Buy Now | Log In | ALLDATA Corporate Site |
Back To Home Page
Log In To Your Subscription
Go To ALLDATA Back Home
Buy A Subscription! Back Home About ALLDATA Information View Sample Vehicles Read Testimonials View Factory Service Bulletins and Recall Titles Contact Us
Dowload Our Navigation Chart
February 2015: New vehicles added including 2014 GM.
• View New Vehicles
October 2014: Release of 2013 along with initial 2014 Vehicles
• View Vehicles
View All News and Updates:
• Go To News
Tech Tips
  Read All Tech Tips

ALLDATA Tech Articles Are Updated Weekly
• View All Tech Articles

  Dodge Durango: Brake Pulsation Problems In Paul's Durango
• Read Dodge Article
Fixing A Smelly Audi Audi Tech Tip: A4 begins to Smell caused by a Faulty Hose Composition
• Read Audi Article
Why Do You Need To Change Your Timing Belt? Why Replace Your Timing Belt
• Read Belt Article
Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
Home >> Featured Tech Articles >> Go Back
  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

‘98 Oldsmobile Cutlass, Brake Warning Light

Q: Our brake light goes on for no reason on our '98 Oldsmobile Cutlass. Whenever, it goes on it beeps for a while. Sometimes, the light goes on while we are driving. It might flicker and beep. Sometimes, it beeps when we go forward, sometimes not. Seems to be related to cold and damp weather, but today it is warm and dry and it beeped every time we stopped and started again.

A: There are two components that can cause the brake warning light to turn on. They're the emergency brake switch and/or the brake fluid reservoir's level sensor. More often than not the brake fluid level sensor in the brake master cylinder reservoir is the cause of a complaint such as yours. As the vehicle moves, the brake fluid sloshes around in the reservoir. If the brake fluid is at the minimum level, the movement of the brake fluid will cause the level sensor to report low fluid level and then an okay fluid level. In addition, brake fluid reacts to temperature as any other fluid. It expands when heated. Therefore, when the vehicle is cold the fluid level will be lower, not by a great amount, but lower. As you use your brakes, they become hot. This heat is of course transferred to the brake fluid. This results in the brake fluid to expand, causing the fluid level in the master cylinder to rise. That would explain why the light would be on when the vehicle is first driven (cold), and then goes out as the vehicle is driven. With that, I'll bet a coffee that the brake fluid level is at or below the minimum level indicator of the brake master cylinder's reservoir. One last note, if the brake fluid level is low, it is a good indication, that the brakes on your vehicle may be worn and in need of service or there is a system leak. After you reset the fluid level, oh yes and buy my coffee, have your brakes inspected.

Have any Questions About Please Email Us
Buy Now | Log In | About | Sample Vehicles | Testimonials | Join Affiliate Program