Question about 1991 Chevrolet S-10 Blazer

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Having problem w/ the antilock system....replaced the master as per instructions....reapplied harness and battery cable....light still on and brake light too... i looked about antilock unit and found two fittings(zerk)...with pressure applied to brake peddle i attempted to bleed system...fitting closest to motor did spit some air...but the other one(nearest to the fender) was without fluid...(BONE DRY!!) I also noticed two button like items on the side of the unit that actuate in/out....Please help, as I can't afford to have a professional to repair it. P.S. am very mechanicaly inclined

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  • Salvador Quintanilla May 11, 2010

    You need to find out what codes you have.You must have had a code at first if the instructions told you to replace the master.This master you are talking about is the ebcm Electronic Brake Control Module.There are special tools that go into these buttons on the side. PS. I hope you were not suppose to replace the master cylinder.

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  • Master
  • 3,600 Answers

You Have to bleed the whole system just like a regualer barke systey and tun ing. gey tothe run postion and off 5 times to cear the fault codes.

Posted on Jul 29, 2009

  • Bruce Hathcock Jul 29, 2009

    have you solved your problem or need more help? please rate me when we are done.

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Can leaky shocks on a 2006 Cadillac DTS cause the traction control light to come on


If the light is on there are DTC'S - diagnostic trouble code's stored in ABS - anti - lock brakes computer . Have codes checked first , something wrong with electrical part of antilock brakes , I know, what does ABS have to do with traction control ! traction control is a function of the ABS control module . Leaking shocks ? clarify , air shocks etc.... Before you start guessing , have it check for codes .
This vehicle is equipped with the TRW 440 V antilock braking system.
The vehicle is equipped with the following braking systems:
?€¢
Antilock Brake System (ABS)


?€¢
Engine Drag Control (EDC)


?€¢
Dynamic Rear Proportioning (DRP)


?€¢
Traction Control System (TCS)


?€¢
Vehicle Stability Enhancement System (VSES) (w/JL4)

The following components are involved in the operation of the above systems:
?€¢
Electronic brake control module (EBCM)--The EBCM controls the system functions and detects failures.


?€¢
Electronic brake control module (EBCM)--The EBCM controls the system functions and detects failures.


The EBCM contains the following components:


-
System relay--The system relay is energized when the ignition is ON and no ABS DTCs are present. It supplies battery positive voltage to the solenoid valves and pump motor.


-
Vent tube--The vent tube, located in the EBCM connector, is an opening to the internal cavity of the EBCM. It allows ventilation of the EBCM internals.


?€¢
Brake pressure modulator valve (BPMV)--The BPMV contains the hydraulic valves and pump motor that are controlled electrically by the EBCM. The BPMV uses a 4 circuit configuration with a diagonal split. The BPMV directs fluid from the reservoir of the master cylinder to the left front and right rear wheels and fluid from the other reservoir to the right front and left rear wheels. The diagonal circuits are hydraulically isolated so that a leak or malfunction in one circuit will allow continued braking ability on the other.


Important: There is a rubber isolator located under the BPMV and on the mounting studs. The rubber isolators protect the BPMV and the EBCM from vehicle vibrations.


?€¢
The BPMV contains the following components:


-
Pump motor


-
Inlet valves (one per wheel)


-
Outlet valves (one per wheel)


-
Master cylinder isolation valves (one per drive wheel)


-
Prime valves (one per drive wheel)


?€¢
Wheel speed sensors (WSS)--As the wheel spins, the wheel speed sensor produces an AC signal. The EBCM uses this AC signal to calculate wheel speed. The wheel speed sensors are replaceable only as part of the wheel hub and bearing assemblies.


?€¢
Traction control switch--The TCS is manually disabled or enabled using the traction control switch.


?€¢
Stoplamp switch--The EBCM uses the stoplamp switch as an indication that the brake pedal is applied.


?€¢
Lateral accelerometer sensor (w/JL4)--The EBCM uses the lateral accelerometer sensor as an indication of the lateral acceleration of the vehicle.


?€¢
Yaw rate sensor (w/JL4)--The EBCM uses the yaw rate sensor as an indication of the yaw rate of the vehicle.


?€¢
Steering wheel position sensor (SWPS) (w/JL4)--The EBCM uses the SWPS as an indication of the position and rotation of the steering wheel.


This systems are very complex , your best bet would be to take it to a qualified repair shop .

Oct 18, 2016 | Cadillac Cars & Trucks

2 Answers

How to diagnose an ABS problem


You need to find out what code is stored in the ABS control module, if the light is on there is a DTC an the system is disabled ! Don't know if auto part stores can pull ABS codes or not , You'll have to check it out . Personally I say take it to a ASE certified repair shop if you don't know anything about anti lock brakes !
?€¢
Electronic Brake Control Module (EBCM) -- The EBCM controls the system functions and detects failures.


The EBCM contains the following components:


?€¢
System Relays -- The inlet and outlet solenoid relay is energized when the ignition is ON and no ABS DTCs are present. It supplies battery positive voltage to the solenoid valves, the pump motor relay is energized and supplies battery positive voltage to the pump motor when ABS is activated.


?€¢
Brake Pressure Modulator Valve (BPMV) -- The BPMV contains the hydraulic valves and pump motor that are controlled electrically by the EBCM. The BPMV uses a 4 circuit configuration with a diagonal split. The BPMV directs fluid from the reservoir of the master cylinder to the left front and right rear wheels and fluid from the other reservoir to the right front and left rear wheels. The diagonal circuits are hydraulically isolated so that a leak or malfunction in one circuit will allow continued braking ability on the other.


This system can store 10-12 DTC's for something simple as wheel speed sensors to wiring problems to a malfunction of the EBCM . Some of these problems you would need a professional type scan tool ! The antilock brake system on your vehicle is the
BOSCH 8.0 antilock braking system
The vehicle is equipped with the following braking systems:
?€¢
Antilock Brake System (ABS)


?€¢
Dynamic Rear Proportioning (DRP)


?€¢
Traction Control System (TCS) (w/NW7)

The following components are involved in the operation of the above systems:
?€¢
Electronic Brake Control Module (EBCM) -- The EBCM controls the system functions and detects failures.


The EBCM contains the following components:


?€¢
System Relays -- The inlet and outlet solenoid relay is energized when the ignition is ON and no ABS DTCs are present. It supplies battery positive voltage to the solenoid valves, the pump motor relay is energized and supplies battery positive voltage to the pump motor when ABS is activated.


?€¢
Brake Pressure Modulator Valve (BPMV) -- The BPMV contains the hydraulic valves and pump motor that are controlled electrically by the EBCM. The BPMV uses a 4 circuit configuration with a diagonal split. The BPMV directs fluid from the reservoir of the master cylinder to the left front and right rear wheels and fluid from the other reservoir to the right front and left rear wheels. The diagonal circuits are hydraulically isolated so that a leak or malfunction in one circuit will allow continued braking ability on the other.


Important: There is a rubber isolator located under the BPMV and on the mounting studs. The rubber isolators protect the BPMV and the EBCM from vehicle vibrations.


?€¢
The BPMV contains the following components:


-
Pump Motor


-
Inlet Valves (one per wheel)


-
Outlet Valves (one per wheel)


?€¢
Wheel Speed Sensors (WSS) -- As the wheel spins, the wheel speed sensor produces an AC signal. The EBCM uses this alternating current signal to calculate wheel speed. The wheel speed sensors are replaceable only as part of the wheel hub and bearing assemblies.


?€¢
Traction Control Switch (w/NW7) -- The TCS is manually disabled or enabled using the traction control switch.


?€¢
Stop Lamp Switch - The EBCM uses the stop lamp switch as an indication that the brake pedal is applied

Sep 21, 2015 | 2006 Saturn ION

2 Answers

Remove master cylinder


you will need the manual on this one , it has to be done right so as to not get air in thelines when completed

Jul 15, 2014 | 2006 Chrysler Pacifica

2 Answers

BRAKE LIGHT ON , BKAKES SOFT FADE. i THOUGHT REPLACING PADS AND ROTERS, BLEED ENTIRE SYSTEM. PROBLEM STILL EXIST. I'AM THINKING BOOSTER WHAT DO YOU THINK.


Brake pads, rotors, and boosters do not cause brakes to fade. They also do not cause the light to come on. Hydraulic leaks cause brakes to fade and also the light to come on. Check all of your brake lines and fittings for leaks. Check also the calipers and/or wheel cyliders for leakage. If you cannot find any external leaks and you are not losing any brake fluid, then the problem is caused by an internal leak in the master cylinder or (if you vehice is equipped with antilock brakes) the antilock control module

Mar 07, 2011 | Nissan Altima Cars & Trucks

2 Answers

My antilock brake system stopped working and my emergancy brake light is on even though the brake is down. the fluid is fine.


If the parking brake switch is not stuck and the fluid level is OK, try tapping on the fluid reservoir to see if the light flickers or goes off. (you need 2 people to do this) If it flickers or goes off then replace your fluid level sensor. (You may have to buy a complete reservoir or master cylinder depending on your car ) If this does not provide any results, then you may have an internal leak in your master cylinder or Antolock Hydraulic Control Module causing the Proportioning Sensor Switch to turn the light on. At this point. I would tow it to a shop and have the Antilock Control Module scanned to see why it has turned the light on and disabled your Antilock Brake System. I do not recommend driving the car at all until the RED brake warning lamp problem has been resolved. It is OK to operate the vehicle (cautiously) with the YELLOW Antilock brake lamp on.

Jan 16, 2011 | Pontiac Sunfire Cars & Trucks

2 Answers

What does 4 W ABS mean on the dashboard


means to have your brakes looked at abs stands for anti brakeing system check brake fluid level if it isnt that then have your brakes looked at

Dec 10, 2010 | 1999 Mazda Millenia

1 Answer

How to trouble shoot the brake system?


To trouble shoot the brake system you have to check:AntiLock Brake System ABS:
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.
Wheel Speed Sensors, brake fluid level, brake hoses and lines, inspect and replacement, Brake hydraulic system-bleeding, Brake light switch, check, adjustment and replacement.
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.

Oct 10, 2010 | 2000 Chevrolet Venture

3 Answers

Brake peddle goes to the floor intermitantly.


The problem may be that the master cylinder needs to be bench bled,there is most likely air trapped in the piston of the master cylinder.The problem comes from the piston not being fully actuated when connected to the pedal assembly.A vacuum bleeder will generally pull it out.

May 25, 2009 | 2004 Dodge Ram 2500

1 Answer

AntiLock Brakes


Probably broken wires on the sensors on your brakes, or dirty sensors. Very typical.

May 20, 2009 | 1992 Chevrolet Astro Extended

1 Answer

1991 Lincoln Towncar anti brake lock light stays on.


It's very possible you have a faulty wheel sensor. Look behind each wheel. Around the center you can see a wire harness attached. Check each wire harness for broken wires. I don't think this car has a self test to tell you which wheel has the problem. You will probably have to take it to the dealer and let them tell you.
When the antilock light comes on your cars system is telling you of a problem and also that you have standard brakes now and no antilock.
You can most probably drive normally as long as the system is staying full of brake fluid.

Apr 03, 2009 | 1991 Lincoln Town Car

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