Mercedes-Benz S420 Brake Light Switch Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings

(13)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Customer Ratings

(13)

Brake Light Switch Replacement Service

How much does a Brake Light Switch Replacement cost?

On average, the cost for a Mercedes-Benz S420 Brake Light Switch Replacement is $140 with $45 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1998 Mercedes-Benz S420V8-4.2LService typeBrake Light Switch ReplacementEstimate$204.65Shop/Dealer Price$244.57 - $324.94
1994 Mercedes-Benz S420V8-4.2LService typeBrake Light Switch ReplacementEstimate$184.65Shop/Dealer Price$224.60 - $304.99
1997 Mercedes-Benz S420V8-4.2LService typeBrake Light Switch ReplacementEstimate$184.65Shop/Dealer Price$224.60 - $304.99
1995 Mercedes-Benz S420V8-4.2LService typeBrake Light Switch ReplacementEstimate$184.65Shop/Dealer Price$224.56 - $304.92
1996 Mercedes-Benz S420V8-4.2LService typeBrake Light Switch ReplacementEstimate$184.65Shop/Dealer Price$224.62 - $305.04
1999 Mercedes-Benz S420V8-4.2LService typeBrake Light Switch ReplacementEstimate$184.65Shop/Dealer Price$224.60 - $304.99
Show example Mercedes-Benz S420 Brake Light Switch Replacement prices

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.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert Mercedes-Benz mechanics

Real customer reviews from Mercedes-Benz owners like you.

Excellent Rating

(13)

Rating Summary
12
0
1
0
0
12
0
1
0
0

Eric

15 years of experience
133 reviews
Eric
15 years of experience
Mercedes-Benz S420 V8-4.2L - Oil Change - Bowie, Maryland
Kept me informed for his arrival. Was very friendly.

Melvin

17 years of experience
221 reviews
Melvin
17 years of experience
Mercedes-Benz S420 V8-4.2L - Trunk does not lock or open - Atlanta, Georgia
I am a independent private driver, and my trunk, passenger doors, engine light, sunroof all began to malfunction at the same time on my s500 Mercedes Melvin came out in the cold and in 30 minutes knew exactly what all the problems were. His knowledge is superb! I will be using Mr Melvin again.

Kenneth

20 years of experience
775 reviews
Kenneth
20 years of experience
Mercedes-Benz S420 V8-4.2L - Oil Change - Los Angeles, California
He is the real deal... On time, did great work, very all together" good man and mechanic...... Thanks Kenneth.

Peter

43 years of experience
1321 reviews
Peter
43 years of experience
Mercedes-Benz S420 V8-4.2L - Transmission fluid is leaking Inspection - Phoenix, Arizona
Awesome mechanic and great knowledge

Excellent Rating

(13)

Rating Summary
12
0
1
0
0
12
0
1
0
0
Number of Mercedes-Benz S420 services completed
143+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
experts on our platform

Recent articles & questions

P0055 OBD-II Trouble Code: Heater Circuit Resistance (Bank 1, Sensor 3)
P0055 P0055 code definition Heater Circuit Resistance (Bank 1, Sensor 3) What the P0055 code means When this code is set it means that the Engine Control Module (ECM) has detected a problem with the amount of resistance in the...
P0418 OBD-II Trouble Code: Secondary Air Injection System Relay A circuit Malfunction
P0418 indicates that a problem has occurred in the secondary air injection system which causes engine hesitation when accelerating and stalling.
P0699 OBD-II Trouble Code:Sensor Reference Voltage “C” Circuit High
P0699 means a fault in the sensor reference C circuit, which also affects the alternative fuel, body, anti-lock brake, and other control modules.

Car steering locked in intersection

Hello there, this sounds like an rare situation. The whistling sound with the Check Engine Light would have a few possible symptoms. Most likely there would be an exhaust leak or a vacuum leak. Either could also set the Check...

Key will lock doors and trunk, but not unlock doors on 2004 BMW 645Ci

Hi there. The first thing I would do is try another key to see if you get the same results from the key control. If the separate key works, then it is the key that is the problem. If not,...

i got coode p000b on my 2011 charger bank 1 sensor 2 what part should i get for this

Before replacing any parts on your vehicle I would recommend having your vehicle inspected by a qualified professional to determine the exact cause of the check engine light. Although the check engine light code mentions an O2 sensor, this can...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com