Spongy Brake Pedal Signals Potential Safety Risk

Had a similar issue with my 2005 Buick LeSabre. The spongy brake pedal and inconsistent pedal height are classic symptoms of air in the hydraulic brake system or low brake fluid levels. In my case, the master cylinder was leaking brake fluid, allowing air to enter the hydraulic brake system. The repair required a full brake fluid flush, replacement of the master cylinder, and bleeding of all brake calipers. This was a serious safety concern that needed immediate attention. The disc brakes and brake rotors were actually fine, but the compromised hydraulic system made the pedal feel unreliable. If left unaddressed, this could have led to complete brake failure. These symptoms often indicate: Air in brake lines, Low brake fluid level, Failing master cylinder, Leaking brake calipers, Worn brake hoses Would strongly suggest having the brake system inspected professionally. When hydraulic brakes show these symptoms, its typically not something that will resolve on its own and usually indicates an underlying issue that needs repair.

Thanks for sharing that experience. I had nearly identical symptoms with my Park Avenue last year, that spongy brake pedal feeling is pretty scary. The master cylinder ended up being the culprit for me too, and the brake system needed a complete flush. Just curious, do you remember roughly what you paid for the full repair? Also wondering if youve had any squeaky brakes or other brake-related issues pop up since getting it fixed? My repair has held up well so far but always good to know what to watch out for.

Thanks for asking about the repair costs. The master cylinder and brake system service came to 240€ total, which covered fixing the hydraulics and a complete brake fluid flush. The main concern turned out to be an undervoltage issue affecting the brake system function. Since the repair, the brake pedal feels firm and responsive, no more sponginess or inconsistent behavior. The disc brakes and brake rotors are working perfectly now. Have not experienced any squeaking or other brake-related problems in the months following the fix. Its important to maintain proper brake fluid levels and watch for any changes in pedal feel. Regular brake system inspections can catch potential issues before they become serious safety concerns. The original symptoms you described, spongy pedal and inconsistent engagement, are definitely warning signs that shouldnt be ignored.

Thanks everyone for the input. Finally got my car checked out at a local shop. The mechanic found the master cylinder was indeed failing and needed replacement, along with a full brake fluid flush. Total bill came to around 300 Euro for parts and labor. The brake pedal feels solid now, no more of that scary spongy feeling when pressing down. The hydraulic brake system is working like new again. Had them check the brake pads while they were at it, and those still had plenty of life left. The shop did a great job explaining everything and even showed me the old master cylinder to point out where it was leaking. Much better experience than my last mechanic. Been driving for about two weeks since the repair with no issues, no squeaky brakes or other problems. Definitely glad I got it fixed before it turned into something more serious.