Question about Volvo 780

2 Answers

Sometime when driving, the parking brake indicator light on the instrument panel will light as well as the Parking Brake symbol displayed on the digital dash, accompanated by a buzzer. It will periodically flash on and off. Sometimes this will last for 5 minutes. Sometimes it will go on for 30 minutes, and sometimes the truck will go for 2 weeks without this problem occuring at all. I found the parking brake pressure switch and dissconnected the electrical connection to it but the problem continues. This is a 2006 Volvo Truck VNL780 Highway Tractor,

Posted by on

  • vincentrose Nov 08, 2010

    As I stated before this is a Volvo Highway Truck, not a car!!!! It does not have brake fluid, this truck is equipped with an air brake system!!!

×

Ad

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 2,418 Answers

You can have a bad dash valve, your yellow / red pull valve to set the brakes may be leaking internal. get the truck as quite as you can, build air till the gov. pops and shut off the engine. Listen at the dash for a air leak. Open the hood and look for a yellow hose, (right at the steering rod as it goes into the dash firewall, the end should be right at the fender well). feel the end of this hose for an air leak, if there is air escaping that indicates the dash valve is leaking. Next does the tractor brake lights stay on, if they do, check the switch on the brake pedal, one small air line goes to it this switch. If this switch is bad that can cause your condition. Hope this helps.

Posted on Nov 10, 2010

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Volvo Master
  • 17,970 Answers

Brake failure warning light: If the light comes on while driving or braking, stop immediately, open the hood and check the brake fluid level in the reservoir:
- Fluid level below MIN mark: Do NOT drive. Tow car to shop for check/repair of brake system.
- Fluid level between MIN and MAX mark: proceed immediately and with caution to a Volvo dealer for an inspection of the brake system.

Hope helps.

Posted on Nov 08, 2010

Ad

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

On a 2004 chevy tahoe How do you test to see if the instrument cluster abs and parking brake lights need to be replaced.


They are in a closed loop the ABS and the balance pressure switch. You likely have some kind of problem with ABS system .If one dosn't work it will effect the other light

Mar 15, 2017 | Cars & Trucks

1 Answer

Light abs traction control stays 1998 buick park avenue


PRE-DIAGNOSTIC INSPECTIONBefore diagnosing ABS/TCS, perform a comprehensive visual inspection of system as follows.Check ABS/TCS wiring harness connectors for looseness. Check harness routing; pay particular attention to wheel speed sensor wiring harness routing. Check fuses No. 1D, 5B and 6B in instrument panel fuse block. Check fuses No. 1 and 2 in underhood fuse block. Check brake fluid level in master cylinder reservoir. Check brake fluid level in Pressure Modulator Valve (PMV) assembly reservoir. Ensure parking brake is fully released. Ensure parking brake switch is functioning properly. Always perform ABS/TCS system functional check before using DIAGNOSTIC CODE CHARTSThe EBCM/EBTCM has self-diagnostic capability, which can detect system failures. Fault codes stored by EBCM/EBTCM can be displayed using Tech 1 scan tester. There are no provisions for flash code diagnostics.Begin ABS/TCS diagnosis with PRE-DIAGNOSTIC INSPECTION procedure. If failures are found during pre-diagnostic inspection, perform necessary repairs, and proceed with ABS/TCS FUNCTIONAL CHECK. See Fig. 5 .If no failures are found during pre-diagnostic inspection, go to ABS/TCS FUNCTIONAL CHECK. See Fig. 5 . The ABS/TCS FUNCTIONAL CHECK will either indicate ABS/TCS is functioning properly or direct technician to various diagnostic procedures such as diagnostic charts, symptom diagnosis or BRAKE warning light diagnosis.CHART D - TRACTION OFF WARNING LIGHT ON CONTINUOUSLY & NO DTC SET (BUICK WITH UH8 OR U2A INSTRUMENT CLUSTER)Circuit DescriptionWhen ignition switch is first turned to RUN position, EBTCM goes through a self-test, which lasts 2-4 seconds. During self-test, EBTCM commands TRACTION OFF indicator warning light on. Powertrain Control Module (PCM) can also command EBTCM to set a Code 75 which will illuminate TRACTION OFF indicator.Traction control switch is located either on instrument panel center trim plate or driver's front door trim panel. Switch allows driver to select traction control mode (on/off). When traction control system is turned off, TRACTION OFF warning light comes on.EBTCM monitors transaxle temperature through

Jul 12, 2014 | 1998 Buick Park Avenue

1 Answer

Why is brake fluid warning light on but there is brake fluid


From Fiat LOW Brake Fluid / Parking Brake Either the exclamation mark symbol or the 'BRAKE' dashboard symbol may be used on various models of the Fiat 500. Light should illuminate until engine has started. If light remains on, it signifies the parking / hand brake is on, or that there is insufficient brake fluid in the reservoir. If light illuminates and the handbrake is not applied, braking may become defective. Seek assistance from a Fiat technician immediately.

Check to make sure your parking/hand brake is fully released, sometimes the spring that pushes back on the mechanism isn't strong enough, doesn't push back all the way, and the brake indication switch isn't engaged.
The other possibilities are that the float in the master brake cylinder is stuck (if it has one), or the level sensor has failed.

Jun 15, 2014 | 2013 Fiat 500

1 Answer

Hand brake lamp on instrument panel


The light is not only used to indicate that the parking brake is on, but also indicates that there is a problem with the braking system. Make sure your brake fluid is topped off.

Jun 27, 2012 | 2001 GMC Yukon XL

1 Answer

Hummer H3 airbag light wont go off


Airbag light on in a Hummer H3 Dashboard???Here is the fix...
Start the engine of your car, set the parking brake, hold the regular brake pedal down with your right foot. Push down the parking brakepedal to its fully-applied position with your left foot. Now while you are still holding the regular brake pedal down. Quickly release the parking brake, Pull the bottom edge of the lever, located above the parking brake pedal, with the parking brake
symbol, directly rearward to release the parking brake. Make sure pedal snaps hard all the way back releasing the parking brake... If this doesn't work the first try, try it 3-5 times and it shall work... The airbag light will go off...


NOTE: The parking brake pedal is located to the left of the regular brake pedal, near the driver's door.
&

The parking brake lever is located above the parking brake pedal, with the parking brake symbol.

May 28, 2012 | 2006 Hummer H3

1 Answer

How do you set up electric hand brake after fitting rear pads?(appears to be binding on).on s type jaguar.


Bulletin from Jaguar :

Electronic Park Brake (EPB)
Re-Calibration Procedure
2003 MY-ON
S-TYPE
M44998-ON

Issue:
On some 2003 MY-on S-TYPE vehicles, a customer may report a concern of premature
parking brake pad wear or the brakes binding. This condition can result if the electronic
park brake (EPB) system is not re-calibrated after the removal of the rear brake callipers
to replace the brake pads.
Action:
Should a customer express concern regarding the above, refer to the calibration
procedure detailed in this bulletin.

1. Reset the EB module:
a. Switch off the ignition.
b. Disconnect the battery for 30 seconds. For additional information, refer to STYPE
Workshop Manual Section 414-01.
c. Reconnect the battery.
2. Start the engine.
3. Firmly apply and release the foot brake five times.
4. Confirm that the message NOT CALIBRATED" or APPLY FOOT AND PARK
BRAKE" is displayed on the instrument cluster message center. This indicates that
the parking brake is in calibration mode.
5. Lightly press the foot brake pedal.
6. Apply the parking brake by using the EB switch.
7. Release the parking brake.
8. Release the foot brake.
9. Confirm that the brake warning lamp is no longer illuminated on the instrument
pack and that the NOT CALIBRATED" message is no longer displayed in the
message center.
10. Apply and release the EPB five times to ensure no error is present.
_____________________________________________________________________________

NB: It is also possible the actuator is bad though.

Jan 17, 2011 | Jaguar S-Type Cars & Trucks

1 Answer

"!" Indicator light on 2008 Chev Trailblazer


If the ! symbol you saw is inside a circle enclosed in parentheses like (O), and usually red in color, that's for your brake fluid. Check it out, maybe its low on fluid. If it is, check for fluid leaks or worn brakepads. Usually the ! symbol coincides with the P symbol and also red in color. When the park brake is engaged, both these symbols appear together. If you release the park brake, both indicators should turn off under normal conditions, otherwise either of the two or both will stay on when there is insufficient fluid or there's a parking brake circuit fault. Brakes are very important, so give proper attention and solution if ever these indicators lightb up when they shoud not.
If the ! symbol is very bold and inside a half drawn flat tire, and yellow in color, thats the tire pressure monitor indicator. Check and balance all four tire pressures to the correct specification.
Okay, sir? have a safe trip. : )

Nov 29, 2010 | 2008 Chevrolet Trailblazer

1 Answer

Parking Brake Alarm


inset the key and switch on to position 2
Scroll through the warning display untill you get the service indicator apears
Press and hold the reset button on the left of the dash apnel for about 4 mins
You will be asked if you want to reset
Press anh hold the reset button again until you hear an audible warning
It should now show the new interval to a service

Jun 13, 2008 | 2008 Mercedes-Benz Mercedes Benz C Class

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

952 people viewed this question

Ask a Question

Usually answered in minutes!

Top Volvo Experts

yadayada
yadayada

Level 3 Expert

76673 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8531 Answers

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

Answer questions

Manuals & User Guides

Loading...