Question about 1998 Pontiac Grand Prix

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98 Grand Prix

The connector to the ABS Brake Modulator Box just in front of the brake booster needs to be unplugged so I can remove the module but I do not want to force it and not certain how it is supposed to unplug, IE if there is a latch or key I can not see.

I need to remove the assy to get to the AC Orifice Tube.

Thanks

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So many times today, someone thinks they have found someone that cares and wants to contribut to the world, only to find another wolf in sheeps clothing whispering I want to be kind and help were I can only to find someone waiting with baited breath to take your money. That is exactly what I found when I went to your falsely advertised site and was told I have to pay to find anything so I logged off and this morning went by the dealer and got some kind advise.

No thanks to your site now do not email me again !!!!!!

Posted on Jun 30, 2008

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is this an ABS question.
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or do you mean
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I cannot get what I feel is a good firm pedal. I have bled the brakes a least 4 times using the proper service manual procedure as well as pressure bleeding. I have gone through 3 qts. of new brake fluid....


i say you are wrong. if the brakes are hard, pumped 3 times
or more after engines stalls, that hydraulic system is not with air
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err 1965? with dual brakes......

so it's a booster /vacuum issue.
some booster need calibration, not just thrown on.
if you run all the FSM booster checks, read the FSM??????
Factory service manual???

worse of all , you never said why you were bleeding at all.
it just one day, got funky
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RTM , no , read it twice.
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wyet_helps_28.gif 1. secondary air injection
2. Electronic Brake Control Module
3. brake pressure modulator valve

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How to trouble shoot the brake system?


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Hydraulic Modulator
Basically this unit holds steady or bleeds off pressure in brake line, as necessary, when the Electronic Brake Control Module (EBCM) detects an abnormal deceleration in the speed of the wheel. On 2000 and later models the EBCM and Brake Pressure Modulator Valve (BPMV) are mounted on a bracket attached on the left strut tower.
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Disk brake caliper, disk brake pads, drum brake shoes, master cylinder, master cylinder reservoir, O-rings replacement, parking brake adjustment, parking brake cables inspect and replacement, parking brake shoes-replacement, power brake booster, check or replacement, wheel cylinder inspect and replace.

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1995 Honda Accord EX - 4cyl - when we start the car there is a loud alarm sounding buzz and the the ABS brake light comes on. We still have brakes, but it doesn't shutter like the ABS. What's the problem


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1994 Cavalier -replaced master cylinder-no pressure to rear brake


The most common bleeding procedure is to bleed the ABS brake furthest from the master cylinder first, then bleed the other brake that shares the same hydraulic circuit (which may be the other rear brake on a rear-wheel drive car, or the opposite front brake on a front-wheel drive car or minivan). After these have been bled, you then bleed the other brake circuit starting with the furthest brake from the master cylinder.
Air can be very difficult to remove from an ABS modulator assembly because of all the nooks and crannies inside the unit. The modulator may have eight to 10, or more, ABS/traction control solenoid valves, plus various check valves and dead-end ports. Some ABS modulators have special bleed screws to help you vent the trapped air when bleeding the system. Others do not and require the use of a scan tool to cycle the ABS solenoids while you bleed the system. 1. To bleed the isolation valves in the modulator, there are two bleeder screws. Start with the one toward the engine. Turn the ignition on and apply light pressure on the brake pedal. Open the bleeder screw and allow the fluid to flow until clear. Close the screw and do the same at the second bleeder screw. 2. Depressurize the accumulator by pumping the pedal 40 times with the key off. Wait about two minutes for the brake fluid to de-aerate, then refill the fluid reservoir with DOT 3 brake fluid. 3. Now you can bleed the boost section. This is done by applying moderate pressure on the brake pedal and turning the ignition on for three seconds, then off. Repeat this a total of 10 times. Make sure the pedal feels firm when you have finished, and give the car a road test to make sure the brakes are working properly.

Mar 15, 2009 | 1994 Chevrolet Cavalier

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
---------------------------------------------------------------------
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.
cd31596.gif
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

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