-1
Power Brake and Master Cylinder
Assembly—Remove . • • 5B-1
Power Unit—Disassemble „ 5B-1
Power Piston—Disassemble 5B-2
Master Cylinder—Disassemble . • 5B-2
Inspection—Cleaning 5B-3
CHECKS AND ADJUSTMENTS ON CAR
1. Check for free operation of brake pedal. If bind­
ing exists, check all pivot points for binding and
lubricate as required.
2. Check stop light switch for proper setting and
operation.
3. Check fluid level in hydraulic cylinder reser­
voirs. Fluid level should be as shown in Fig. 5-6
a
4. Check vacuum line and connections at carbu­
retor and vacuum check valve for possible vacuum
leaks.
5. Check engine for good stall-free idle, and
correct as required.
MINOR REPAIRS
BLEEDING BRAKES
Brakes should be bled in the same manner as
standard brakes, but, if bleeding manually, do not
run engine.
STOP
LAMP SWITCH
See Section 5 for service.
OVERHAUL BENDIX POWER BRAKE
MASTER CYLINDER ONLY-REMOVE
Certain repair operations, such as replacement of
master cylinder internal parts, permit the master
cylinder to be removed by itself, leaving the power
cylinder on the car.
SUBJECT PAGE
Inspect Power Brake Assembly . . . . . . . 5B-3
Inspect Hydraulic Master Cylinder
Assembly 5B-3
Inspect Air Filters 5B-4
Power Unit and Master Cylinder—Assemble . 5B-4
Master Cylinder—Assemble 5B-4
Power Piston—Assemble 5B-5
Power Unit—Assemble 5B-5
Assemble Master Cylinder to Power Unit . 5B-6
Push Rod Adjustment 5B-6
Torque Specifications 5B-6
Special Tools 5B-7
1. Disconnect hydraulic lines at master cylinder.
Cover openings in master cylinder and end of both
pipes to prevent entry of dust, dirt, etc.
2. Remove two nuts and lock washers from vacuum
cylinder studs extending through master cylinder
assembly.
3. Remove master cylinder from power unit.
POWER BRAKE AND MASTER CYLINDER
ASSEMBLY-REMOVE
1. Disconnect vacuum hose from vacuum cylinder
assembly. Cover openings to prevent entry of dust,
dirt, etc.
2. Disconnect pipes from master cylinder hy­
draulic ports and cover openings in master cylinder
and end of both pipes to prevent entry of dust,
dirt, etc.
3. Remove retainer and clevis pin from brake
pedal inside the car.
4. Remove nuts and lock washers from vacuum
cylinder studs under dash and remove power brake
assembly.
5. Clean exterior of power brake assembly and
drain reservoirs of hydraulic fluid.
POWER UNIT-DISASSEMBLE (Fig. 5B-2)
1. Using old master cylinder assembly or Tool
J-22805-01, mount power brake assembly in vise,
clamping on unit so that valve operating rod is up.
2. Scribe a line across the front and rear housings
to facilitate reassembly.
3. Remove clevis from valve operating rod.