The Car Care Clinic with the Dr John

88 Lincoln Mark VII - Parking brake problems

Frederick in Farnborough, Hants

Question

Doctor, I own a 1988 Lincoln Mark VII and my “ automatic parking brake release ” is not automatically releasing (like to use it) – I have to reach under the dash and use the manual release. I also noticed my cruise control is not functioning either. I understand (from the owners manual) that these are both vacuum operated. My question is: Do you think these two problems are related, and is there anything I can do to remedy it?

Answer

Well Frederick It is true that both components do require engine vacuum to operate. Due to the age of your vehicle it is very likely that the vacuum hoses in the engine compartment are hard and most likely cracked. This would cause a loss of vacuum supply to these components. Even though your vehicle is not known for great gas (petrol) mileage, fixing a vacuum leak that is effecting the cruise control and emergency brake release will make the engine run better and improve mileage

Good Luck!
Dr. John