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2022 Titan Brake Fluid Flush After Pad Replacement - Spongy Pedal

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Mike T. · rep 0 · May 25, 1:56 AM · 1 replies · solved · Question

Vehicle: 2022 Nissan Titan SV 4x4

I recently changed the front and rear brake pads on my 2022 Nissan Titan SV, 4x4, which has about 40,000 miles on it. I followed all the steps, compressed the calipers, and everything seemed fine. However, now my brake pedal feels a bit spongy, and I have to push it down further than before to get the same stopping power.

I'm thinking I might have introduced air into the system when pushing the pistons back, or maybe it's just time for a brake fluid flush anyway. I haven't done one since I bought the truck new. What's the recommended interval for a brake fluid flush on these trucks, and what's the best way to bleed the brakes on a modern vehicle with ABS?

Any tips or tricks for getting a firm pedal back would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:56 AM

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ClearTheCode admin answer:

A spongy brake pedal after replacing pads on your 2022 Nissan Titan at 40,000 miles is a classic symptom of air in the hydraulic system. While pushing pistons back normally doesn't introduce air unless the master cylinder reservoir runs dry, it's a good opportunity to perform a brake fluid flush, which is likely overdue.

Here's a guide to address your issue:

  1. Brake Fluid Flush Interval: Nissan generally recommends a brake fluid flush every 2-3 years or 30,000-45,000 miles, whichever comes first. Brake fluid is hygroscopic, meaning it absorbs moisture over time, which lowers its boiling point and can lead to internal corrosion in the brake lines and ABS unit. Your truck is definitely due.
  2. Causes of Spongy Pedal:
    • Air in the System: The most common cause. Air is compressible, unlike brake fluid, leading to a soft, spongy pedal feel.
    • Old, Contaminated Fluid: While less likely to cause a sudden spongy pedal after a pad change, old fluid can contribute to overall poor braking performance.
    • Improper Bleeding: If any bleed valves were opened or the system was compromised during the pad change.
  3. Best Way to Bleed Brakes (DIY Steps):
    • Two-Person Method: This is the most common DIY method. One person pumps the pedal, the other opens and closes the bleed valve.
    • Bleeding Order: Start with the wheel furthest from the master cylinder and work your way closer. For your Titan, this is typically: Passenger Rear -> Driver Rear -> Passenger Front -> Driver Front.
    • Procedure:
      1. Ensure the master cylinder reservoir is full and keep it topped off throughout the process.
      2. Have an assistant slowly pump the brake pedal 3-5 times and hold it down.
      3. While the pedal is held, open the bleed valve on the caliper for a few seconds until fluid (and air bubbles) come out. Close the valve.
      4. Tell your assistant to release the pedal. Wait a few seconds.
      5. Repeat this process until no more air bubbles are seen coming out of the bleed valve for that wheel.
    • Gravity Bleed (Optional): Some people prefer gravity bleeding by just opening the bleed valves with the reservoir full and letting gravity do the work, but it's slower and less effective for removing stubborn air.
  4. When to See a Shop:
    • If a thorough manual bleed doesn't resolve the spongy pedal, it might indicate air trapped in the ABS module. This often requires a professional scan tool to cycle the ABS pump and bleed it properly (an 'ABS bleed' or 'service bleed').
    • If you suspect a leak in the system or a master cylinder issue, a shop can diagnose and repair it safely.
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