Mercedes-Benz 300SD Brake Light Switch Replacement at your home or office.

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Average rating from customers who
received a Brake Light Switch Replacement.
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$117.11 - $131.76

Price range for all vehicles


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Average rating from customers who
received a Brake Light Switch Replacement.
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Brake Light Switch Replacement Estimate for Mercedes-Benz 300SD

Mercedes-Benz 300SD Brake Light Switch Replacement costs $123 on average.

CarServiceEstimateShop/Dealer Price
1985 Mercedes-Benz 300SDL5-3.0L Turbo DieselService typeBrake Light Switch ReplacementEstimate$159.23Shop/Dealer Price$198.51 - $269.73
1981 Mercedes-Benz 300SDL5-3.0L Turbo DieselService typeBrake Light Switch ReplacementEstimate$159.23Shop/Dealer Price$198.41 - $269.55
1982 Mercedes-Benz 300SDL5-3.0L Turbo DieselService typeBrake Light Switch ReplacementEstimate$159.23Shop/Dealer Price$198.51 - $269.73
1992 Mercedes-Benz 300SDL6-3.4L Turbo DieselService typeBrake Light Switch ReplacementEstimate$173.53Shop/Dealer Price$213.88 - $291.13
1993 Mercedes-Benz 300SDL6-3.4L Turbo DieselService typeBrake Light Switch ReplacementEstimate$168.53Shop/Dealer Price$213.08 - $293.48
1980 Mercedes-Benz 300SDL5-3.0L Turbo DieselService typeBrake Light Switch ReplacementEstimate$159.23Shop/Dealer Price$196.37 - $265.99
1978 Mercedes-Benz 300SDL5-3.0L Turbo DieselService typeBrake Light Switch ReplacementEstimate$159.23Shop/Dealer Price$192.99 - $260.07
1984 Mercedes-Benz 300SDL5-3.0L Turbo DieselService typeBrake Light Switch ReplacementEstimate$164.23Shop/Dealer Price$201.00 - $270.33
Show example Mercedes-Benz 300SD Brake Light Switch Replacement prices

Brake Light Switch Replacement Service

What is the brake light switch and how does it work?

The brake light switch is a mechanical switch activated when you press the brake pedal. The switch has a plunger in it that contacts a lever in the brake pedal assembly. As that plunger is depressed when you push on the brake pedal, the contacts in the brake light switch closed and voltage flows to the brake lights — turning them on. The brake light switch is also in the circuit that controls the cruise control disengagement and the shift interlock safety feature installed on all newer cars. Failure of the brake light switch occurs due to wear on the internal electrical contacts in the switch, poor switch terminal connections, maladjustment of the switch, or damage to the brake pedal assembly.

When to consider replacing the brake light switch?

  • No brake lights. If depressing the brake pedal does not cause any of the brake lights to illuminate, the continuity of the switch will be tested. If only one brake light is out, then the issue is not the switch but rather the bulb, bulb socket or brake light circuit integrity.
  • Unable to shift out of park. The brake light switch is also wired into the shift interlock mechanism. If you are unable to shift out of park, with your foot on the brake, check to see if the brake lights will illuminate as you push the pedal. If they do not illuminate, failure of the brake light switch may be the cause of the no shift.
  • Intermittent operation of the brake lights or late operation. The brake light switch has to be in the proper position, and work consistently if the brake lights are to come on the instant you press the brake pedal. The switch can sometimes require adjustment, or the contacts may degrade, causing inconsistent operation of the switch.

How do mechanics replace the brake light switch?

  • The switch is first tested using a multimeter, including the terminal contacts to the switch, to determine if it is faulty. If the switch is functioning, the entire circuit must be tested to determine the cause of no brake lights.
  • Should the switch be judged defective, the switch is unthreaded from the mounting boss near the brake pedal assembly.
  • The new switch is threaded in and locked with an appropriate locknut once the new switch is properly adjusted.
  • The operation of the switch is tested to ensure instant illumination of the brake lights upon pressing the brake pedal.

Is it safe to drive with a brake light switch problem?

No. Should the brake light switch have failed, it is unsafe to drive the vehicle because drivers behind you will have no indication that you are slowing, intend to slow, or are stopped. Always address a failure of this type promptly to ensure your safety while driving.

When replacing the brake light switch keep in mind:

  • The mechanic will test the brake light switch directly to ensure that the issue is not elsewhere in the brake light circuit.
  • Occasionally, the issue is a maladjusted switch or a loose contact, and the mechanic can resolve the problem without switch replacement.

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Meet some of our expert Mercedes-Benz mechanics

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Excellent Rating


YourMechanic Mercedes-Benz 300SD Service

Average Rating

4.7/5

Number of Reviews

6

Rating Summary
5
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1
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5
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Trevor

20 years of experience
169 reviews
Trevor
20 years of experience
Mercedes-Benz 300SD - Alternator Belt - Encinitas, California
Trevor showed up on time and had the work completed within the estimated time. Professional and friendly. I highly recommend Your Mechanic and Trevor. This was so easy, no up charges or surprises. I will use Your Mechanic for future auto services.

Bacle

15 years of experience
60 reviews
Bacle
15 years of experience
Mercedes-Benz 300SD - Brake Pads Replacement (Front) - Mountain View, California
He will fix your problem no matter how much time it takes.

Braxton

9 years of experience
190 reviews
Braxton
9 years of experience
Mercedes-Benz 300SD - Car is not starting - Orlando, Florida
Very kind and helpful. Fast service and very courteous.

Jim

31 years of experience
61 reviews
Jim
31 years of experience
Mercedes-Benz 300SD - Coolant is leaking - San Ramon, California
Identified the problem immmediately

Excellent Rating


YourMechanic Mercedes-Benz 300SD Service

Average Rating

4.7/5

Number of Reviews

6

Rating Summary
5
0
1
0
0
5
0
1
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Red-stars EXCELLENT RATING ON
Number of Mercedes-Benz 300SD services completed
66+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
800+
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