How To Diagnose a Spongy or Soft Brake Pedal

How To Diagnose a Spongy or Soft Brake Pedal
Does your brake pedal feel a little bit soft or spongy?
Here are some common causes for a soft or spongy brake pedal.
Common Causes of a Spongy or Soft Pedal:
- Brake fluid leaks
- Worn out brake hoses
- Air in the system
- Contaminated brake fluid
Brake Fluid Leaks:
- Worn, damaged or rusted components in the brake system can cause fluid leaks
- Checking the fluid level in the reservoir because a leak can be easily identified
- Inspect each caliper, brake hoses and brake lines to the master cylinder for leaks
Worn Out Brake Hoses:
- Swelling is an indication that a hose is worn out when there is swelling
- Have someone press the brake pedal while you inspect the hoses for leaks or swelling
- Any amount of swelling indicates a bad brake hose
Air in the Brake System:
- If it is not properly bled after replacing a component, air can become trapped in a system
- Air can be introduced to the system by overheating the caliper, causing the brake fluid to boil
- If rapidly pumping a soft pedal restores pedal pressure, there is most likely air in the system
Brake Fluid Contamination
- Rust or debris in the system will contaminate fluid
- Always change fluid at the recommended intervals
- Flush the system at least every two years
These tips can point you in the right direction if there are common issues with your vehicle:
- Check for any recalls or TSB’s related to the symptoms or vehicle system of concern
- Look up common complaints on the National Highway Traffic Safety Administration’s website
The brake system should be bled if:
- Opened hydraulic system
- Flushed brake fluid
- Air is present in the system
- Replaced a brake component
Not all vehicles have the same bleeding procedure. You should always refer your Factory Service Manual for the proper procedure.
- Many newer vehicles require a scan tool to bleed the ABS unit. A soft or spongy pedal may remain, if this is not completed
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