Question about 1990 Ford Thunderbird

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I need help with fixing my step-daughters brakes on her 1990 Ford Thunderbird. I have the Cilton's manual, and it tells you the steps to bleed air from the master cylinder, but doesn't show what to loosen to get the air out. Also, How can I tell if the vacuum assist is damaged from a leaky real seal on the master cylinder?

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Each Wheel cylinder has a small bleed port at the back of each wheel, towards the top. it should be a 5/16 wrench needed

Posted on Oct 26, 2009

Testimonial: "This helped a bit. It turned out the maser cylinder was fouled with junk from a past owner mixing petroleum and silicone based fluids. I replaced the cylinder, and this suggestion helped me with the bleed of the new cylinder."

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If the vacum assist is bad you will here a loud hissing and the engine will idol very high and rough as far as the brakes behind each tire on the caliper is a bleeder screw you open it have someone push the pedal to the floor and hold it till you close it repeat that several times till you see no air and then move on to the next tire

Posted on Jul 24, 2009

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1990 jeep wrangler bleeding breaks


Hi there:
I suggest to check this procedure, when the hydraulic brake system must be bled whenever a fluid line has been disconnected because air gets into the system.

A leak in the system may sometimes be indicated by a spongy brake pedal. Air trapped in the system is compressible and does not permit the pressure applied to the brake pedal to be transmitted solidly through the brakes. The system must be absolutely free from air at all times. If the master cylinder has been overhauled or a new cylinder has been installed, bleed the cylinder on a bench before installation. When bleeding brakes, bleed at the wheel most distant from the master cylinder first, the next most distant second, and so on. During the bleeding operation the master cylinder must be kept at least 3 / 4 full of brake fluid.


The ABS bleeding procedure is different from the conventional method. It consists of the following three steps:
Step 1: Conventional manual brake bleed.
Step 2: Bleeding the system using the DRB scan tool.
Step 3: An additional conventional manual brake bleed.

The recommended ABS bleeding procedure is as follows:
  1. To bleed the brakes, first carefully clean all dirt from around the master cylinder filler cap. Remove the filler cap and fill the master cylinder with DOT 3 brake fluid to the lower edge of the filler neck.
  2. Bleed the master cylinder first. Have a helper operate the brake pedal while bleeding each master cylinder fluid outlet line. Do not allow the master cylinder to to run out of fluid,as this will allow additional air to be drawn into the cylinder.
  3. Bleed the brake system in the following sequence:
    1. Master cylinder
    2. HCU valve body (at fluid lines)
    3. Right rear wheel
    4. Left rear wheel
    5. Right front wheel
    6. Left front wheel
  4. Clean off the bleeder connections at all four wheel cylinders. Attach the bleeder hose to the right rear wheel cylinder bleeder screw and place the end of the tube in a glass jar, submerged in brake fluid.
  5. Open the bleeder valve 1/2 - 3/4 of a turn.
  6. Have an assistant depress the brake pedal slowly and allow it to return. Continue this pumping action to force any air out of the system. When bubbles cease to appear at the end of the bleeder hose, close the bleeder valve and remove the hose.
  7. Check the level of fluid in the master cylinder reservoir and replenish as necessary.
  8. After the bleeding operation at each wheel cylinder has been completed, fill the master cylinder reservoir and replace the filler plug.

Do not reuse the fluid which has been removed from the lines through the bleeding process because it contains air bubbles and dirt.


  1. Perform the "Bleed Brake'' procedure with the DRB II scan tool. This procedure is described in the DRB II software information and diagnostic guide.
    1. Attach the DRB II scan tool to the diagnostic connector.
    2. Run the Bleed Brake procedure as described in the DRB II tester guide.
  2. Repeat the conventional bleeding procedure as previously outlined.
  3. Fill the master cylinder reservoir to the proper level.
  4. Check the brake operation.


Hope this helps.

Apr 21, 2013 | Jeep Wrangler Cars & Trucks

1 Answer

What are the steps to bleding the air from the coolint?


leave cap off as car runs add fluid as needed til full you will see bubbles coming out the radiator as you fill

Dec 05, 2012 | 1990 Ford Thunderbird

1 Answer

Is there air in my ABS of my '92 thunderbird lx?


ABS isn't so much a thing as a system, but if you want to know how to bleed your brake system you place a tranparent tube on one of the brake cylinder valves/nipples, then imerse the end of the tube in a small bottle with some brake fluid in. Then you get someone to press the pedal down slowly as you open the valve/nipple. They should pump a few times slowly, then with the pedal down close the valve/nipple. Check to see if the pedal is harder. You should do this with both front and rear brakes, as they are seperate lines. The ABS is a system that ballances the brakes to stop slewing across the road when you apply the pedal too hard. The part attached to the master cylinder is actually a servo, which should have a tube go from it to the inlet manifold of the engine. This causes a vacuum in the servo, which when applying the brakes helps the brakes by taking away some of the pressure needed. If this pipe is broken or not connected, then your sevo won't work. There is an easy way to check your servo. Press the pedal down, then start the engine, you should feel the pedal go down a bit more. If it does not, check the servo tube.

May 20, 2012 | 1992 Ford Thunderbird

1 Answer

How do you remove a 1990 ford thunderbird steering wheel?


There will be screws/bolts around the outside(under some kind of covers), holding the center section on. after you get that off there will be one nut right in the center(remove that and pull the steering wheel(most of the time you need a steering wheel puller)

Feb 29, 2012 | 1990 Ford Thunderbird

1 Answer

How to change a master cylinder


a Master rates about a 5 out of 10 with 10 being the hardest

you may find the hardest part is the actual bench bleeding of the master
and/or
the replacement of the reservoir

These are the instructions from my service manual, but I do not remove the fluid prior to service steps 2-6

  1. Disconnect battery ground cable. Disconnect electrical connector from filler cap.
  2. Remove fluid reservoir filler cap.
  3. Raise and support vehicle.
  4. Remove front wheels.
  5. Remove dust cap and loosen bleed nipple. Connect a bleed tube to bleed nipple and into a suitable container.
  6. Pump brake pedal until all fluid is expelled. Tighten bleed nipple.
  7. Lower vehicle. Install brake fluid reservoir cap. Remove air cleaner and air cleaner outlet tube.
  8. Disconnect central electrical box electrical connector.
  9. Remove central electrical box retaining screw.
  10. Remove central electrical box and relocate to air cleaner area.
  11. Disconnect brake fluid feed tube. Disconnect brake lines.
  12. On models with anti-lock brakes, disconnect brake lines from Hydraulic Control Unit.
  13. On all models, remove brake booster vacuum hose.
  14. Extract master cylinder from vehicle.
  15. On models with manual transaxles, remove clutch hose from brake/clutch reservoir.
  16. On all models, remove master cylinder nuts and remove master cylinder.

To install, reverse removal procedure. Bleed brake system.

May 31, 2010 | 2001 Ford Focus

1 Answer

I need step by step instructions on how to bleed brakes on my 2005 toyota celica


If you don't have someone to help you you'll need to get a one man brake bleeding kit. The bleeding kit will take the place of the helper. IF you have a helper start with the rear passenger side wheel (furthest from master cylinder). Remove the wheel, have a helper sit in the vehicle and pump the brakes several times (motor off). Tell them to hold the pedal down while you open the bleeder screw. Tighten the bleeder screw before the helper releases the brake pedal to avoid sucking air back into the line. Repeat this process until the fluid flows out of the bleeder with no air. Then repeat these steps on each wheel. The order of bleeding is always furthest from the master cylinder. Rear passenger, rear driver, front passenger, and lastly front driver. After each wheel is done check the fluid level in the master cylinder and add as necessary. You don't want it to get low and **** air in from the cylinder.

Nov 06, 2009 | 2002 Toyota Celica

2 Answers

Hi. I have a 1990 Ford F350 diesel UHaul with no


when you replace the master cylinder, your are supposed to pump it up manually before you install it. If you don't, you'll have to sit there and pump the brake pedal a couple of thousand times as one almost microscopic air bubble at a time escapes the pressure tube and back fills with fluid. once you can push the pedal repeatedly without any bubbles escaping into the reservoir, then bleed the brakes. Starting with the farthest, usually the Right Rear and work your way up. Make sure you keep the fluid level topped off. If it sucks air once, you have to start all over.

Sep 23, 2009 | 1990 Ford F350

1 Answer

Is a computer needed to bleed brake system?


bleed the brakes the easy way is to have two peoples one to pump the brake pedal and the other one is to open the bleeder use the driver side front wheel it close to the master cylinder and you could get a brake bleeder and do it by yourself.

Feb 16, 2009 | 1990 Lincoln Mark VII

1 Answer

Spongy brakes


brake ;ines have air in the lines.
bleed brakes.Start with good
manul will worth more than ever
know

Dec 21, 2008 | 1988 Ford Thunderbird

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