1994 GMC Yukon I have checked the breaks and they are fine I have break fluid filled but my breaks keep going to the floor and the break light comes on as well
RepairPal Certified shops can diagnose and repair your 1994 GMC Yukon. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
IF no visible brake fluid leaks (?) Suspect failing 'master cylinder' .. Strongly suggest *brake* repair by qualified personnel, this is usually not for the average DIYer!!