Question about 2003 GMC Sonoma Extended Cab

1 Answer

Noise under dash when applying brake pedal

I have a 2003 GMC Sonoma that I recently purchased. This last week, I have noticed a sort of thump sound that comes out from under the dash when I apply the brake pedal. The sound appears to be coming from up under the dash above the emergency brake area. I don't belive the sound is coming from the engine compartment but have no idea what brake coponenets are under the dash. Any thoughts?

Posted by on

  • 3 more comments 
  • snlfinds Apr 20, 2009

    I generally don't use the parking brake. This sound happens everytime I apply the brakes while driving. It has gotten to be everytime now. It is a faint thunk sound that sounds like it is under the dash along the left side panel or directly above. There isn't any brake components there..correct?

  • snlfinds Apr 20, 2009

    Truck is an automatic. Noise is more of a clunk sound than click. If you are driving alone and apply the brakes, noise typically happens not upon initial pressure on pedal but as truck is slowing down. Almost like pedal has paritally traveled down before noise occurs. This is just a tough one to explain. Are there any specific components to look for under the dash in thsi area. I swear it almost sounds like some component or something is shifting up under the dash.

  • snlfinds Apr 20, 2009

    cadman000...thanks for your hlep with this. This morning, I may have figured something out. When I pull up tightly on the emergency brake, the noise doesn't happen when applying the brakes. Is it possible for some reaction to occur through the emergency brake cable up to the foot pedal when the back brakes are actuated? They are disc brakes all around.

  • Eric Heifetz
    Eric Heifetz May 11, 2010

    First my previous statement had NOTHING to do with parking brake. Not sure if you're driving an auto trans or standard,. Automatic transmissions have a shift interlock. Now here's the kicker. You say "while driving and applying brakes. COULD there be something in that area trying to keep on moving forward , when you are trying to stop, CLUNK ?

  • Eric Heifetz
    Eric Heifetz May 11, 2010

    sounds to me like the Park / Brake Interlock solenoid clicking to electrically allow you to shift out of Park. Some solenoids louder than others. I should qualify by asking . Do you hear this when you are moving upon brake apply, or can you be sitting still ?

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 607 Answers

Well, now being 60, might be a bit of a challange for me , but if I had to..... anyway dress comfortably, push the front seat back as far as you can. Now lay on your back looking up UNDER the L/S of the dash where you hear the noise and LOOK. for something loose. Open the hood, look for something loose under the L/S of the windhield. Nothing to lose. Hope this helps

Posted on Apr 20, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My 1997 GMC Sonoma SLS is stuck in park. I believe it is due to a failed stop light switch. Where is that switch located and how do I replace it. How do I by-pass that switch to get the truck out of...


The brake lamp switch is located on the brake pedal assembly under the dash. (See Diagram)

To move the vehicle, try this:

1. Turn the key to OFF.
2. Apply and hold the brake until the end of Step 4.
3. Shift the transmission to NEUTRAL (N).
4. Start the vehicle and then shift to the drive gear
you want



dttech_191.gif

Sep 04, 2011 | 1997 GMC Sonoma

2 Answers

How do i know if brake booster is gone ? 2001 gmc


Do you by any chance hear a hissing noise from under the dash? If so, yes, you have a bad booster. For it to do what you're saying, it would almost have to have a vacuum leak. However, if there is a problem with something in the ABS system, you should have an ABS warning light on. Also, ABS can make the pedal fade, but I've never heard of it making the pedal hard. Your diagnosis of a brake booster does sound likely, but I'll admit I can't be sure -- this is an odd one.

Mar 10, 2010 | 2001 GMC Sonoma Extended Cab

1 Answer

Brake noise


replace the master cylinder bleed valve

Jun 23, 2009 | 2003 BMW 325

1 Answer

2001 gmc sonoma sls brake lights wont turn off


Check the brake light switch, under dash near top of brake pedal, either a bad switch, or the button is stuck in.

Apr 26, 2009 | 2002 GMC Sonoma Extended Cab

1 Answer

Knocking noise from rear when hand brake applied.


i recently had 4 tyres fittede and tyre company had crossed threaded one stud so forcing brake disc to be loose, hence when handbrake applied got thump from brake area.

Apr 18, 2009 | 1998 Subaru Impreza

3 Answers

Air bag remove 98 gmc sonoma


It's unlikely the turn signal switch. Try disconnecting the switch mounted directly above the brake pedal. If the light turns off the problem is in the brake switch. They commonly go bad and can be picked up at a gm dealer for about $15.

Apr 15, 2009 | 1996 GMC Sonoma

1 Answer

2005 honda accord noise when breaking (transaxle)


You say you hear the noise when you "slow down". Does this mean you hear the thumping noise when you let off the gas and let the car coast to a stop or only when you are applying the brakes to decellerate?
If you only hear the noise while applying the brakes then I would assume it has something to do with your brakes. The first thing that comes to mind would be rotors that aren't true or warped which could make a thumping sound.

Do you feel any vibrations in your foot when it is applying pressure to the brake pedal? If you do feel a sort of pulsating feeling then it could very well be your brakes making the noise.

I hope I was of some assistance,
AadoubleA

Apr 04, 2009 | 2000 Honda Accord

1 Answer

Where is the brake/park islinode on a 2003 envoy by gmc


under the driver's side dash near the upper part of the brake pedal. You'll have to lay on your back under the dash to see it. You might hear it " click" when the brake pedal is depressed.

Mar 29, 2009 | 2003 GMC Envoy

1 Answer

1991 jeep comanche brakes


check under dash for leaking vaccum switch. usually manufacturers use vac switches to release the e-brake automatically when applying the brake.

Jul 17, 2008 | 1991 Jeep Comanche

Not finding what you are looking for?
2003 GMC Sonoma Extended Cab Logo

325 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75822 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...