BASE BRAKE SYSTEM
INDEX
page page
DESCRIPTION AND OPERATION
CHASSIS TUBES AND HOSES.............. 7
FRONT DISC BRAKE SYSTEM.............. 4
HUB/BEARING REAR WHEEL............... 9
MASTER CYLINDER...................... 7
PARKING BRAKE SYSTEM OPERATION....... 5
POWER BRAKE VACUUM BOOSTER
OPERATION........................... 8
PROPORTIONING VALVES................. 5
REAR DISC BRAKES...................... 5
REAR DRUM BRAKES..................... 5
RED BRAKE WARNING LAMP OPERATION..... 8
STOP LAMP SWITCH...................... 9
DIAGNOSIS AND TESTING
ADJUSTER REAR DRUM BRAKE
(AUTOMATIC)......................... 14
BRAKE FLUID CONTAMINATION............ 19
BRAKE ROTOR......................... 14
BRAKE SYSTEM BASIC DIAGNOSIS GUIDE.... 9
BRAKE SYSTEM DIAGNOSIS CHARTS....... 10
PROPORTIONING VALVES................ 16
RED BRAKE WARNING LAMP TEST......... 19
STOP LAMP SWITCH TEST PROCEDURE..... 19
TRACTION CONTROL LAMP TEST.......... 19
SERVICE PROCEDURES
BLEEDING BASE BRAKE
HYDRAULIC SYSTEM................... 20
BRAKE DRUM MACHINING................ 24
BRAKE TUBE REPAIR PROCEDURE......... 24
MASTER CYLINDER BLEEDING
PROCEDURE......................... 22
MASTER CYLINDER FLUID LEVEL CHECK.... 20
PARK BRAKE AUTO ADJUSTER
MECHANISM RELEASE................. 26
ROTOR MACHINING (FRONT/REAR)......... 22
REMOVAL AND INSTALLATION
BRAKE SUPPORT PLATE (REAR DRUM
BRAKES)............................ 37
FRONT DISC BRAKE CALIPER............. 27
FRONT DISC BRAKE PADS................ 30
FRONT PARK BRAKE CABLE.............. 65
HUB/BEARING.......................... 40
HYDRAULIC BRAKE TUBES AND HOSES..... 58
INTERMEDIATE PARK BRAKE CABLE....... 66
JUNCTION BLOCK....................... 55
LEFT REAR PARK BRAKE CABLE........... 67
MASTER CYLINDER..................... 44
PARK BRAKE PEDAL MECHANISM.......... 58PARK BRAKE SHOES (WITH REAR DISC
BRAKES)............................ 60
PROPORTIONING VALVE (W/ABS BRAKES) . . . 56
PROPORTIONING VALVE
(W/O ABS BRAKES).................... 57
REAR BRAKE DRUM..................... 33
REAR BRAKE WHEEL CYLINDER........... 39
REAR DISC BRAKE CALIPER.............. 28
REAR DISC BRAKE SHOES................ 31
REAR DRUM BRAKE SHOES............... 34
RIGHT REAR PARK BRAKE CABLE......... 66
STOP LAMP SWITCH..................... 69
VACUUM BOOSTER 2.4 LITER ENGINE...... 47
VACUUM BOOSTER 3.0 LITER ENGINE...... 49
VACUUM BOOSTER 3.3/3.8 LITER ENGINE.... 52
WHEEL AND TIRE INSTALLATION........... 27
DISASSEMBLY AND ASSEMBLY
FRONT DISC BRAKE CALIPER............. 71
MASTER CYLINDER BRAKE FLUID LEVEL
SWITCH............................. 71
MASTER CYLINDER FLUID RESERVOIR
FILL TUBE............................ 71
MASTER CYLINDER FLUID RESERVOIR...... 70
MASTER CYLINDER TO POWER BRAKE
BOOSTER VACUUM SEAL............... 69
WHEEL CYLINDER REAR DRUM BRAKE...... 76
CLEANING AND INSPECTION
BRAKE HOSE AND BRAKE LINES
INSPECTION.......................... 78
FRONT DISC BRAKE PAD LINING
INSPECTION.......................... 76
REAR DISC BRAKES..................... 76
REAR DRUM BRAKE SHOE LINING
INSPECTION.......................... 77
REAR DRUM BRAKE WHEEL CYLINDER...... 78
REAR WHEEL HUB AND BEARING
ASSEMBLY........................... 78
ADJUSTMENTS
PARK BRAKE CABLE ADJUSTMENT......... 81
PARK BRAKE SHOES (WITH REAR DISC
BRAKES)............................ 79
PROPORTIONING VALVE
(HEIGHT SENSING).................... 81
REAR DRUM BRAKE SHOE ADJUSTMENT.... 79
STOP LAMP SWITCH..................... 78
SPECIFICATIONS
BRAKE ACTUATION SYSTEM.............. 83
BRAKE FASTENER TORQUE
SPECIFICATIONS...................... 83
NSBRAKES 5 - 3
REFACING BRAKE ROTOR
Refacing of the rotor is not required each time the
brake pads are replaced.
When refacing a rotor the required 0.08 mm (0.003inch) TIR (Total Indicator Reading) and 0.013 mm
(0.0005 inch) thickness variation limits MUST BE
MAINTAINED.Extreme carein the operation of
rotor turning equipment is required.
The use of a double straddle cutter (Fig. 32) that
machines both sides of the rotor at the same time is
highly recommended.
RESURFACNG BRAKE ROTOR
This operation can be used when rotor surface is
rusty, has lining deposits or excessive lateral runout
or thickness variation is evident.
A sanding rotor attachment (Fig. 33) will remove
surface contamination without removing much rotor
material.
It will generally follow variations in thickness that
are in the rotor.
Fig. 32 Refacing Brake Rotor
Fig. 33 Resurfacing Brake Rotor (Final Finish)
Fig. 34 Front Rotor Thickness Markings
Fig. 35 Rear Rotor Thickness Markings
NSBRAKES 5 - 23
SERVICE PROCEDURES (Continued)
(9) Road test the vehicle and make several stops to
wear off any foreign material on the brakes and to
seat the brake shoe linings.
FRONT DISC BRAKE PADS
REMOVE
WARNING: ALTHOUGH FACTORY INSTALLED
BRAKE LININGS ARE MADE FROM ASBESTOS
FREE MATERIALS, SOME AFTERMARKET BRAKE
LININGS MAY CONTAIN ASBESTOS. THIS SHOULD
BE TAKEN INTO ACCOUNT WHEN SERVICING A
VEHICLE'S BRAKE SYSTEM, WHEN AFTERMARKET
BRAKE LININGS MAY HAVE BEEN INSTALLED ON
THE VEHICLE. ALWAYS WEAR A RESPIRATOR
WHEN CLEANING BRAKE COMPONENTS AS
ASBESTOS CAN CAUSE SERIOUS BODILY HARM
SUCH AS ASBESTOSIS AND OR CANCER. NEVER
CLEAN BRAKE COMPONENTS BY USING COM-
PRESSED AIR, USE ONLY A VACUUM CLEANER
SPECIFICALLY DESIGNED FOR THE REMOVAL OF
BRAKE DUST. IF A VACUUM CLEANER IS NOT
AVAILABLE, CLEAN BRAKE PARTS USING ONLY
WATER±DAMPENED SHOP TOWELS. DO NOT CRE-
ATE BRAKELINING DUST BY SANDING BRAKE LIN-
INGS WHEN SERVICING A VEHICLE. DISPOSE OF
ALL DUST AND DIRT SUSPECTED OF CONTAINING
ASBESTOS FIBERS USING ONLY SEALED AIR-
TIGHT BAGS OR CONTAINERS. FOLLOW ALL REC-
OMMENDED SAFETY PRACTICES PRESCRIBED BY
THE OCCUPATIONAL SAFETY AND HEALTH ADMIN-
ISTRATION (OSHA) AND THE ENVIRONMENTAL
PROTECTION AGENCY (EPA), FOR HANDLING AND
DISPOSAL OF PRODUCTS CONTAINING ASBES-
TOS.
CAUTION: During service procedures, grease or
any other foreign material must be kept off brake
shoe assemblies, and braking surfaces of brake
drum and external surfaces of hub/bearing assem-
bly.
(1) Remove outboard brake pad, by prying the pad
retaining clip over raised area on caliper (Fig. 50).
Then slide the pad down and off the caliper.
(2) Pull inboard brake pad away from piston, until
retaining clip on brake pad is free from cavity in cal-
iper piston (Fig. 51).
INSTALL
(1) Completely retract caliper piston back into pis-
ton bore of caliper assembly. This is required for cal-
iper installation with new brake pad assemblies.
(2) Remove the protective paper from the noise
suppression gasket on both the inner and outer brake
pad assemblies (if equipped).
NOTE: The inboard and outboard brake pads are
not common, refer to (Fig. 52) for inboard and out-
board brake pad assembly identification.
(3) Install the new inboard brake pad assembly
into the caliper piston by firmly pressing into piston
bore (Fig. 53). Be sure inboard brake pad assembly is
positioned squarely against face of caliper piston.
(4) Slide the new outboard brake pad assembly
onto the caliper assembly (Fig. 54).
Fig. 50 Removing Outboard Brake Pad From Caliper
Fig. 51 Removing Inboard Brake Pad From Piston
5 - 30 BRAKESNS
REMOVAL AND INSTALLATION (Continued)
(12) Inspect caliper piston for pitting, scratches, or
any physical damage. Replace piston if there is evi-
dence of scratches, pitting or physical damage.
CALIPER ASSEMBLY
CAUTION: Excessive vise pressure will cause bore
distortion and binding of piston.
(1) Clamp caliper in a vise (with protective caps
installed on jaws of vise).
(2) Dip new piston seal in clean brake fluid and
install in the groove of the caliper bore. Seal should
be positioned at one area in groove and gently
worked around the groove (Fig. 190), using only your
fingers until properly seated.NEVER USE AN OLD
PISTON SEAL.Be sure that fingers are clean and
seal is not twisted or rolled (Fig. 190).
(3) Coat new piston boot with clean brake fluid
leaving a generous amount inside boot.
(4) Position dust boot over piston after coating
with brake fluid.
CAUTION: Force must be applied to the piston uni-
formly to avoid cocking and binding of the piston in
the bore of the caliper.
(5) Install piston into caliper bore pushing it past
the piston seal until it bottoms in the caliper bore
(Fig. 191).
(6) Position dust boot into the counterbore of the
caliper assembly piston bore.
(7) Using a hammer and Installer Piston Caliper
Boot, Special Tool C-4689 and Handle, Special ToolC-4171, drive boot into counterbore of the caliper
(Fig. 192).
(8) Install guide pin sleeves and bushings. See
Install Guide Pin Bushings section in the caliper dis-
assembly section of this manual.
(9) Install brake pads. See Installing Brake Pads
in the Brake Pad Service Procedures section of this
manual.
(10) Before installing caliper assembly on vehicle,
inspect brake rotor. If any conditions as described in
Checking Brake Rotor for Runout and Thickness are
present the rotor, must be replaced or refaced. If the
rotor does not require any servicing, install caliper
assembly.
(11) Install brake hose onto caliper using banjo
bolt. Torque the brake hose to caliper assembly banjo
bolt to 33 N´m (24 ft. lbs.).New seal washers
Fig. 189 Honing Brake Caliper Piston Bore
Fig. 190 Installing New Piston Seal In Caliper
Fig. 191 Installing Piston Into Caliper Bore
NSBRAKES 5 - 75
DISASSEMBLY AND ASSEMBLY (Continued)