Spongy Hummer EV Brakes May Signal Fluid Issues

I encountered similar brake pedal issues with my 2019 GMC Sierra EV. A spongy brake pedal often indicates air in the brake system or low brake fluid levels. Last month at the garage, my vehicle needed a complete brake system inspection. The master cylinder was leaking, causing the brake fluid to drop gradually. This is a serious safety concern that requires immediate attention. The repair involved bleeding the brake system to remove air bubbles and replacing the faulty master cylinder. While EVs have regenerative braking, the traditional hydraulic brake system still requires regular maintenance. The symptoms you describe match a potentially compromised brake system, which should not be ignored even without a warning light. Checking brake fluid levels is straightforward, but given the complexity of EV brake systems with their regenerative components, professional diagnosis would be more prudent. The master cylinder and brake fluid condition need proper evaluation to ensure safe operation. From my experience, these symptoms worsened quickly, so prompt professional inspection is recommended rather than waiting for the brake warning light to activate.

Thanks for sharing your experience. I had the exact same spongy pedal issue on my Hummer EV last winter. The mechanic found air bubbles in the hydraulic brakes and needed to do a full brake system flush. The warning light came on a few days after I first noticed the spongy feeling, and the brake pedal got worse pretty quickly after that. Would you mind sharing what the repair ended up costing you? My brake inspection and fluid replacement came to 380 Euro, but prices seem to vary quite a bit. Have you noticed any other brake-related issues since getting it fixed? My brakes have been working perfectly after the service, but I now check the brake fluid level monthly just to be safe.

Since getting my Sierra EV checked by the mechanic, the brake fluid level issue was completely resolved. The repair bill came to 480 Euro, which included a thorough brake inspection, bleeding the system, and replacing the worn brakes along with the master cylinder. The hydraulic brakes have performed flawlessly for the past three months. The brake pedal feels firm and responsive now, exactly how it should be. Monthly brake fluid checks are a smart preventive measure, I have also made this a regular part of my maintenance routine after my experience. Regular brake system monitoring helps catch potential issues before they become serious problems. Having experienced both the spongy pedal and subsequent repair, I can confirm that prompt professional attention is worth every cent for maintaining safe and reliable braking performance.

Your brake system issues sound exactly like what I dealt with. I took my Hummer to the mechanic last week after reading the responses here. The master cylinder had a slow leak, causing air to enter the brake system. They did a complete brake fluid flush and replaced some worn components. The total cost came to 425 Euro for the inspection, new master cylinder, and labor. While it wasnt cheap, the brake pedal now feels solid again with no sponginess. The mechanic mentioned these EV brake systems need regular maintenance despite having regenerative braking. The warning light finally came on during my drive to the shop, which confirmed my suspicions about the brake fluid level being low. Im glad I didnt wait any longer, the mechanic said the brake system could have failed completely if left unchecked. Now I do monthly brake fluid checks as preventive maintenance. No more brake issues since the repair, and I feel much safer knowing the problem is fixed properly.