Question about 1994 Chevrolet Suburban

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What could be problem if my 1994 1500 suburban brakes are locking on a sudden stop.

My (ABS) light comes on after 15mph is pass and on a normal gradual stop brakes work fine but when pressed hard the pedal locks down. I was wondering what could be the cause

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  • Chevrolet Master
  • 3,218 Answers

If the vehicle does not have ABS brakes, The wheels will lock on a hard/panic stop. This is why ABS was developed so the operator can maintain some control during hard/panic stops

Posted on Apr 06, 2015

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3 Answers

Can i un-A.B.S. MY 1997 ford falcon futura wagon,


the ABS is a system that allows wheels that have stopped turning under brakes to turn again momentarily
the brakes work through the abs system normally at all times from the booster and it is only when a wheel stops turning that the electric motor in the abs unit provides pressure to a line to compensate for the fluid returned by the valve in that line that was opened when the wheel stopped
you can disconnect power to the abs ( fuse ,relay) and the brakes will still operate normally except that when in extreme braking situations the wheels will lock up and steering control will be the same as pre abs cars ( side skid and not able to steer around an object)
there may be a abs light come on but you will have to live with that
best talk with an accredited brak specialist shop as they may have an idea as to what can be done to bypass the abs
remember that the abs is part of the vehicle safety requirements and in by passing it or making it inoperable you may be making the vehicle un-roadworthy for the purposes of inspection and insurance.

Aug 13, 2015 | Ford Cars & Trucks

1 Answer

Abs code 81


This one is considered a "soft fault" and will not show up until 15 mph when it turns on the light. Your switch could be OK and something else in Circuit #420 (that's the factory number for the circuit). What the light really means is the BPMV is not seeing the brake switch signal.
After a little more reading your condition is probably caused by an open brake switch circuit (bad switch). Happy to help. Drove me nuts and I was sweating having to buy a new ABS unit. Switch was like $15.00 and adjusts itself.

Jun 14, 2012 | 1993 GMC Safari

1 Answer

ABS light on when cold, then goes off. The brakes grab and lock when stopped and will not release without major coaxing. It seems they engage at low cornering turns acting as if the vehicle is in 4wd....


Sounds like you have sticking caliper pistons, have you ever changed brake fluid? Replace calipers and flush brake fluid and clean ABS sensors with
ABS safe brake clean.

Feb 02, 2010 | 1997 Chevrolet Suburban

1 Answer

Recently service 4 wheel drive lamp came on. And brake slide when


Check the electro-hydraulic control unit mounted on the left side frame underneath the cab. Its made up of the brake pressure modulator valve (bpmv) and the electronic brake control module (ebcm). This controls hydraulic pressure to the brake calipers to prevent wheel lock up. Also check the abs sensor mounted on the transfer case.

Dec 20, 2009 | 1999 Chevrolet Suburban

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Caliper crunch


Make sure the pads are installed correctly. There is an inner and an outer. make sure the hardware is lubricated with some brake lube. For the ABS/Traction lights, you will need a scan tool to find out what is going on.

Jun 29, 2009 | 1999 Pontiac Grand Am GT

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Dash board parking brake and ABS lights stay


you have an abs fault. have your abs system scanned for codes.

your base brakes will continue to function normally

Apr 13, 2009 | 2002 Chevrolet Suburban 2500

1 Answer

Problem with my cruise control and ABS light on 03 Explorer


Anti-Lock Control —Vehicles Built After 03/2002 The 3-channel anti-lock brake system consists of the following components:
  • front wheel speed sensors
  • front wheel speed sensor rings
  • hydraulic control unit (HCU)
  • Anti-lock brake control module (ECU)
  • rear wheel speed sensor
  • rear wheel speed sensor rings
  • yellow anti-lock brake warning indicator
The 4-channel anti-lock brake system with traction control and stability assist system consists of the following components:
  • active brake booster with integral solenoid
  • brake booster release switch
  • front wheel speed sensors
  • front wheel speed sensor rings
  • hydraulic control unit (HCU)
  • stability assist module (ECU)
  • stability assist event indicator
  • lateral accelerometer
  • longitudinal accelerometer (4x4)
  • rear wheel speed sensors
  • rear wheel speed sensor rings
  • steering wheel position sensor
  • yaw rate sensor
  • yellow anti-lock brake warning indicator
  • brake pressure transducer
  • traction control switch
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I suspect the abs issue is causing the speed control not to work if it happened at the same time the cruise control stopped working. When the yellow ABS light comes on, it means the ABS is dactivated. You may have a faulty accelerometer which senses acceleration and yaw (side to side lean). I have not seen a bad one but you said it is sensitive to acceleration.
I would unplug it and see what happens. The connector should have a small tab to depress so you can pull the connector out.
Here is where it is:

Accelerometer Removal and Installation
  1. NOTE: The accelerometer is located under the center, rear passenger seat carpet. (I think you have to remove seat for access).
    Cut the carpeting along the perforations.
  1. Disconnect the electrical connector.
  1. Remove the nuts and remove the accelerometer.
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Have dealer hook up tester and pull fault codes if you can't find an easy solution.
Some background info
  • A malfunction in the anti-lock brake system will cause the anti-lock brake control module to shut off or inhibit the system. However, normal power-assisted braking remains.
  • Malfunctions are indicated by the yellow ABS warning indicator in the instrument cluster.
  • The anti-lock brake system is self-monitoring. When the ignition switch is turned to the RUN position, the anti-lock brake control module will carry out a preliminary self-check on the anti-lock electrical system indicated by a three-second illumination of the yellow ABS warning indicator in the instrument cluster.
  • During vehicle operation, including normal and anti-lock braking, the anti-lock brake control module monitors all electrical anti-lock functions and some hydraulic operations.
  • Each time the vehicle is driven, as soon as vehicle speed reaches approximately 20 km/h (12mph), the anti-lock brake control module turns on the pump motor for approximately one-half second. At this time, a mechanical noise may be heard. This is a normal function of the self-check by the anti-lock brake control module.
  • Pedal pulsation coupled with noise while braking on loose gravel, bumps, wet or snowy roads is normal and indicates correct functioning of the anti-lock brake system.
  • Warning Lamp Indicator
    The anti-lock brake system (ABS) uses the yellow ABS warning indicator to alert the driver of a malfunctions in the ABS.
    The yellow ABS warning indicator will come on to warn the driver that the ABS has been turned off due to a symptom that exists in the ABS. Normal power assist braking remains but wheels can lock during a panic stop while the yellow ABS warning indicator is illuminated.

    -----------------------------------------
    Please report back, I am curious if that is what it is. Good luck

    Mar 03, 2009 | 2003 Ford Explorer

    2 Answers

    2002 Suburban ABS System Brake Light


    I have had this same problem on two difference vehicles both of which are suburbans.

    The solution is simple.
    Remove the engine cover.
    Locate a small ground wire that is bolted to the top rear of the engine block on the passenger side.
    Remove the bolt, clean surfaces and replace.

    This should solve your problem.

    I know it seems too easy but it works.

    Aug 22, 2008 | 2002 Chevrolet Suburban 2500

    1 Answer

    Abs relay


    Good Day,

    The easiest solution is to locate the abs fuse in the fuse box. Remove that fuse and ABS is now disabled(this will trip you abs light), brakes will function normal but keep in mind you will lock the wheels up under heavy braking. Possible cause are bad abs sensors, or bad abs module. If you don't mind no abs then problem solved, otherwise take it to a shop and have a code pulled from the abs module to diagnose further.

    Hope this helps and Good Luck

    Jun 30, 2008 | 2001 Chevrolet Suburban

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