Question about 1997 Ford Expedition

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How to know if my brake booster or my master cyclinder is the problem on 1997 ford expedition? My brakes don't go to the floor when they wanna fail but I hear a sound near my dash where I'm driving, it sounds like a tumbling rumbling sound and they seem like they aren't gonna stop my ford but they do after some distance of trying to stop.It is rather scary cause there is no warning when this is going to happen. I may drive it for 2 days with no problems and then all of a sudden it does this. Have had the lines bled but didn't solve the problem. I just hate to buy the wrong part. Really, really hoping someone can help. Thanks. P.S this is my friends computer so I will have to leave her email but she will let me know when someone has the answer.

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If you have drum brakes, check to make sure the wheel cylinders are not leaking, if they are not i would throw a master cylinder in the vehicle because its not the brake booster, all the brake booster does is provide assistance for braking making it easier for you to depress the pedal.

Posted on Apr 28, 2010

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Do you have anti-lock brakes? there may be a malfunction in the abs system causing it to activate. or do you generaly drive on slippery surfaces? because the abs does make a rumbling noise when activating properly as well.

Posted on May 28, 2010

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1 Answer

How to fix power brake booster on a 2003 Ford Expedition


It isn't that bad of a job if you are able to get under the dash to remove the actuator rod from the brake pedal and unbolt the 4 bolts that hold the booster to the firewall. Other than that, you just have to unhook the vacuum line from the booster under the hood and remove the two bolts that hold the master cylinder to the booster. You do not have to open up the brake system, so there is no need to worry about having to bleed the brakes.

Feb 12, 2016 | Ford Cars & Trucks

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Why is my 97 expidition losing brake fluid. I cant locate where it's coming from but as soon as I put it in it runs out


It could be running out the front of the master cylinder into the brake booster. Unbolt MC and ease it back to see if fluid is present. If not, check rear brake drums.

Jun 03, 2015 | 1997 Ford Expedition

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Need to know procedure for bleeding master cylinder and lines.


There is a special pump used to bleed the master cylinder first then after the master cylinder is installed you bleed the brakes and fill as you go it's a two-man operation

Mar 03, 2015 | Cars & Trucks

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2006 toyota tundra sr5 crew cab 4x4 losing brake fluid in the booster ? What do I replace there seems to be some kinda control valve maybe for the abs in between the master cyclinder and the brake booster...


Take Off Nuts That Hold Master Cylinder To Booster. Pull Master Cylinder Away From Booster--Do Not Damage Lines--Feel With Finger At Rear Of Master Cylinder For Fluid--If Found Replace Master Cylinder And Booster With Total Unit Combo For Better Warranty. DO NOT FOOT BLEED--Pressure Bleed Or Gravity Bleed Only.

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Can you brake booster make you engine smoke


Sounds like some brake fluid has leaked down on your exhaust manifold and is smoking.

Apr 29, 2014 | 2002 Toyota Tundra

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How do i replace a power brake booster on a 97 ford taurus


  1. Step 1 Mark the brake lines coming into and out of the master cylinder using masking tape and permanent marker.
  2. Step 2 Orient the tube wrench so that it grabs the end of the nut by first sliding it over the brake line.
  3. Step 3 Pull the brake lines out of the master cylinder.
  4. Step 4 Unbolt the two bolts that hold the master cylinder to the brake booster.
  5. Step 5 Slide the master cylinder off the brake booster.
  6. Step 6 Remove the bolts that hold the brake booster to the firewall.
  7. Step 7 Remove the cotter pin from the pin holding the back of the brake pedal to the master cylinder.
  8. Step 8 Slide the brake booster to brake pedal pin out of the mounting bracket.
  9. Step 9 Pull the brake booster off the firewall.
  10. Step 10 Install the new brake booster. Installation is the reverse of removal.

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1 Answer

Brake problem


Ive seen in the Ford Escape the fluid leaks through the back of the master cyclinder so might take off the master cly. from the brake booster and look into the booster to see if there is fluid build up inside it. Could be the same problem here. worth looking into.

Dec 14, 2009 | 2004 Mercury Mountaineer

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Brake boosters


you can tell if the brake booster is bad, rearly it goes bad, your master cyclinder usually go out before your brake booster will. It feel spoon-gy and while pressing down on the brake peddle holding it down you can feel the pressure bleed off with no resistance. If the brake booster is bad you have only ONE shot for braking each time; its very dangerous. Did you bleed the brake lines to release the the air out of the system when you replace the pad? whom ever did your brakes should know to bleed it. having air in the line can be dangerous as brake will not function and operates properly and can cause an accident. If you did bleed the brakes and your booster is fine then you have a master cylinder problems. master cylinder gives you a spoon-gy feel and when braking the peddle it tend to go to the floor and you have to let your foot up to build the pressure and applied the brake again to make it stop. Master Cyclinder use or rebuilt will cost you 30.00 bucks and new will be 58.00 bucks and they are easy to replace. Just make sure you have plenty of extra brake fluid to bleed all 4 brake line..I recommend you reused the brake fluid when bleeding the unit saving some money than wasting the fluid, glass jar is the best for capturing the bleed fluid with automotive smallest vacum hoses you can purchase at any auto discount store 58 cent a foot, which you only need 2 foot. good luck I hope that help some.

Jul 10, 2009 | 1998 Chevrolet Cavalier

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Replacing a brake power booster


you need to be bendy to get linkage undone under dash at pedals..remove brake master and away..unbolt booster and away you go..good luck

Feb 26, 2009 | 2004 Ford Expedition

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