MAZDA MIATA 1991 Factory Service Manual

Fig. 18: View of Rear Drum Brake Assembly (Typical)
Courtesy of MAZDA MOTORS CORP.
Installation
1. Apply brake grease to brake shoe contact areas on backing plate. When installing adjuster between shoes,
insert a flat-tipped screwdriver between adjuster quadrant and meshing teeth on MX-6 and 626, or
between quadrant and knurled pin on Protege and 323. See Fig. 2
.
2. To fully retract adjuster, move quadrant until it touches backing plate. To complete installation, reverse
removal procedure. Adjust wheel bearings and stake lock nut.
Removal (Navajo)
1. Remove wheel assembly and drum. Place a wheel cylinder clamp over ends of wheel cylinder. Disengage
ad
justing lever from adjusting screw by pulling backwards on lever cable. See Fig. 19 .

1991 Mazda MX-5 Miata
BRAKE SYSTEM 1991 BRAKES Mazda Brake System
Microsoft
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Fig. 19: Examining Rear Brake Assemblies (Navajo)
Courtesy of FORD MOTOR CO.
2. Move outboard side of adjusting screw upward, and back off pivot nut as far as possible. Pull adjusting
lever, cable and adjusting spring down and toward rear to unhook pivot hook from large hole in
secondary shoe. DO NOT pry pivot hook from hole.
3. Remove adjusting spring and adjusting lever. Remove secondary shoe-to-anchor spring. Remove primary

1991 Mazda MX-5 Miata
BRAKE SYSTEM 1991 BRAKES Mazda Brake System
Microsoft
Sunday, July 05, 2009 2:18:08 PMPage 29 © 2005 Mitchell Repair Information Company, LLC.

shoe-to-anchor spring. Unhook cable anchor, and remove anchor pin plate.
4. Remove cable guide, shoe hold-down springs, brake shoes, adjusting screw, pivot nut and socket.
Remove parking brake link spring and link. Note color and position of springs for reassembly.
5. Disconnect parking brake cable from lever. Remove secondary shoe. Disassemble parking brake lever
from shoe by removing retaining clip and spring washer. See Fig. 20
.
Fig. 20: Exploded View of Rear Drum Brake Assembly (Navajo)

Courtesy of MAZDA MOTORS CORP.
Installation
Clean and sand brake shoe contact points on backing plate. Apply a light coating of lithium base grease to
contact points. Lubricate adjusting cable eye and anchor pin area. Lubricate adjusting screw, pivot and socket.
To install, reverse removal procedure.
PARKING BRAKE SHOES
Removal (929)

1991 Mazda MX-5 Miata
BRAKE SYSTEM 1991 BRAKES Mazda Brake System
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Raise and support vehicle. Remove rear wheels. Remove brake rotor. Remove upper and lower return springs.
See Fig. 21
. Remove hold-down springs and pins. Remove parking brake shoes. Separate adjuster and
operating lever. Minimum lining thickness is .04" (1 mm).
Fig. 21: Exploded View of Parking Brake Assembly (929)

Courtesy of MAZDA MOTORS CORP.
Installation
Connect operating lever to parking brake cable. Set marked side (with arrow) of operating lever to front side.
Position shoes and adjuster. Ensure threaded side of adjuster faces forward on left wheel and rearward on right
wheel. To complete installation, reverse removal procedure. Adjust parking brake. See PARKING BRAKE
under ADJUSTMENTS
at beginning of article.
REAR AXLE BEARING & OIL SEAL
Removal (B2200 & B2600i)
1. Remove wheel and brake drum. Disconnect parking brake cable and brake line. Remove backing plate
bolts. Remove backing plate and rear axle assembly. Remove axle bearing lock nut using Holder (49-
NOTE: For information on models with sealed wheel bearings, see appropriate article
in the SUSPENSION Section.

1991 Mazda MX-5 Miata
BRAKE SYSTEM 1991 BRAKES Mazda Brake System
Microsoft
Sunday, July 05, 2009 2:18:08 PMPage 31 © 2005 Mitchell Repair Information Company, LLC.

S120-645A) and Wrench (49-0603-635A).
2. Using Puller (49-S120-520A) and Adapter (49-S120-523A), remove rear axle bearings. Remove oil seal
from axle housing.
Installation
1. Install oil seal in axle housing. Install bearing inner race. Install and position oil seal flush with end of
axle casing. Apply multipurpose grease to oil seal lip. Install spacer with concave side facing backing
plate.
2. Press axle bearing onto axle shaft. Using wrench, install and tighten lock nut to 145-217 ft. lbs. (197-295
N.m). Install axle shaft assembly. Install backing plate. Reconnect brake line and parking brake cable.
Install brake drum and wheel. Bleed brake system.
MASTER CYLINDER
Removal
1. Disconnect fluid level sensor coupler (if equipped). Disconnect and plug hydraulic lines at master
cylinder to prevent entry of dirt and loss of fluid.
2. Remove nuts attaching master cylinder to firewall or power brake unit. Remove master cylinder from
vehicle. On RX7, remove proportioning valve by-pass bolt.
Installation
1. Place Adjustment Gauge (49-F043-001) onto master cylinder. Turn screw on adjuster gauge until it
contacts piston. Remove adjuster gauge. Apply 19.7 in. Hg to power brake unit.
2. Invert adjuster gauge and place it on power brake unit. Adjust push rod on power brake unit until there is
no clearance between push rod and adjuster gauge screw. Install master cylinder. Bleed hydraulic system.
POWER BRAKE UNIT
Removal & Installation
1. Remove master cylinder from power brake unit. See MASTER CYLINDER under REMOVAL &
INSTALLATION . Disconnect vacuum line at power brake unit. From inside vehicle, remove cotter pin
and clevis pin. Separate push rod from brake pedal.
2. Remove power brake unit-to-firewall nuts. Remove power brake unit. See Fig. 22
To install, reverse
removal procedure. Bleed hydraulic system. NOTE: Left wheel lock nut has left-hand threads.

1991 Mazda MX-5 Miata
BRAKE SYSTEM 1991 BRAKES Mazda Brake System
Microsoft
Sunday, July 05, 2009 2:18:08 PMPage 32 © 2005 Mitchell Repair Information Company, LLC.

Fig. 22: Removing Master Cylinder & Power Brake Unit (Typical)
Courtesy of MAZDA MOTORS CORP.
OVERHAUL

1991 Mazda MX-5 Miata
BRAKE SYSTEM 1991 BRAKES Mazda Brake System
Microsoft
Sunday, July 05, 2009 2:18:08 PMPage 33 © 2005 Mitchell Repair Information Company, LLC.

Fig. 23: Rear Caliper Assembly (Miata, Protege & 323)
Courtesy of MAZDA MOTORS CORP.

1991 Mazda MX-5 Miata
BRAKE SYSTEM 1991 BRAKES Mazda Brake System
Microsoft
Sunday, July 05, 2009 2:18:08 PMPage 34 © 2005 Mitchell Repair Information Company, LLC.

Fig. 24: Master Cylinder (Navajo).
Courtesy of MAZDA MOTORS CORP.

1991 Mazda MX-5 Miata
BRAKE SYSTEM 1991 BRAKES Mazda Brake System
Microsoft
Sunday, July 05, 2009 2:18:08 PMPage 35 © 2005 Mitchell Repair Information Company, LLC.

Fig. 25: Master Cylinder (929).
Courtesy of MAZDA MOTORS CORP.

1991 Mazda MX-5 Miata
BRAKE SYSTEM 1991 BRAKES Mazda Brake System
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Sunday, July 05, 2009 2:18:09 PMPage 36 © 2005 Mitchell Repair Information Company, LLC.

Fig. 26: Typical Master Cylinder (Except Navajo & 929)
Courtesy of MAZDA MOTORS CORP.
SPECIFICATIONS
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS
ApplicationFt. Lbs. (N.m)
Backing Plate (Rear)
B2200 & B2600i 2WD72-87 (98-118)
B2600i 4WD65-80 (88-108)
Navajo25-35 (34-47)
All Others33-43 (45-58)
Caliper Guide Bolt
B2200 & B2600i23-30 (31-41)

1991 Mazda MX-5 Miata
BRAKE SYSTEM 1991 BRAKES Mazda Brake System
Microsoft
Sunday, July 05, 2009 2:18:09 PMPage 37 © 2005 Mitchell Repair Information Company, LLC.