Question about 1989 Lincoln Mark VII

1 Answer

Hcu 1989 mkvll

Where i can purchase hcu 1989 mkvll new or use ?

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 467 Answers

Check ebay or your near by salvage yard

Posted on Jul 31, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Where is the ECU on my Van with 4 wheel ABS system.


ecu is usually located under hood driver side fender

Oct 31, 2014 | Cars & Trucks

1 Answer

1994 buick lesabre new master cylinder abs light on


Look for a bleeder on ABS HCU unit- the one with brake tubing

Drive it & then Bleed again

Have to hear the abs pump come on,check fuse for it

If that doesn't work may have to open the
hcu with an obd1 scan tool & bleed

Feb 01, 2013 | 1994 Buick LeSabre

1 Answer

1993 dodge dakota air in brake lines not getting to wheel cylinder


That is not possible, if you open the bleeder valves
& flush it thru & bleed in proper manner

Have to either bleed or remove & bypass the old rusted
hcu unit on left inside frame rail also.

If you remove it- unplug the module under dash
behind glove box

Jan 23, 2013 | 1993 Dodge Dakota

1 Answer

Need to know what HCU and ECU stand for


from where are u getting "hcu" & "ecu"

Apr 03, 2012 | 2003 Ford Escape

1 Answer

How do to replace the abs control module?


If you are talking about just replacing the electronic ABS module (EBCM), it simply unplugs and unscrews from the hydraulic control unit. If you are talking about replacing the hydraulic control unit (HCU) then you must disconnect the EBCM. Disconnect all of the brake lines from the HCU. Remove the mounting bolts from the HCU and remove HCU from vehicle. Then you reverse th order to reinstall. Once it is installed you must use a scan tool to perform automated bleeding to get all the air out of the hydraulic unit and the rest of the brake system.

Feb 21, 2011 | 2006 Chevrolet Trailblazer

1 Answer

2005 jeep grand cheroke limited with A hemi, been to the dealer more times then I can count, and still to this day the same problem. The service elect brake system light illuminates intermit and so for...


The braking force of the rear wheels is controlled by electronic brake distribution (EBD). The EBD functions like a rear proportioning valve. The EBD system uses the ABS system to control the slip of the rear wheels in partial braking range. The braking force of the rear wheels is controlled electronically by using the inlet and outlet valves located in the HCU. The HCU is a Hydraulic control unit. The HCU consists of a valve body, pump motor, and wire harness.

Did they check for DTC (diagnostic trouble codes) in the system? if so, what were they?

Accumulators in the valve body store extra fluid released to the system for ABS mode operation. The pump is used to clear the accumulator of brake fluid and is operated by a DC type motor. The motor is controlled by the ABM.
The valves modulate brake pressure during antilock braking and are controlled by the ABM.
The HCU provides four channel pressure control individually to all the front and rear brakes. Each of the four channels control the rear & front wheel brakes individually.
During antilock braking, the solenoid valves are opened and closed as needed. The valves are not static. They are cycled rapidly and continuously to modulate pressure and control wheel slip and deceleration.
During normal braking, the HCU solenoid valves and pump are not activated. The master cylinder and power booster operate the same as a vehicle without an ABS brake system.
During antilock braking, solenoid valve pressure modulation occurs in three stages, pressure increase, pressure hold, and pressure decrease. The valves are all contained in the valve body portion of the HCU.


PRESSURE DECREASE The outlet valve is opened and the inlet valve is closed during the pressure decrease cycle.
A pressure decrease cycle is initiated when speed sensor signals indicate high wheel slip at one or more wheels. At this point, the ABM closes the inlet then opens the outlet valve, which also opens the return circuit to the accumulators. Fluid pressure is allowed to bleed off (decrease) as needed to prevent wheel lock.
Once the period of high wheel slip has ended, the ABM closes the outlet valve and begins a pressure increase or hold cycle as needed.


PRESSURE HOLD Both solenoid valves are closed in the pressure hold cycle. Fluid apply pressure in the control channel is maintained at a constant rate. The ABM maintains the hold cycle until sensor inputs indicate a pressure change is necessary.


PRESSURE INCREASE The inlet valve is open and the outlet valve is closed during the pressure increase cycle. The pressure increase cycle is used to counteract unequal wheel speeds. This cycle controls re-application of fluid apply pressure due to changing road surfaces or wheel speed.

Nov 09, 2010 | 2005 Jeep Grand Cherokee

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.
---
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
---
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.
---
What do you mean change the cal. on the rear also? Do you mean Caliper?

Jul 26, 2010 | 1991 Lincoln Mark VII

1 Answer

ABS indicator remains on


remove the brake lines and HCU. unplug the modual and istall new modual. if ou havn't had the van checked out, i would, there are a number of things it could be that are alot cheaper than a new modual. could just be a wheel speed sensor.

May 19, 2009 | 2001 Ford Windstar

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

56 people viewed this question

Ask a Question

Usually answered in minutes!

Top Lincoln Experts

yadayada
yadayada

Level 3 Expert

76649 Answers

fordexpert

Level 3 Expert

5537 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Are you a Lincoln Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...