Pontiac tempest 1968 Service Manual page 184

5A-1
E L C O - M O R A I N E P O W E R B R A K E
CONTENTS OF THIS SECTION
SUBJECT
PAGE
SUBJECT
PAGE
5A-1
Inspection and Cleaning
• • • 5A-4
5A-1 Power Brake
5A-1 Master Cylinder .
Stop Lamp Switch—Remove and Replace . 5A-1 Air Filter
Overhaul Delco-Moraine Power Brake . . . 5A-1 Assemble Brake Unit
• • • 5A-5
Master Cylinder Only—Remove
5A-1
Master Cylinder—Assemble
. • • 5A-5
Power Brake and Master Cylinder
Power Piston—Assemble
• • • 5A-5
Assembly—Remove
5A-1
Gauging Procedure -
. • • 5A-10
Over-all Brake Unit—Disassemble . . . . 5A-2 Power Brake Assembly—Install . . . . . • •
5A-10
Power Piston Assembly—Disassemble . . . 5A-3 Torque Specifications
. • • 5A-10
5A-4
• • • 5A-11
CHECKS AND ADJUSTMENTS ON CAR
1. Check for free operation of brake pedal. If
binding exists, check 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
voir. Fluid level should be as shown in Section 5.
4. Check vacuum line and connections between
carburetor and vacuum power cylinder for possible
vacuum leaks.
5. Check engine for good stall-free idle. Correct
as required.
MINOR REPAIRS
BLEEDING BRAKES
Brakes should be bled in the same manner as
standard brakes, unless a balance valve is incorpo­
rated in the system.
STOP LAMP SWITCH
The stop lamp switch has a slip fit in the mounting
sleeve which permits positive adjustment by pulling
the brake pedal up firmly against the stop. The pedal
arm forces the switch body to slip in the mounting
sleeve bushing to properly position switch.
REMOVE
1. Disconnect switch wires by removing plug at
stop light switch.
2. Remove switch by turning out of bracket.
REPLACE
1. Position stop light switch in bracket and push
in maximum distance.
2. Connect switch wires by inserting plug on
switch.
3. Brake pedal arm moves switch to correct dis­
tance on rebound. Check if pedal is in full return
position by lifting slightly by hand.
OVERHAUL DELCO-MORA1NE POWER i l A K E
MASTER CYLINDER ONLY-REMOVE
Certain repair operations, such as replacement of
master cylinder internal parts, permits the master
cylinder to be removed by itself, leaving the power
cylinder pedal and brackets in the car.
1. Remove hydraulic connections from master cyl­
inder, pump fluid from cylinder into a container and
dispose of fluid. Cover cylinder openings and pipe
ends to exclude dust, dirt, etc.
2. Remove master cylinder attaching nuts and re­
move master cylinder from vacuum power section.
POWER BRAKE AND MASTER CYLINDER
ASSEMBLY-REMOVE
1. Disconnect vacuum hose at vacuum check valve.
Plug hose and cover valve opening to exclude dust,
dirt, etc. (Fig. 5A-1, 5A-2, 5A-3).
2. Disconnect pipes from master cylinder hydrau­
lic ports and cover openings and pipe ends to exclude
dust, dirt, etc.
3. Remove retainer and clevis pin from brake
pedal inside car.