Question about 1988 Ford F 150

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Replaced master cylinder because of weak braking and mushy,slowly sinking brake pedal. Also flushed and blead. The old one was leaking into the area between booster and master cylinder. After about 150 mi th brakes are doing the same thing again. Could it be the booster?

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Yes could be,also check for vacuum leak going to booster or leaking wheel cylinder

Posted on Sep 02, 2010

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1999 buick century brake pedal goes to floor-put new master cylinder on and blead both brake lines and master cylinder and pedal still goes to floor


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Brake pedal very soft and mushy. Brake warning light comes on and stays on. Is this a master cyclinder failure?


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2006 Rav4 mushy brakes. THis car has had mushy brakes since we purchased it. Pedal sinks quite a way before brakes engage. Pedal pressure builds after several frequent uses. This is very un-nerving when...


it sounds like the master cylinder, but I would bleed the lines first, if that doesn't help then I would replace the cylinder. It is not that hard to replace just make sure you drain all the fluid first as it is very corrosive and bled the brakes once the new one it installed. it should not cost more the a couple hundred bucks. Good luck Tim

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Power steering is weak and pump is whining, also the brakes are a little mushy. Is there a booster pump that affects both of these? Fluids seem fine.


If your power steering is whining you may just be low on power sterring fluid. I would check that first. If that is good your power steering pump may be on its way out.

There is a power brake booster in your system, but that should not affect if your brakes feel "mushy". I would look at the master cylinder, you probably need a new master cylinder they have a tendency to leak fluid past the seals as they age giving your pedal a mushy feeling. I woould also check your brake lines on each wheel to see if one might be leaking, this will give you a mushy feel as well. I doubt that is the case if you aren't loosing fluid however.

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Break peddle to the floor no resistence behind it, and not stopping well, no noise.


First of all, don't drive with the brakes this way...
Sounds like you've lost the hydraulic pressure in the brake system.
Check the following:
1. Open the hood and check the brake fluid reservoir to make sure it's full of brake fluid. If not, top it off with the recommend brake fluid.
2. Try the brake pedal again, with the car running in PARK, press a few times and see if the pedal "firms up".
3. If it does, press and hold the brake pedal with the motor still running. Look to see if the pedal slowly sinks to the floor or if it's a bit "mushy" or feels ok.

If the pedal sinks to the floor, you've got a major leak in the brake system. This could be from one of the wheel cylinders, from the disk brake caliper piston, a damage brake hose, brake line, a faulty master cylinder, power brake booster.
The best way to check is a visual inspection. Look around each wheel- look for fluid leaks, for signs of fluid where you park, on the axles, under the hood near the brake fluid reservoir, etc.
If after the fluid is topped off, you get a mushy pedal, I would suggest getting the brakes "bled". Bleeding the brakes simply means getting all the air out of the brake lines. (Air compresses where brake fluid won't- if the pedal is mushy it's got air.)
If you've not done brake work before, I highly recommend taking it to a local mechanic to help you out. You really want to KNOW that your brakes are going to be there when you need them. So if in doubt have a mechanic check it out.

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Mushy brakes are almost always 1 of 2 things:
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Either way, have this checked out at a brake shop immediately. A soft brake pedal is not something to be fooled with.

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Sounds like your master cylinder is shot. Go to a parking lot, stop, and pump the pedal a bunch of times. Then get out and see if there is any fluid leaks by any of the wheels. That would indicate a brake line leak. My first guess, however, is your master cylinder.

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