All four brakes locked up on my 2004 gmc sierra, upon further inspection i noticed that the wires to my front left abs sensor was cut. I fixed the wires drove about 15 miles and they locked up again. I then pulled the fuse to the abs, let the rotors cool down again, and drove another 10 miles with no problems. I reinstalled the abs fuse and drove the remaining 15 miles home with no issues. I'm assuming i have an issue with the master cylnder, but i was wondering if anybody has had similar issues or knows of a possible solution. Thanks in advance for all the help.
Similar problem on a Toyota truck. Turned out to be a combination of items.
Bad valve in the master cylinder.
Contaminated brake fluid.
Basically the heat in the rotors was boiling the brake fluid cause it to expand and lock up the brakes.
Not sure if the fluid contamination was caused by the master cylinder or the other way around. (it is the whole chicken or the egg argument.
My recommendation is start at the right rear wheel. Drain the fluid until it is at the bottom of the reservoir. refill with new fluid. Bleed the entire system. working your way around the truck from longest run to shortest. (Distance from master to the wheel)
Take your time and don't rush the job. After you have flushed and bled the system, go for a check ride. If the condition continues, you likely have the defective seal in the master cylinder.
Good luck, let me know if you need any other info.
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Sounds like you are losing wheel speed signal when under hard turns. This is commonly caused by the harness at or near the wheel speed sensor has a bad connection of there may be a break in the wiring that intermittently loses signal to the ABS module and causes the anti-lock function to happen, (loss of wheel speed is like wheel skid as far as the ABS module is concerned) It is usually necessary to have a scan tool to monitor the data and read codes on the ABS system. You may have to take vehicle to shop that is capable of diagnosing the problem.
There was a TSB on this issue with your Sierra, a faulty or dirty ABS sensor is the cause of this problem. The fix is simple, just clean the ABS sensor at the front hub with brake parts cleaner and inspect the wire leads. At worst you may have to replace the sensor it self. Good luck
There was a recall on the ABS system on your truck. The problem was the ABS sensor on the front wheels were getting dirty and corroded causing a faults signal to the ABS module. The fix was to inspect the ABS sensor and clean them with brake parts cleaner and re-gap the sensor to the speed ring on the hub. The ABS sensor and speed ring is on the inside of the front wheel hub, spry brake parts cleaner and re-gap the sensor to the speed ring with paper folded 5 times. I feeler gauge will work but put a paper between the sensor and gauge cause the sensor is magnetic and the gauge will stick. Look for damages to the lead wire to the abs, but i think that's all fine since you did not mentioned any abs light on. You may be even lucky with just a good spray of the brake parts cleaner. Good luck and keep me posted.
The flex hose to that caliper has deteriorated and collapsed. You need to change both front flex hoes immediately! Once the hoses get to this stage they can blow under heavy braking and leave you with no brakes.
did you check the alb sensor? You might also have the "return spring" stuck in the emergency brakes. Sometimes they break causing the brake to lock, which in turn activates the alb. Also, check the brake oil level, in some cars alb dont work properely if the oil level is too low. Good Luck
I own the 2002 Buick Rendezvous CX and I've encountered the same problems listed here. The ABS / Traction Control Lamp stays on and was throwing a code for the left wheel speed sensor as well as an anti-lock brake code (both in the wheel bearing hub assembly). I replaced the left and right front wheel hub assembly yet this did not eliminate the abs codes.
Ultimately, I traced this problem to a break in the wire that leads to the left hub assembly. Although the sensor was properly connected, the wire (which is encased in a plastic housing) was broken. This is the wiring which leads from the abs wiring harness under the hood down to the left wheel abs sensor.
I would suggest that you simply remove the left wheel and inspect the wire that leads to the abs sensor (there is only one wire on each wheel). Mine literally fell apart when I removed the plastic housing around the wire. I spliced the wire together and put it back in the plastic housing. After this, my abs codes disappeared and my anti-lock brakes began working again!
This is a simple fix that many people spend $1000 + on by replacing the hub assembly which does not fix the problem.