Question about 2001 Chevrolet Blazer

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When I apply the brake (especially when appling the break at low speed and during the last ten MPH of decelerstion )It feels like my ABS system is locking up. I have difficulty stopping and sometimes it takes an extra 10 to 20 feet to stop. No check engine ligh has come on .Took the fuse out of ABS and brakes worked fine but no ABS. How can I tell which front sensor is bad if thats what it is?

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Put the fuse back in and take it for a drive in a secluded area. When the anti lock kicks in at low speed let go of the steering wheel and see which way it turns the wheel.. ie: if the steering whell goes left it is the right sensor. you can remove the sensor and file down the rust at it's mounting point to put the sensor back to it's proper gap to the reluctor wheel in the bearing and it may cure it but for the price of a bearing you may be better of to replace it.
Hope this helps , if you need anymore info on how to do it just ask.

Posted on Jul 28, 2010

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ABS CHECK LIGHT DOESNT COME ON WHEN YOU TURN KEY ON


1. I would not be concerned because if there was a failure in the ABS you would definitely get an ABS warning light and the ABS and most likely the stability control/traction control systems (with added warning lights) will all switch off .

2. You can test if the ABS is operational. On a very quiet damp surface, straight, wide road( with NO other cars around), apply your brakes hard from a very low speed - up to 20 mph ONLY driving in a straight line - until the car stops. The front brakes should attempt to lock up under hard braking and if the ABS is operational you will feel it kick in and the brake pedal will pulsate as the ABS constantly allows brake pressure and then releases it to prevent the wheels from locking up on the damp road. If the ABS does not kick in be ready to release the brake pedal quickly to allow the wheels to rotate so you can steer the car safely. Without the ABS the front wheels should begin to lock up on the damp road surface due to the low level of tire grip. ONLY test this at very low speed and ONLY when driving in a straight line on a straight section of wide road with no other vehicles around.

Dec 15, 2015 | Cars & Trucks

2 Answers

Brake chatter


If you hear the moan of the abs pump that you have a condition known as overactive abs. Especial if you feel it kick in under 5mph. What is happening is a signal from a wheel speed sensor is dropping out at slow speeds fooling the abs module into thinking the wheel has locked up. The abs module responds by activating the abs system in order to unlock the wheel. If you don't hear the moan of the abs pump than you have either a warped rotor. If you feel it more in the steering wheel than its the fronts that are warped. If you feel it more in the seat of the car than its the rears that are warped. It make no difference when parts where replaced. If the wheels are not properly torqued or the hubs are rusty than a rotor will warp in a heartbeat! Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

Feb 01, 2012 | 2007 Toyota Avalon

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I have a 2002 sierra gmc 4 x 4, when I come to a rolling stop the break peddle gets hard and you hear the abs working but it not stop you feel the pulse without the break or abs light coming on. I can...


This is a common problem with these trucks. You will need to set-up an appointment with the service Dept. at the dealership. There is an update for the ABS system. The function of this update is to reduce the sensitivity. When you get down to five MPH (with the brake applied) the ABS turns on (no light on dash) and you get the sensation of Sliding (braking is reduced).
This is assuming that the tires are the same size and pressure, And that there are no defects in the wheel speed sensors. Good-luck and please let me know what you decided to do and how it went.

May 15, 2010 | 2002 GMC Sierra

1 Answer

I have a 2000 GMC Yukon XL 1500. The antilock braked engage when slow to about 5 to 8 mph.


Here is a copy of a GM bulletin that applies to you concerns of low speed ABS activation.

Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface) #03-05-25-007 - (09/29/2003)
Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface)

1999-2004 GMC Yukon XL

Condition:
Some customers may comment on ABS activation at low speeds, usually below 8 km/h (5 mph). Upon investigation, the technician will find no DTCs set.

Cause
The cause of this condition may be an increased air gap between the wheel speed sensor and the hub reluctor ring due to rust and debris built up on the sensor mounting surface.

Correction
Measure AC voltage and clean the wheel speed sensor mounting surfaces.

Raise and support the vehicle.
Disconnect both the front wheel speed sensor (WSS) connectors at the frame and harness.
Place a Digital Volt Meter (DVM) across the terminals of each WSS connector.
Rotate the wheel clockwise approximately one revolution per second. The minimum reading should be at least 350 ACmV's. If the reading is less than 350 ACmV's, remove the wheel speed sensor. Refer to the applicable Wheel Speed Sensor Replacement procedure in the ABS sub-section of the Service Manual. Plug the WSS bore in order to prevent debris from falling into the hub during service.
Clean the WSS mounting surface on the hub to remove any rust or corrosion using a wire brush, or equivalent.

Important
Make sure that the sensor sits flat on the hub. Check the sensor flange against a straight edge to ensure flatness. If the sensor flange is distorted, replace the sensor.

Apply a thin layer of bearing grease to the hub surface and sensor O-ring prior to sensor installation. Use ONLY Wheel Bearing Lubricant, P/N 01051344.
Install either the original sensor or a new one in the hub. Ensure that the sensor is seated flush against the hub. Refer to the applicable Wheel Speed Sensor Replacement procedure in the ABS sub-section of the Service Manual.
Place the DVM across the sensor terminals and recheck the voltage while rotating the wheel. The voltage should now read at least 350 ACmV's.

Good luck and thank you for using Fixya.

Mar 09, 2010 | 2000 GMC Yukon XL

2 Answers

60% of the time when applying the brakes the abs system kicks in and makes the weird noise and hinders braking


A shop will need to check the wheel speed sensors, maybe one is reading "0" and the ABS thinks the wheel is locking up, when its not.

Oct 21, 2009 | 2002 Oldsmobile Silhouette

1 Answer

1997 Saab 9000 weird ABS problems: 1. Occasionally, the ABS instrument panel light will come on without the brakes being applied and the ABS system being activated. 2. Sometimes, even though the brakes are...


have car scanned auto zone -advanced auto and some other auto stores will do this for free most likely one of your sensors is starting to go bad usually will activate at low speed under 10 mph as ur slowing down do check this problem early as abs can cause vehicle to stop longer

Oct 05, 2009 | 1991 Saab 9000

3 Answers

My car shakes after applying brakes at high speeds of 60 to 70 MPH on my 2001 / IS300 lexus. I recently had the rotors turned and put on new break pads before this problem really became noticable. I...


Well even though you had the rotors turned, they still could be warped and causing the car to shake at a high rate of speed when the brakes are applied. My suggestion is to replace the rotors asap.

Apr 20, 2009 | 2001 Lexus IS 300

2 Answers

Abs light is on


There is a problem in the Antilock brake system and it has shut the ABS down. You will still have normal brakes just no ABS.

The 4WABS is self-monitoring. When the ignition switch is placed in the RUN position, the ABS module carries out a preliminary self-check on the anti-lock electrical system indicated by a 3-second illumination of the yellow ABS warning indicator in the instrument cluster.
If the vehicle is over 10,000 GVW, the warning indicator may remain on until the vehicle is driven at a speed above 15 mph for 10 seconds. Bringing the vehicle up to this speed enables a system self-check that turns the indicator off if no fault conditions are present.
A self-test of the solenoid valve coils and the pump motor is carried out when the vehicle is started. During starting, the brake pedal must be released to run the self-test. If the brake pedal is applied or a failed brake switch occurs, the self-test is run at 4 mph regardless of brake pedal position.
The system has 3 speed sensors,one on each front wheel and one in the rear end housing. The one in the rear end housing usually causes the problem.If any metal savings from the rear end gets on the end of it, this will cause this.
Best way to tell though is to have someone with a scan tool that will communicate with the ABS system pull the trouble codes.

Mar 20, 2009 | 2002 Ford F250 Super Duty SuperCab

1 Answer

Anti lock brakes activation


if abs activates when it should not,,, it means abs module senses one or more wheel sensores under 3 mph and the other sensores are above 3 mph. .the cause of this is usualy a bad wheel speed sensor or excessive air gap between the sensor and ringwheel. you need an abs data scanner to hook up and go for a test drive to find out which sensor is the culprit.

Jan 29, 2009 | 1991 Chevrolet Corvette

1 Answer

Brakes


This seems like two different vehicles with two different problems. first the 1997 Ford Explorer- with new rotors and pad. I can almost guaranty that the rotor and pads that were replace are "after market" parts. If it is true,then the brake pad are at fault 95% of the time, the other 5% is the rotor. This because alot of after market parts are alot cheaper and are poorly manufactured out of cheap materials. I would recommend Motor-craft rotors and pads for this vehicle and that would take care of this problem. However if it is original parts on the car the dust shield on the hub may be to blamed, may have gotten bent into rotor during brake job. As far as ABS re-learn braking pattern that all BS that's absolutely 100% NOT TRUE. I am ASE certified in brakes and I never heard of such nonsense. As for the 1999 Explorer this problem is the ABS system applying it self prematurely. The sound that you feel on the pedal is when the ABS is active. Most common reason for this is a bad abs/wheel speed sensor, it could have gotten damaged during the brake job or grease or rust or something is between the sensor and sensor gear/ring. I have seen this many times before, just re-check everything. The abs becomes active because it detects a slip or brakes locking up or in your case maybe a false reading from sensor. Good luck and contact me if you need more help

Dec 17, 2008 | 1999 Ford Explorer

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