Tl* the contact owns a 2013 gmc yukon. while driving various speeds, the brake warning indicator illuminated. the contact added brake fluid to the vehicle and the indicator illuminated again, but there was no fluid leaking from the vehicle. the contact was an independent mechanic who stated that the brake fluid was leaking into the vacuum canister for the power brake. the contact also mentioned that the failure could not be detected unless the vehicle was diagnosed. the dealer was not contacted. the contact repaired the vehicle himself. the manufacturer was not made aware of the failure. the failure mileage was 134,000.