Question about 1993 Ford F250

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Rear abs brakes wont release when applied hard .I replaced the controll module.

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May need to replace either the wheel cylinders,and or the rubber brake hose,it may be collapsing on the inside where you cannot see it.

Posted on Jul 27, 2009

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What is a abs modular on a Escalade Cadillac?


Jesse, The module will not stop fluid to rear brakes, a bad master cylinder will,leaking lines, air in brake system, faulty metering block if equipped, collapsed flex lines or pinched brake line faulty caliper or brake cylinders,etc. will cause the possible feeling of no rear brakes.
(ABS Module components) the ABS speed sensors and the ABS control module . When the brake is applied, the ABS control module reads the speed data from the speed sensor and sends the correct pressure to each wheel to prevent any wheel lock up, eg. sliding/skidding Links below have more info.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

Service Stability System AND abs Pump issue

ABS Control Module Replacement Service Cost YourMechanic

https://www.rockauto.com/en/catalog/cadillac,2002,escalade,5.3l+v8,1431695,brake/wheel+hub,abs+control+module,1844

Feb 24, 2016 | Cars & Trucks

2 Answers

Why does my ABS light stays on and sometimes i get a vibration in the brake petal causing my 2002 Cadillac escalade not wanting to stop?


Sounds like a fault with the Antilock Braking System. The vibration in the pedal is the ABS working. With your foot on the brake pedal, it releases and re-applies the brakes to stop a skid from the wheels locking up. You need professional service for brakes.

Seems to be a known issue on all Cadillac and requires the ABS module to be replaced.

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repairpal.com > Problems > Cadillac > Seville SLS ABS Light Due to Control Module Failure on Cadillac Seville SLS. The anti-lock brake ... SLS135,000Jumsee. Abs and traction lights stay on when started.

Jan 12, 2016 | Cadillac Cars & Trucks

1 Answer

Abs light come up


WHEN THE CONTROL MODULE TURNED THIS WARNING LAMP ON IT WAS TO ALERT YOU TO THE FACT A FAULT HAS OCCURRED IN THE abs BRAKE SYSTE, AND THE MODULE HAS DISABLED IT. WHAT NEEDS TO BE DONE NOW IS TO HAVE THE DEALER PERFROM A SCAN OF THE SYSTEMS CONTROL MODULE AND PULL UP THE FAULT CODE THAT IS STORED IN MEMORY WHENTHE LIGHT TURNED ON.

Jun 18, 2012 | 2004 Toyota Sienna

1 Answer

The left rear wheel is locked up


This can be caused by a defective anti lock brake system ABS for short, this year has active ABS, this means the system can apply hydraulic pressure to the brakes with the driver never touching the brake pedal, if the valve that controls this pressure to the wheel leaks or sticks the brakes will lock up. To confirm this release pressure at the wheel by opening the brake caliper bleeder valve at the top of the brake caliper with the engine off. If the wheel spins free after the pressure is released you will need the ABS checked and quite possibly a new ABS hydraulic control unit. This type of failure is very rare but it does happen

Jan 16, 2012 | 2003 Dodge Caravan

1 Answer

I am working on a 2004 dodge caravan with a soft brake problem.i have replaced the rear shoes and adjusted rear brakes,also replaced front rotors and pads.i have also replaced the master cylinder.after...


try bleeding the master cylinder at the lines first as it indicates that there is still air in the pistons
loosen one line at a time and gently apply the brakes until any air bubbles come out tighten the line before releasing the brake pedal
do it for the other line and then bleed all the brakes starting at the longest line first and ending at the shortest line

Apr 23, 2017 | Dodge Challenger Cars & Trucks

2 Answers

I replaced the brake master cylinder on my 91 Lincoln Mark 7 with a non high pressure master cylinder and the rear brakes do not hold. Do I need to change the cal. on the rear also?


ANTI-LOCK BRAKE SYSTEM (and HCU-Hydraulic Control Unit)
General Information The 4-Wheel Anti-lock Brake System (ABS) is an electronically operated, all wheel brake control system. Major components include the power brake booster, master cylinder, the wheel speed sensors, and the Hydraulic Control Unit (HCU) which contains the control module, a relay, and the pressure control valves. The system is designed to ****** wheel lockup during periods of high wheel slip when braking. Retarding wheel lockup is accomplished by modulating fluid pressure to the wheel brake units. When the control module detects a variation in voltage across the wheel speed sensors, the ABS is activated. The control module opens and closes various valves located inside the HCU. These valves, called dump and isolation valves, modulate the hydraulic pressure to the wheels by applying and venting the pressure to the brake fluid circuits. Some models are equipped with a Traction Assist (TA) system. The TA system senses wheel spin upon acceleration, turns on the Hydraulic Control Unit (HCU) pump and applies fluid pressure to the appropriate rear wheel. Two additional isolation valves in the HCU will also close to permit fluid to flow only to the rear wheels. The TA system monitors TA usage to avoid overheating the rear brakes. If the system does sense brake overheating, the ABS module will inhibit TA operation until the rear brakes are permitted to cool down.
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SYSTEM COMPONENTS The anti-lock brake system consists of the following components:
  • Vacuum booster and master cylinder assembly
  • Hydraulic Control Unit (HCU)
  • ABS module
  • Wheel sensors
  • Pedal travel switch
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On 1992-1994 and 1995-00 a scanner is used to perform the brake bleed. But on yours, I think it's different according to the manual.
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What do you mean change the cal. on the rear also? Do you mean Caliper?

Jul 26, 2010 | 1991 Lincoln Mark VII

2 Answers

What is abs how it function


ABS is anti-lock braking system. It is a range of four sensors which monitor the braking capability when you apply the brakes. If you are harsh and stamp on the brake pedal there is a risk of the wheels locking up and sliding (screeching from the tires).

The ABS sensors modulate the brake caliper pistons andapply and let go the brakes very quickly. This stops the tires from skidding and you will feel a pulse through the brake pedal as the hydraulic system is forced to release the pedal slightly for a fraction of a second.

As ABS stops your car from skidding it allows you to turn the steering when you are braking hard. This is good news for avoiding accidents. If you lock the wheels on a non ABS car, you continue in the direction of the wheels - unless you release the brakes and reapply quickly (same method as ABS) this is called cadence braking but when involved with a potential accident the last thing on people's minds is to release the brake pedal. Having only owned older cars, cadence braking is one method I've learned, especially from driving in the snow.

I hope this helps you and please vote for me :)

Jul 16, 2010 | 2005 Toyota ECHO

1 Answer

My abs and handbrake light stay on every two days and off after in my honda civic 1500cc yr 2004.its a five door civic


This indicates you have an issue with your ABS control unit. ABS is a system that "pumps" the brakes in rapid succession to prevent wheel lockup during an emergency start. A common cause of sliding in wet weather, etc. To do this a computer control module uses plungers to open and close the brake fluid flow to the brake in miliseconds..so while you are pressing on brake pedal hard... the system is actually applying and releasing the brake in rapid succession (miliseconds) to prevent skid, etc. When teh computer module goes bad the ABS and Parking brake light will stay illuminated. There shoudl be an ABS fuse in your vehicle (please refer to your manual) that can be removed. Remove this fuse and check it for dirt, blown, cracks, or corosion. Replace the fuse and listen with the motor off if you hear a hum noise this would indicate the motor is running continuously for the brakes and is another indicator of a bad control. With the fuse removed both lights should stay continuously lit. If the motor is running continuously this can blow the ABS motor.. your brake system will still function with the fuse removed, but test it with a slow roll (no gas hand pushed car) The ABS controller is quite pricey to replace in the vehicle and should be referred to a licensed facility such as a dealer. YES dealers are high but to have this job done properly you need to have the vehicle raised on a platform. Your local brake shop, muffler shop, shadetree wont be able to do this control repair properly.

Jun 11, 2010 | 2004 Honda Civic

2 Answers

Here is a Problem for you all! 2000 Grand Am GT ram air v6 ABS and Brake light always on, No trouble codes, and no rear brakes at all key on or off. Has fluid at M/C and to ABS unit but not from unit to...


This problem sounds like and ABS module that has gone bad, the ABS module has toothed gears inside that actuate the ABS motor, if one of these gears slips a tooth or "unwinds" itself if will not circulate brake fluid to where it needs to go (ex: the rear brakes) alot of times the brake and ABS light will come on, but will not set any trouble codes. My recommendation is to take this to a repair shop and have them verify the problem and replace the ABS module, the motor gears have to be properly aligned when replacing or the lights will stay on and you will still have the same problem. Hope this helps.

Mar 10, 2009 | 2000 Pontiac Grand Am GT

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