The numbers below refer to the step numbers on the diagnostic table:
Lubricant leaks from non-brake system components may come in contact with and contaminate brake system components.
Lubricant leaks from non-brake system components may come in contact with and contaminate brake system components.
Disc brake disc shields/backing plates that come in contact with disc brake discs may cause brake system noise.
Disc brake disc thickness variation that exceeds the maximum acceptable level can cause brake pulsation.
Disc brake disc thickness variation that exceeds the maximum acceptable level can cause brake pulsation.
Disc brake disc assembled lateral runout (LRO) that exceeds the maximum acceptable level can lead to thickness variation.
Step | Action | Yes | No | ||||||||
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DEFINITION: This diagnostic table is designed to diagnose ONLY the components of the DISC brake system in order to determine if the DISC brake system is operating correctly. You will be directed by the appropriate Symptom table to go to other brake system diagnostic tables as appropriate. | |||||||||||
1 | Were you sent here from a Brake Symptom table? | Go to Step 2 | |||||||||
2 | Visually inspect the brake pads for the following conditions: Refer to Brake Pad Inspection .
Did you find any conditions to indicate a concern with any of the front and/or rear brake pad? | Go to Step 3 | Go to Step 12 | ||||||||
3 | Are any of the front and/or rear brake pads contaminated? | Go to Step 8 | Go to Step 4 | ||||||||
4 | Are any of the front and/or rear brake pads worn unevenly? | Go to Step 7 | Go to Step 5 | ||||||||
5 | Are any of the front and/or rear brake pads and/or brake pad hardware loose or damaged? | Go to Step 7 | Go to Step 6 | ||||||||
6 |
Did you complete the inspection and replacement? | Go to Step 12 | -- | ||||||||
7 |
Notice: Support the brake caliper with heavy mechanic wire, or equivalent, whenever it is separated from its mount and the hydraulic flexible brake hose is still connected. Failure to support the caliper in this manner will cause the flexible brake hose to bear the weight of the caliper, which may cause damage to the brake hose and in turn may cause a brake fluid leak. Important: Do NOT disconnect the hydraulic brake flex hoses from the brake calipers.
Did you complete the inspection and replacement? | Go to Step 12 | -- | ||||||||
8 |
Did you find and correct the source of the leak causing contamination of the brake pads? | Go to Step 11 | Go to Step 9 | ||||||||
9 |
Did you find and correct the source of the leak causing contamination of the brake pads? | Go to Step 11 | Go to Step 10 | ||||||||
10 |
Notice: Support the brake caliper with heavy mechanic wire, or equivalent, whenever it is separated from its mount and the hydraulic flexible brake hose is still connected. Failure to support the caliper in this manner will cause the flexible brake hose to bear the weight of the caliper, which may cause damage to the brake hose and in turn may cause a brake fluid leak. Important: DO NOT disconnect the hydraulic brake flex hoses from the brake calipers.
Did you complete the cleaning, inspection and replacement? | Go to Step 11 | -- | ||||||||
11 | Visually inspect each of the rear disc brake disc shields/backing plates for evidence of contact with the brake discs. Are any of the brake disc shields/backing plates contacting the brake discs? | Go to Step 12 | Go to Step 13 | ||||||||
12 | Repair or replace the disc brake disc shields/backing plates as required. Refer to Rear Disc Brake Backing Plate Replacement . Did you complete the repair or replacement? | Go to Step 13 | -- | ||||||||
13 |
Important: Make the following determination AND ANSWER the question INDIVIDUALLY for EACH brake disc. Refer to Brake Rotor Thickness Measurement . Does the brake disc meet the minimum requirements for REFINISHING? | Go to Step 14 | Go to Step 17 | ||||||||
14 |
Important: Perform the following inspection AND ANSWER the question INDIVIDUALLY for EACH brake disc. Inspect each of the brake discs for thickness variation that exceeds the maximum acceptable level. Refer to Brake Rotor Thickness Variation Measurement . Does the brake disc exhibit thickness variation that exceeds the maximum acceptable level? | Go to Step 16 | Go to Step 15 | ||||||||
15 |
Refer to Brake Rotor Surface and Wear Inspection .
Important: Make the following determination AND ANSWER the question INDIVIDUALLY for EACH brake disc. If the brake disc exhibits any of the conditions listed previously, it requires refinishing. Does the brake disc require REFINISHING? | Go to Step 16 | Go to Step 21 | ||||||||
16 |
Were you able to REFINISH the brake disc within the minimum requirements? | Go to Step 21 | Go to Step 20 | ||||||||
17 | Is the brake disc at or below the DISCARD requirements? | Go to Step 20 | Go to Step 18 | ||||||||
18 |
Important: Perform the following inspection AND ANSWER the question INDIVIDUALLY for EACH brake disc. Inspect each of the brake discs for thickness variation that exceeds the maximum acceptable level. Refer to Brake Rotor Thickness Variation Measurement . Does the brake disc exhibit thickness variation that exceeds the maximum acceptable level? | Go to Step 20 | Go to Step 19 | ||||||||
19 |
Refer to Brake Rotor Surface and Wear Inspection .
Important: Make the following determination AND ANSWER the question INDIVIDUALLY for EACH brake disc. If the brake disc exhibits any of the conditions listed previously, it requires replacement. Does the brake disc require REPLACEMENT? | Go to Step 20 | Go to Step 21 | ||||||||
20 |
Important: Whenever a brake disc is replaced, the assembled lateral runout (LRO) of the brake disc must be measured to make sure optimum performance of the disc brakes. Replace the brake disc. Refer to Front Brake Rotor Replacement or Rear Brake Rotor Replacement . Did you complete the replacement? | Go to Step 23 | -- | ||||||||
21 |
Important: Perform the following inspection AND ANSWER the question INDIVIDUALLY for EACH brake disc. Inspect each of the brake discs for assembled lateral runout (LRO) that exceeds the maximum acceptable level. Refer to Brake Rotor Assembled Lateral Runout Measurement . Does the brake disc exhibit assembled LRO that exceeds the maximum acceptable level? | Go to Step 22 | Go to Step 23 | ||||||||
22 | Correct the LRO for each brake disc that was determined to have LRO exceeding the maximum acceptable level. Refer to Brake Rotor Assembled Lateral Runout Correction . Did you complete the operation? | Go to Step 23 | -- | ||||||||
23 | Install or connect components that were removed or disconnected during diagnosis. Did you complete the operation? | Disc Brake System OK Return to Symptom Table | -- |