Low Speed Braking Issue
Thread Starter
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Cross-Country
Joined: Dec 2017
Posts: 95
Likes: 2
From: Conowingo, Maryland
Low Speed Braking Issue
I'm back! I have a 2001 Ford F-250 4x4. Recently when I am braking at a stop sign, literally right before I am at a complete stop the truck will turn hard right. Its almost like one of the front brakes loses all braking power. If I keep the brake pedal down I can feel a pulsing in the pedal. Seems like if I pump the brake once before stopping it won't do it. I bled all the brakes last night and it did not fix the problem. Any ideas what might be causing this?
Thanks, Steve
Thanks, Steve
Thread Starter
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Cross-Country
Joined: Dec 2017
Posts: 95
Likes: 2
From: Conowingo, Maryland
I will take a look today. I had a feeling that the pulsing in the pedal was the abs kicking in. Why would it only do that 5 feet from when I come to a complete stop? Thanks
4wd Low
Joined: Oct 2019
Posts: 10
Likes: 2
This is a very common complaint. Your ABS is acting correctly. It thinks there is a traction condition in the left ft. wheel while braking. The controller is pulsing the l.f. hydraulic circuit ( you feel it in the pedal). The rt. ft. is pressurizing correctly and the veh. pulls to the rt. Typically a tone wheel is broken or chipped, the wiring from the sensor to the controller is damaged or the sensor is bad. Access to a scanner makes diag. much easier but sometimes you can visually scrutinize the area and find it.
Thread Starter
|
Cross-Country
Joined: Dec 2017
Posts: 95
Likes: 2
From: Conowingo, Maryland
This is a very common complaint. Your ABS is acting correctly. It thinks there is a traction condition in the left ft. wheel while braking. The controller is pulsing the l.f. hydraulic circuit ( you feel it in the pedal). The rt. ft. is pressurizing correctly and the veh. pulls to the rt. Typically a tone wheel is broken or chipped, the wiring from the sensor to the controller is damaged or the sensor is bad. Access to a scanner makes diag. much easier but sometimes you can visually scrutinize the area and find it.
4wd Low
Joined: Oct 2019
Posts: 10
Likes: 2
A scanner that will graph live data is the best tool. All wheel speed channels can be monitored at the same time. Slow speed driving (parking lot, empty) is safest location. Just tool around watching the scanner and wait for the condition, it will be apparent which wheel has the issue. From there on it's process of elimination, jack up axle so wheel can be spun by hand and see if moving the harness etc. will change things.
Thread Starter
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Cross-Country
Joined: Dec 2017
Posts: 95
Likes: 2
From: Conowingo, Maryland
A scanner that will graph live data is the best tool. All wheel speed channels can be monitored at the same time. Slow speed driving (parking lot, empty) is safest location. Just tool around watching the scanner and wait for the condition, it will be apparent which wheel has the issue. From there on it's process of elimination, jack up axle so wheel can be spun by hand and see if moving the harness etc. will change things.
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Cross-Country
Joined: Dec 2017
Posts: 95
Likes: 2
From: Conowingo, Maryland
Just an update for you guys. It turned out that the ABS sensor cable to the right front wheel was rubbing the rotor and had several places where wires were exposed. The scan showed a short. I am going to order the new sensor and hopefully that will solve the problem. Thanks for all the assistance. You guys are great as usual.
Steve
Steve
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Hotshot
Joined: Dec 2014
Posts: 17,829
Likes: 3,114
From: Jersey Shore
As galaxy pointed out, and stbird resolved, the issue was ABS not slide pins. Slide pin issues can alter the temperature balance side to side and produce a higher coefficient of friction on one side, but it will not the hard turn and pulsing.
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