Question about 1991 Lincoln Mark VII

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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?

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  • Lincoln Master
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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?

Posted on Jul 26, 2010

Testimonial: "Yes, I mean Caliper. Will the rear Calipers work with the lower pressure master cylinder? Thanks"

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  • Master
  • 409 Answers

Sounds like you got air in the rear brake circuit. Cars with abs can be very difficult to bleed out, try bleeding them out at the calipers.

Posted on Jul 26, 2010

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1 Answer

How do I bleed a new REAR master cylinder to the back brake on my 2001 BMW R1150R


their is an old trick. have someone help you have them pump the brake about 5 time allowing the pedal come up each time have them hold the pedal down as you loosen the brake line at the wheel cylinder the tighten it up before the pedal come up and repeat till the brake feels good,keep an eye on the mastercylinder level

Nov 08, 2014 | Cars & Trucks

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Have a 99 Toyota camry n brake light is on after changing right front brake caliper


Master cylinder fluid piston has entered into a brake safe mode.
when the high pressure brake system is opened in any way, the brake master cylinder piston reaches to the far end of the master cylinder which trips the brake system warning light.

This brake light condition is due to sudden loss of brake fluid pressure on the right front brake caliper assembly during the replacement.

Left rear brake caliper bleed valve will ned to be "opened" until master cylinder piston travels into the opposite direction which "resets" the brake system warning light.

Dot 4 brake fluid recommened for most, but not all vehicles.
Reference vehicle to owners manual for replacement fluid is replaced under master cylinder brake system cap.

Aug 18, 2013 | 1993 Buick Park Avenue

1 Answer

Replace brake booster


  • Slide the tube nut wrench over the brake line to the master cylinder connection. The master cylinder is normally on the driver's side of the engine bay and mounted on the firewall. Orient the wrench so that it fits over the tube nut on the end of the brake line.
  • 2Disconnect the brake line. Turn the nut counterclockwise to remove. Note the location of each brake line. There are four lines total, and they need to be put back in the same location when reinstalling the lines. You may want to mark them with masking tape and permanent marker.

  • 3Unplug the master cylinder cap electrical plug.
  • 4Remove the brake master cylinder to brake booster bolts with a socket wrench.
  • 5Back the master cylinder off the brake booster.
  • 6Unbolt the bolts holding the brake booster to the firewall on your vehicle.
  • 7Pull the cotter pin out of the brake pedal to brake booster connecting pin with a pair of pliers. This is done inside the vehicle down in the driver side foot well.
  • 8Pull the brake pedal to brake booster connecting pin out to disconnect the brake pedal from the brake booster connecting arm.
  • 9Mark and remove the vacuum hoses on the brake booster and slide the booster off the firewall.
  • 10Install the new brake booster. Installation is the reverse of removal
  • Aug 06, 2012 | 1998 Lincoln Mark VIII

    1 Answer

    The rear brakes on my 1996 Lincoln VIII don't work...the brake pads do not need to be replaced according to the mechanic...he did bleed the lines but the dashboard brake light is on indicating a problem...


    The light means you are low on fluid now. If your rear brakes are not working you have a master cylinder or proportioning valve problem. You may also have a leak at the rear.

    Dec 13, 2009 | 1996 Lincoln Mark VIII

    2 Answers

    Removed the master cyllinder to replace the valve cover gasket and refilled the brake reservior. need to get full pedel


    it sound as if you need to bleed the master cylinder to get the air out of the system give these websites a try www.autozone.com and www.alldatadiy.com if all fails stop by your local library and get your hands on a Haynes auto repair Manual for your car wish you the best of luck Michigan Man.

    Nov 02, 2009 | 1989 Lincoln Town Car

    2 Answers

    CAN I REPLACE AN ABS POWER BOSTER &MASTER CYLINDERWITH A NEW NON ABS PAIRON MY 88 LSC


    yes you can using a brake booster and master cylinder from a 1984-86.5 Mustang SVO Try searching some of the lincoln forums

    Jun 25, 2009 | 1988 Lincoln Mark VII

    2 Answers

    Brake line diagram


    Brake Lines and Hoses
    Double-walled steel line is used in the hydraulic lines between the brake master cylinder and the front tube connector, and between the brake master cylinder and the flexible brake hose at the rear wheels.
    Double-flared brake lines provide good leak-proof connections.
    When replacing hydraulic brake lines, hoses, or connectors, tighten all connections securely. After replacement, bleed the brake system; refer to Section 206-00 .
    The wet appearance of the outer cover of the rubber brake hose is referred to as "sweating." This is a normal condition for neoprene rayon braid hose and is not a sign of leakage or cause for replacement of the hose.

    Hydraulic Brake System Components — Non-ABS

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    Item Part Number Description 1 2005 Power Brake Booster 2 2455 Brake Pedal 3 2261 Rear Wheel Cylinder 4 2552 Rear Disc Brake Caliper— (Mexico Only) 5 2B120 Disc Brake Caliper—, Front 6 2B091 Brake Pressure Control Valves 7 2140 Brake Master Cylinder

    May 02, 2009 | 1998 Mercury Tracer

    1 Answer

    1988 Lincoln TC message center says "Brake Pressure"


    If the pedal keeps dropping the master cylinder is probably going bad (most common). Another tip is the rear brake pads hold the pedal height. Check your rear pads to see if they are low or need replacing. Most brake shops do a free inspection so I would let them do the leg work for you. Go to a reputable shop or if unsure get multiple estimates before performing the work

    Apr 13, 2009 | 2003 Audi TT

    2 Answers

    I need to know how to bleed the brakes on a 1999 chevy blazer


    Start from right rear, then, left rear, right front, left front. Fill master cylinder. Have helper sit in car, have helper hold brake pedal down. open bleed screw. fluid and air comes out. close screw. release brake pedal. Continue until no air comes out. Move to next wheel. Keep an eye on master cylinder fluid level after each wheel.

    Mar 27, 2009 | 1999 Chevrolet Blazer

    3 Answers

    Rear brake problems in 1990 lincoln mark 7


    my first guess at that would be you have a air bubble it the master cylinder. have you left something out like a repair you just performed or something ?

    sound like air anyhow or a bad master cylinder.

    what to try is this fill up the brake reservoir and open both rear bleeders

    walk away for a few hours or put a pan to catch fluid and go to bed

    this should start a gravity bleed on the brakes brake, fluid level should be lower in the morning if not empty lol.

    have someone pump the brakes hold the pedal down on the last pump and while they hold the pedal down crack the bleeder, ( he must keep pedal on the floor till you tighten the bleeder back up

    then he can let up on the pedal and y'all do this again and again till while he hold the pedal down and you open the bleeder, you have no momre air coming out. good luck

    Jan 27, 2009 | 1992 Lincoln Mark VII

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