Question 1

How to service and repair the brake caliper on Toyota 4Runner?

Accepted Answer

The first step to serve or fix the brake caliper begins with wheel removal followed by disc fixation using hub nuts at 103 Nm torque. Use Special Service Tool: 09023-00100 to disconnect the brake line while wearing a brake fluid collection container because of a 15 Nm torque specification (155 kgf-cm, 11 ft. lbs). The removal of the caliper starts with unscrewing 2 mounting bolts torqued to 123 Nm (1,250 kgf-cm, 90 ft. lbs.) then continuing with clip removal together with 2 pins, anti-rattle spring and 2 pads and their corresponding 4 anti-squeal shims. The task requires a screwdriver to extract the 4 cylinder boot set rings and boots before constructing a wooden plate to support the pistons between them with a pad installed on one side while cleaning the pistons with compressed air starting from one end while avoiding finger placement in front of the pistons. A screwdriver will help extract the 4 piston seals which need to be removed from the cylinder. The pad lining thickness should be measured with a ruler to determine if it reaches the standard 11.5 mm (0.453 inch) or if it must be replaced due to a minimum requirement of 1.0 mm (0.039 inch); any pad showing sign of uneven wear needs immediate replacement. The measurement process involves a micrometer to check disc thickness against the standard 22.0mm (0.866inch) and minimum 20.0mm (0.787inch). Disc replacement must happen if the measurement reaches or falls under the minimum or reveals scoring and uneven wear. Start by measuring disc runout with a dial indicator at 10 mm (0.39 inch) from the edge to check if it remains below 0.07 mm (0.0028 inch); proceed to replace either the disc or conduct grinding on a "On-Car" brake lathe before front hub bearing play measurement. To achieve proper disc runout installation, users should start by unscrewing the hub nuts and removing the disc before reinstalling it with one-sixth turn adjustment from its previous position. Users should then retighten the hub nuts to 103 Nm (1,050 kgf-cm, 76 ft. lbs.) followed by repeat runout measurement until the disc reaches its best fit position with minimum runout lower than maximum values. Users should replace the disc in cases where the readings cannot achieve these conditions. Lithium soap base glycol grease gets applied first followed by a reverse installation process of disassembly. Bleeding of the brake system should follow fluid addition into the brake reservoir along with inspections for system leaks.

Question 2

How to service and repair a brake caliper on Toyota Tacoma?

Accepted Answer

Begin the brake caliper service and repair operations by taking it apart. Pry off the 4 cylinder boot set rings and boots by using a screwdriver. Organize a wooden plate that will support the pistons while aligning it between the components then attach a pad on one edge. Compressed air should be used to remove pistons from the cylinder while avoiding finger contact in front of the pistons. Remove the 4 piston seals from the cylinder by using a screwdriver as an instrument. During examination check the pad lining thickness, which must be 11.5 mm (0.453 inch) as base and must not fall below 1.0 mm (0.039 inch). The procedural measurement of disc thickness must fall within 22.0 mm (0.866 inch) standard or extend to a minimum of 20.0 mm (0.787 inch). A dial indicator set at a 10 mm (0.39 inch) distance from the outside edge allows runout assessment on a brake disc that remains tightened with its hub nuts. Maximum permissible runout should not exceed 0.07 mm (0.0028 inch). A "On-Car" brake lathe must be used to replace or grind outstanding discs until the front bearing play passes quality standards. Measurement can proceed afterward. To better the disc runout position remove the hub nuts while disc out then place the disc at a 1/6 turn position difference before re-torquing the hub nuts. Recheck the runout and record the precise disc installation position on the hub by rotating the disc 1/6 of turn through different installation positions until finding the optimal positioning with minimum runout value under the highest recorded runout threshold. The measurement process should be repeated using a new disc when the minimum runout reading surpasses the maximum specification. Lithium soap base glycol grease should be used for each indicated part during reassembly while performing the steps in the opposite order of disassembly.

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