Hi All,
In my GMC truck 1500 Sierra, it makes an abnormal noise under the brake pedal area while pressing it. The sound comes directly from interior and its like a whistle sound and called sometime a hissing noise. The brake system functions properly and without any defects except the mentioned noise.
Is it possible from the brake booster? or could be from other sources?
Appreciate sharing your experience feedback in this problem.
Regards,
Abdulla
brake gmc.xspf