VW Amarok Brake Pedal Issues: Spongy and Vibrating

I had a similar issue with my 2015 Volkswagen Transporter diesel about 6 months ago. Having moderate experience with brake systems, I initially thought it was related to worn brake pads or disc brakes, but it turned out to be more complex. The symptoms were nearly identical, spongy brake pedal and inconsistent braking performance. After taking it to my regular workshop, they diagnosed an undervoltage problem affecting the brake system electronics. The issue was causing irregular pressure distribution in the brake calipers. The total repair cost was 240€, which included: Electronic system diagnosis, Brake system pressure check, Voltage regulator replacement, Brake fluid system bleeding Before jumping to conclusions about your Amarok, could you provide: Any warning lights on the dashboard? Does the issue occur more when the engine is cold or warm? Have you noticed any electrical issues with other systems? While your brake pads might be due for replacement at 50000km, the symptoms suggest this could be more than just worn metal brakes. A proper diagnostic check would be advisable, especially since brake shoes and calipers can be affected by electrical system issues.

Had my rig serviced last month at 148567km and I agree this could be a voltage-related issue. Also noticed similar symptoms with my Amarok's brake system before getting it fixed. The hydraulic brakes would behave unpredictably, making the pedal feel inconsistent. No warning lights appeared, but the brake pedal response definitely worsened when the engine was warm. After diagnosis, it turned out that air had entered the brake fluid lines causing the spongy feeling. The workshop performed a complete brake fluid flush and system bleed which resolved the issue. Total repair came to 180€ including: Brake system diagnosis, Complete brake fluid replacement, Full system bleeding, Brake line inspection The disc brakes and pads checked out fine, so no replacement needed there.

Thanks for sharing your experience with the brake fluid system issue. My Transporter had similar symptoms, though I initially focused too much on the electronic components. Learning that your Amarok's problem was resolved with a brake fluid flush makes me think I should have had that checked first before replacing the voltage regulator. Air in the hydraulic brakes is a common cause of spongy pedal feel. When brake fluid absorbs moisture over time, it can create air pockets, affecting the brake calipers operation. The brake rotors and pads can be in perfect condition, but air in the lines will still cause inconsistent pedal feedback. Your repair cost of 180€ seems reasonable for a full system flush. Honestly wish I had gone this route first instead of immediately suspecting electrical issues. My 240€ repair might have been unnecessary, though the voltage regulator was showing signs of wear anyway. Good to know your squeaky brakes turned out to be a simpler fix. For others reading this thread, it highlights the importance of regular brake fluid maintenance, even when brake pads and rotors are still in good condition.

Taking the position of (who asked the initial question): Good points about brake fluid maintenance. It was a relief the problem wasnt with the disc brakes or electrical system. Regular fluid changes are definitely worth it considering how critical hydraulic brakes are for safety. Since the repair my brake pedal feels solid again with consistent pressure. The workshop also mentioned checking brake fluid should be part of regular maintenance, not just when problems occur. The brake rotors and other components were all within spec, so the 180€ spent on the fluid system service was money well spent. For anyone else experiencing similar symptoms, get the brake fluid checked first before assuming more expensive repairs are needed. Air in the system can really affect how brake shoes and calipers perform, even when all the metal brakes components are fine. Thanks for sharing your Transporter experience. While the root cause was different, the symptoms were very similar. This shows why proper diagnosis is important rather than just replacing parts.