Mazda B-Series 1998-06

Brake Shoes

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Adjustment





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Fig. Brake shoe adjustment gauge- Step 1



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Fig. Brake shoe adjustment gauge- Step 2



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Fig. Adjusting the rear brakes



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Fig. Adjust the rear brakes with a flat bladed tool inserted in the access hole in the backing plate

The drum brakes are self-adjusting and require a manual adjustment only after the brake shoes have been replaced.

Disc brakes are not adjustable.

To adjust the rear brakes with drums installed, follow the procedure given below:

  1. Raise the vehicle and support it with safety stands.
  2.  
  3. Remove the rubber plug from the adjusting slot on the backing plate.
  4.  
  5. Turn the adjusting screw using a Brake Shoe Adjustment Tool or equivalent inside the hole to expand the brake shoes until they drag against the brake drum and lock the drum.
  6.  
  7. Insert a small screwdriver or piece of firm wire (coat hanger wire) into the adjusting slot and push the automatic adjusting lever out and free of the starwheel on the adjusting screw and hold it there.
  8.  
  9. Engage the topmost tooth possible on the starwheel with the brake adjusting spoon. Move the end of the adjusting spoon upward to move the adjusting screw starwheel downward and contract the adjusting screw. Back off the adjusting screw starwheel until the wheel spins FREELY with a minimum of drag about 10 to 12 notches. Keep track of the number of turns that the starwheel is backed off, or the number of strokes taken with the brake adjusting spoon.
  10.  
  11. Repeat this operation for the other side. When backing off the brakes on the other side, the starwheel adjuster must be backed off the same number of turns to prevent side-to-side brake pull.
  12.  
  13. When all drum brakes are adjusted, remove the safety stands and lower the vehicle and make several stops while backing the vehicle, to equalize the brakes at all of the wheels.
  14.  
  15. Road test the vehicle. PERFORM THE ROAD TEST ONLY WHEN THE BRAKES WILL APPLY AND THE VEHICLE CAN BE STOPPED SAFELY!
  16.  

Removal & Installation





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Fig. Rear Drum Components



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Fig. Component locations on the left side 10 in. brake assembly



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Fig. Component locations on the right side 10 in. brake assembly


CAUTION
Older brake pads or shoes may contain asbestos, which has been determined to be a cancer causing agent. Never clean the brake surfaces with compressed air! Avoid inhaling any dust from any brake surface! When cleaning brake surfaces, use a commercially available brake cleaning fluid.

  1. Raise and support the vehicle and remove the wheel and brake drum from the wheel to be worked on.
  2.  

If you have never replaced the brakes on a car before and you are not too familiar with the procedures involved, only disassemble and assemble one side at a time, leaving the other side intact as a reference during reassembly.

  1. Install a clamp over the ends of the wheel cylinder to prevent the pistons of the wheel cylinder from coming out, causing loss of fluid.
  2.  
  3. Contract the brake shoes by pulling the self-adjusting lever away from the starwheel adjustment screw and turn the starwheel up and back until the pivot nut is drawn onto the starwheel as far as it will come.
  4.  



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Fig. Clean the brake shoe assemblies with a liquid cleaning solution, NEVER with compressed air



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Fig. To begin remove the brake shoes, pull the adjuster cable towards the shoe ...



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Fig. ... and disconnect the pivot hook from the adjusting lever. Wind the starwheel all the way in

  1. Pull the adjusting lever, cable and automatic adjuster spring down and toward the rear to unhook the pivot hook from the large hole in the secondary shoe web. Do not attempt to pry the pivot hook from the hole.
  2.  
  3. Remove the automatic adjuster spring and the adjusting lever.
  4.  
  5. Remove the primary shoe-to-anchor spring with a brake tool. (Brake tools are very common and are available at auto parts stores). Remove the secondary shoe-to-anchor spring and unhook the cable anchor. Remove the anchor pin plate.
  6.  



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Fig. Disconnect the adjuster lever return spring from the lever ...



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Fig. ... and remove the spring and the lever



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Fig. Next, using a brake spring removal tool ...



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Fig. ... disconnect the primary brake shoe return spring from the anchor pin



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Fig. Repeat the procedure and remove the secondary return spring, adjuster cable and its guide



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Fig. Also remove the anchor pin plate

  1. Remove the cable guide from the secondary shoe.
  2.  
  3. Remove the shoe hold-down springs, shoes, adjusting screw, pivot nut, and socket. Note the color of each hold-down spring for assembly. To remove the hold-down springs, reach behind the brake backing plate and place one finger on the end of one of the brake hold-down spring mounting pins. Using a pair of pliers, grasp the washer-type retainer on top of the hold-down spring that corresponds to the pin that you are holding. Push down on the pliers and turn them 90° to align the slot in the washer with the head on the spring mounting pin. Remove the spring and washer retainer and repeat this operation on the hold-down spring on the other shoe.
  4.  
  5. Remove the parking brake link and spring. Disconnect the parking brake cable from the parking brake lever.
  6.  
  7. After removing the rear brake secondary shoe, disassemble the parking brake lever from the shoe by removing the retaining clip and spring washer.
  8.  



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Fig. Pull the bottoms of the shoes apart and remove the adjuster screw assembly



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Fig. Press in the hold-down springs while holding in on the nail from behind, then turn the cup 90- ...



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Fig. ... and release to remove the hold-down spring. Pull the nail out from the backing plate



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Fig. Remove the primary (front) brake shoe from the backing plate ...



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Fig. ... and the parking brake strut as well



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Fig. Remove the secondary shoe hold-down, pull the shoe out then press up on the cable spring ...



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Fig. ... and disconnect the parking brake cable from its lever by pulling it from the slot

To assemble and install the brake shoes:



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Fig. Lightly apply the proper grade of lubricant to the points shown on the backing plate

  1. Assemble the parking brake lever to the secondary shoe and secure it with the spring washer and retaining clip.
  2.  
  3. Apply a light coating of Lubriplate® at the points where the brake shoes contact the backing plate.
  4.  
  5. Position the brake shoes on the backing plate, and install the hold-down spring pins, springs, and spring washer-type retainers. Install the parking brake link, spring and washer. Connect the parking brake cable to the parking brake lever.
  6.  
  7. Install the anchor pin plate, and place the cable anchor over the anchor pin with the crimped side toward the backing plate.
  8.  
  9. Install the primary shoe-to-anchor spring with the brake tool.
  10.  
  11. Install the cable guide on the secondary shoe web with the flanged holes fitted into the hole in the secondary shoe web. Thread the cable around the cable guide groove.
  12.  
  13. Install the secondary shoe-to-anchor (long) spring. Be sure that the cable end is not cocked or binding on the anchor pin when installed. All of the parts should be flat on the anchor pin. Remove the wheel cylinder piston clamp.
  14.  
  15. Apply Lubriplate® to the threads and the socket end of the adjusting starwheel screw. Turn the adjusting screw into the adjusting pivot nut to the limit of the threads and then back off 1 / 2 turn.
  16.  

Interchanging the brake shoe adjusting screw assemblies from one side of the vehicle to the other would cause the brake shoes to retract rather than expand each time the automatic adjusting mechanism operated. To prevent this, the socket end of the adjusting screw is stamped with an R or an L for RIGHT or LEFT. The adjusting pivot nuts can be distinguished by the number of lines machined around the body of the nut; one line indicates left hand nut and 2 lines indicates a right hand nut.

  1. Place the adjusting socket on the screw and install this assembly between the shoe ends with the adjusting screw nearest to the secondary shoe.
  2.  
  3. Place the cable hook into the hole in the adjusting lever from the backing plate side. The adjusting levers are stamped with an R (right) or an L (left) to indicate their installation on the right or left hand brake assembly.
  4.  
  5. Position the hooked end of the adjuster spring in the primary shoe web and connect the loop end of the spring to the adjuster lever hole.
  6.  
  7. Pull the adjuster lever, cable and automatic adjuster spring down toward the rear to engage the pivot hook in the large hole in the secondary shoe web.
  8.  
  9. After installation, check the action of the adjuster by pulling the section of the cable between the cable guide and the adjusting lever toward the secondary shoe web far enough to lift the lever past a tooth on the adjusting screw starwheel. The lever should snap into position behind the next tooth, and release of the cable should cause the adjuster spring to return the lever to its original position. This return action of the lever will turn the adjusting screw starwheel one tooth. The lever should contact the adjusting screw starwheel one tooth above the center line of the adjusting screw.
  10.  



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Fig. Exploded view of a typical brake adjuster assembly



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Fig. The return spring and adjuster correctly installed



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Fig. Correct adjuster cable routing, driver's side shown



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Fig. View of the rear drum brake shoes completely assembled to the backing plate

If the automatic adjusting mechanism does not perform properly, check the following:

  1. Check the cable end fittings. The cable ends should fill or extend slightly beyond the crimped section of the fittings. If this is not the case, replace the cable.
  2.  
  3. Check the cable guide for damage. The cable groove should be parallel to the shoe web, and the body of the guide should lie flat against the web. Replace the cable guide if this is not so.
  4.  
  5. Check the pivot hook on the lever. The hook surfaces should be square with the body on the lever for proper pivoting. Repair or replace the hook as necessary.
  6.  
  7. Make sure that the adjusting screw starwheel is properly seated in the notch in the shoe web.
  8.  

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Raise and safely support the vehicle. Remove the wheel and tire assembly and the brake drum.
  4.  
  5. Pull backward on the adjusting lever cable to disengage the adjusting lever from the adjusting screw. Move the outboard side of the adjusting screw upward and back off the pivot nut as far as it will go.
  6.  
  7. Pull the adjusting lever, cable and automatic adjuster spring down and toward the rear to unhook the pivot hook from the large hole in the secondary shoe web. Do not pry the pivot hook from the hole.
  8.  
  9. Remove the automatic adjuster spring and adjusting lever.
  10.  
  11. Remove the secondary shoe-to-anchor spring using a suitable brake spring removal/installation tool. Using the tool, remove the primary shoe-to-anchor spring and unhook the cable anchor. Remove the anchor pin plate, if equipped.
  12.  
  13. Remove the cable guide from the secondary shoe.

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    Fig. Rear brake assembly and related components

  14.  
  15. Remove the shoe hold-down springs, shoes, adjusting screw, pivot nut and socket. Note the color and position of each hold-down spring so they can be reassembled in the same position.
  16.  
  17. Remove the parking brake link and spring. Disconnect the parking brake cable from the parking brake lever.
  18.  
  19. Remove the secondary brake shoe. On 9 in. (22.8cm) rear brakes, remove the parking brake lever from the shoe. On 10 in. (25.4cm) rear brakes, remove the retainer clip and spring washer and remove the parking brake lever.
  20.  

To install:

  1. Clean the backing plate ledge pads and sand lightly. Apply a light coating of high temperature lithium grease to the points where the brake shoes touch the backing plate. Lubricate the adjusting cable eye and the anchor pin area.
  2.  
  3. Install the parking brake lever on the secondary shoe. On 10 in. (25.4cm) brakes, secure with the spring washer and retaining clip.
  4.  
  5. Position the brake shoes on the backing plate and install the hold-down spring pins, springs and cups. Install the parking brake link, spring and washer. Connect the parking brake cable to the parking brake lever.
  6.  
  7. Install the anchor pin plate, if equipped, and place the cable anchor over the anchor pin with the crimped side toward the backing plate.
  8.  
  9. Install the primary shoe-to-anchor spring using the brake spring removal/installation tool.
  10.  
  11. Install the cable guide on the secondary shoe with the flanged hole fitted into the hole in the secondary shoe. Thread the cable around the cable guide groove.
    NOTE
    Make sure the cable is positioned in the groove and not between the guide and shoe web.

  12.  
  13. Install the secondary shoe-to-anchor (long) spring.
    NOTE
    Make sure the cable end is not cocked or binding on the anchor pin when installed. All parts should be flat on the anchor pin.

  14.  
  15. Apply high temperature lithium grease to the threads and the socket end of the adjusting screw. Turn the adjusting screw into the adjusting pivot nut to the end of the threads and then loosen, 1 / 2 turn.
  16.  
  17. Place the adjusting socket on the screw and install the assembly between the shoe ends with the adjusting screw nearest the secondary shoe.
    NOTE
    Be sure to install the adjusting screw on the same side of the vehicle from which it was removed. To prevent incorrect installation, the socket end of each adjusting screw is stamped with R or L , to indicate installation on the right or left side of the vehicle. The adjusting pivot nuts have lines machined around the body of the nut, 2 lines indicating the right side nut and 1 line indicating the left side nut.

  18.  
  19. Hook the cable hook into the hole in the adjusting lever from the outboard plate side. The adjusting levers are also stamped with an R or L to indicate right or left side installation.
  20.  
  21. Place the hooked end of the adjuster spring in the large hole in the primary shoe web and connect the loop end of the spring to the adjuster lever hole.
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  23. Pull the adjuster lever, cable and automatic adjuster spring down toward the rear to engage the pivot hook in the large hole in the secondary shoe web.
  24.  
  25. After installation, check the action of the adjuster by pulling the section of the cable between the cable guide and the adjusting lever toward the secondary shoe web far enough to lift the lever past a tooth on the adjusting screw wheel. The lever should snap into position behind the next tooth and releasing the cable should cause the adjuster spring to return the lever to its original position. This return action will turn the adjusting screw 1 tooth.
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  27. If pulling the cable does not produce the action described previously, or if lever action is sluggish instead of positive and sharp, check the position of the lever on the adjusting screw toothed wheel. With the brake in a vertical position, anchor at the top, the lever should contact the adjusting wheel 1 tooth above the centerline of the adjusting screw. If the contact point is below the centerline, the lever will not lock on the adjusting screw wheel teeth and the screw will not turn, since the lever is actuated by the cable.
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  29. Adjust the brake shoes using either a brake adjustment gauge or manually with the drums installed.
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  31. Install the wheels, and lower the vehicle.
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  33. Check and adjust the brake fluid level, as required.
  34.  

 
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