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eric
eric, Automotive Repair Shop Manager
Category: Nissan
Satisfied Customers: 31301
Experience:  Automotive Repair Shop Manager, Technician/JA Mentor
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Why is brake light on, on the dash of our 2009 altima?

Resolved Question:

why is brake light on, on the dash of our 2009 altima?
Submitted: 6 years ago.
Category: Nissan
Expert:  eric replied 6 years ago.

Hi,

 

Is it the Red brake warning light, or the Amber ABS brake light that is on?

 

Have noticed any difference in feel of the brake pedal- does it travel further before engaging the brakes?

 

Any kickback or pulsation in the brake pedal at very low speed braking?

Customer: replied 6 years ago.

Hi Eric,

 

I have not noticed any change in the pedal, it is the red light, and it only comes on intermittently, usually at lower speeds.

 

Thanks,

Tracy

Expert:  eric replied 6 years ago.

Hi,

 

Ok, two most common reasons for red brake light coming on - either a leak in the brake hydraulic system or brake pads wearing.

 

Because the light only comes on intermittently, I believe the pads may be wearing enough to cause the light to come on at times. When brake pads wear and become thinner, the fluid in the brake master cylinder resevoir becomes lower as more fluid is needed at the brake calipers to extend its piston out further to engage the pads. As a result, the level can drop enough to trigger the warning light when lowered fluid level sloshes around in the resevoir.

 

Check the resevoir level( master cylinder resevoir is located atop master cylinder which is at the firewall in engine compartment on the driver's side.

 

If level is low, you need to have the brake pads checked and replace as needed

eric and other Nissan Specialists are ready to help you
Expert:  eric replied 6 years ago.

Ok, two most common reasons for red brake light coming on - either a leak in the brake hydraulic system or brake pads wearing.

 

Because the light only comes on intermittently, I believe the pads may be wearing enough to cause the light to come on at times. When brake pads wear and become thinner, the fluid in the brake master cylinder resevoir becomes lower as more fluid is needed at the brake calipers to extend its piston out further to engage the pads. As a result, the level can drop enough to trigger the warning light when lowered fluid level sloshes around in the resevoir.

 

Check the resevoir level( master cylinder resevoir is located atop master cylinder which is at the firewall in engine compartment on the driver's side.

 

If level is low, you need to have the brake pads checked and replace as needed