Question about 1997 Ford F350 Crew Cab

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Brake peadle goes soft at slow speed or when bakking up. Replaced the following, master cylinder. vac pump, complete front and rear brakes. booster.

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Sounds like there is air in the brake lines. did you bleed the fluid until it came out clear? Not foamy color.

Posted on May 11, 2010

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Posted on Jan 02, 2017

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2001 Silverado 2500 HD Why Rear brakes don't work after I installed new hydro-boost power booster, master cylinder, calipers, and pads. I bled master cylinder before installing, and brakes beginn


Hello Patricia,

Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
been discovered when you had the system bled.

The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide pins...as your calipers are also new that is not your problem.

If your brake pedal feels spongy and travels to the floor board you have air in the system, a brake fluid leak or a failure in the power steering system, such as a broken hose, broken power steering pump drive belt, or failed pump, would result in a loss of pressure to both the hydro-boost and steering.

Find more information here:

. Hydro Boost Power Assist Systems Operation Diagnosis and Repair

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I replaced disc brake pads, rear shoes. wheel cylinder,master cylinder, power brake booster all new. Question: My brake pedal is not solid,goes low to the floor almost. I have bled the master cylinder 1st,...


Check your lines going to the brakes the rubber hose on the 1993 chevy have a tendancy to crack and brake are you using an excess of brake fluid

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1 Answer

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Replace your master cylinder. It is leaking out of the back of the master cylinder and into the booster. If you unbolt the master and carefully look into the booster, chances are you will see brake fluid. Replace it, bleed the entire system, and enjoy your truck again.

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Install new brake pads and rotors all 4 wheels. Replaced front 2 calipers. Bled brakes. New clean fluid coming out. pedal is still soft and goes to floor. 200 Seebring.


Are you losing any Brake Fluid? Is it visible anywhere at the four wheels? Is it visible anywhere else?
The Master Cylinder may be defective. When you bled the Brakes did you maintain proper Brake Fluid Level in the Master Cylinder? If you didn't: and air entered into the Master Cylinder there maybe air within in the system in the Master Cylinder. You can bleed the Master Cylinder by removing the brake lines, adding more fluid, pumping the brakes, bleeding the air out of the system.
Are you losing Brake Fluid and can't find a noticeable leak? Then there is a good posibility that the rear seal in the Master Cylinder is leaking and the Fluid is going into the Brake Booster - which is the large wheel shaped drum located on the fire wall. In this case both the Brake Booster and the Master Cylinder will have to be removed and replaced. The Booster contains seals that Brake Fluid is very caustic to and will ruin these seals- causing future failures.
If no Brake Fluid is lost, no leak found: Check the Brake Booster Vacuum Advance. This should be connected to the outside of the Booster, attached to a hose, with the hose going to the engine. Check to see if this is working properly. Replace if needed.

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it could be that the master cylinder is bad or the brake booster is bad also check the vacum hose going to the brake booster if it has a hole in it it will lose pressure and make the engine lose rpms

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SOFT BRAKE PEDAL ON MY DAEWOO


MAKE SURE THE ARE NO OTHER LEAKS.IF U DID NOT BENCH BLEED THE MASTER CYLINDER BEFORE U PUT IT ON U PROBLEBLY HAVE AIR IN THE SYSTEM.BLEED THE MASTER CYLINDER AT THE LINES THAT COME OFF OF IT.THEN U NEED TO BLEED THE REAT OF THE BRAKES IN THIS ORDER.RIGHT REAR,LEFT FRONT,LEFT REAR.RIGHT FRONT.WHEN BLEEDING THE BRAKES WAIT 15 SECONDS BETWEEN PUMPS OF THE BRAKE PEDAL.IF U GO TO FAST U CAN DAMAGE THE MASTER CYLINDER.GOOD LUCK

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Brake pedal goes soft when engin is running on 1998 chevy 1500


If your rubber brake lines are from the factory those hoses can stretch when the brakes are applied. This same thing happened to me. I replaced the master cylinder, with little to no change. So then I changed the brake booster. And if you read the fine print if either the brake booster or the master cylinder go bad it can take the other with it. So if the rubber brake lines don't fix this I would look at replacing both the master cylinder and the brake booster at the same time. But if you would like to trouble shoot this issue a bit more you can clamp off just the rear brakes or just the front brakes or even clamp off 3 of 4 or if it might be a issue before it even hits the brakes them self you can clamp off all 4 of the brakes to see were the problem is. This is to test fewer components at once and to see if the issue is with the cylinders / calipers or hoses. This will help you determine the location of the problem faster and with out throwing parts at your truck and hopping it fixes the issue.

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2 Answers

97 ford e350 brake pedal goes to the floor...


are your rear drums set up? why did you bleed the brakes. when only when you installed new pads?

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