THE GMC YUKON MODELS IN ALL TRIMS, HAVE FAULTY LED STRIPS THAT CAUSE THE BRAKE LIGHTS TO FAIL ON THE LEFT, AND RIGHT BRAKE LIGHT ASSEMBLY. THE FRUSTRATING PART IS IT WORKS INTERMITTENTLY, AND WHEN IT'S OFF A SLIGHT TAP WILL MOMENTARILY BRING IT BACK ON FOR THE DURATION OF THE JOLT. THIS LEADS ME TO BELIEVE THAT IT'S FAULTY CONNECTION INSIDE THE SEALS BRAKE LIGHT ASSEMBLY. THERE ARE THOUSANDS OF COMPLAINTS ONLINE ON OWNER FORUMS OF GMC YUKON'S . THIS IS KNOWN AS THE NEW YEAR MODELS 18-19 ARE NOT HAVING THE SAME ISSUE.