Check brake operation by applying the brakes during a test drive. If the brakes do not operate properly, check the brake booster. Replace the brake booster assembly if it does not operate properly or if there are signs of leakage.
Piston Cup and Pressure Cup Inspection (B)
Check brake operation by depressing the brake pedal. Check for damage or signs of fluid leakage. Replace the master cylinder assembly if the pedal does not operate properly or if there is damage or signs of fluid leakage.
Check the difference in brake pedal travel between quick and slow braking. Replace the master cylinder if there is a difference in pedal travel.
Brake Hoses (C)
Check for damage or signs of fluid leakage. Replace the brake hose with a new one if it is damaged or leaking.
Caliper Piston Seal and Piston Boots (D)
Check brake operation by depressing the brake pedal. Check for damage or signs of fluid leakage. If the pedal does not operate properly, the brakes do not brake properly, or there is damage or signs of fluid leakage, disassemble and inspect the brake caliper. Replace the boots and seals with new ones whenever the brake caliper is disassembled.
Brake Bleeding
Make sure the brake fluid level in the reservoir is at the MAX (upper) mark.
Have an assistant slowly depress the brake pedal several times, then hold it down.
Loosen the bleeder screw on the right rear brake (A) to allow air to escape from the system. Then securely tighten the bleeder screw. [Front][General] [EPB]
Repeat the procedure for each wheel in the sequence shown below until no air bubbles appear in the fluid.
Fill the master cylinder reservoir to the MAX (upper) level mark.
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Test yourself
A quick Hyundai Sonata LF quiz: every answer comes with an explanation and a link to the manual page.
