New to me 2002 F-250 PSD, done brakes all the way around for piece of mind.
Job went very well, replaced one caliper and its bracket, serviced all pins and replaced one set of pins as well, (different corner). Bled brakes all day via gravity, watching reservoir and filling as needed as to flush in new fluid. Truck is in great shape. Mileage 153,000 no rust, turned all rotors just to re-surface.

Now here is what's happened, my pedal is good but it pulses in the first 1/2 inch of travel and once passed that no pulse, got under and watched the pedal rod do this as I very easily touched it in that first 1/2 inch of travel, you don't even begin to get much brake started here if any! Truck running; yes-Truck not running no pulse action occurs.

I'll add this: fluid removed had a green tint to it but had no moisture or bad odor. Different fluid??? I didn't know. Used Dot 3 Off the shelf O'Reilly's.

Any advice here, hydro-booster didn't like fluid? Air? Master cylinder?

No leaks before or after this procedure.

 

I would appreciate a little advice if it has been seen or experienced before.

Like stated above the pulse is quick and over at the same time, Its like, as soon as you set your foot on pedal, first half inch of travel distance. Never have experienced this on any vehicle, How did a Hydro-Boost go out while working on brakes if it was not out the day before.

My theory is different fluid, or even some stop leak additive PO used, now why would it react to regular Dot3 fluid? Or just Air locked at this point? never had that happen either.

Someone pipe in if possible?

 

Weekends can be slow on FTE.

So, whose pads and caliper did you use? The reason that I am curious is because I have had a heck of a time recently with NAPA UltraP's...pads and calipers...never again. EBC yellow from now on. Calipers?...still looking for an alternative.

Have you bled the hydroboost? It is done by flushing your power steering fluid.

Does the pulsing in the pedal also present itself during braking while driving similar to the anti-locks malfuntioning?

Front and rear ABS or rear only? If front, are the wheel sensors connected? Is there an ABS light? Since lights can burn out, can you monitor your ABS system with a scan guage? AE or FORScan

 

When putting the wheels/tires back on, did you torque them down properly?

 

Are you saying you turned off the truck while moving and hit the brakes without pulse? Or are you saying the pulse happens regardless of truck movement?

 

No truck movement necessary, Just running pulse there, like I said you can just touch it with your finger and yes feel in your foot at beginning of travel brakes are fine.

 

Yes always. truck doesn't have to be moving just running

 

O'rielly's ,, Ford A1-Cardone, Wagner Thermo Quiets, Work there, two years now, (commercial sales) not a pro but at my age mistakes are a redo.

The hydro flush is done how may I ask? This occurred same day only after re-install and bled ready to drive. Now that given brakes are fine, pedal good just this pulse at first touch stops soon as it starts.

The truck isn't pulsing just the pedal, no unordinary truck braking.

 

www.youtube.com/watch?v=-TSw2Qlzsx8

ATF fluid only...

Don't let the reservoir run low...

 

Ok but where do I begin? Simply take a line loose,,,,,,,,,,,,,,OK saw the link, duh

 

Ok, I'll try this later in the week, for now I need to look at this a little more since not having opened that system.

 

I believe your problem is air still in the brake hydraulic system. Gravity bleeding cannot remove air that has gotten trapped on a high spot in the tubing. The fluid just flows past the bubbles of air (similar to what can happen to a cooling system).

A hand vacuum pump is more reliable or take to a shop and have them use a pressure bleeding system. Or you could try the time honored method using a person in the cab pushing on the brake pedal while you open a bleeder screw. The reason the pedal method works so well is that there is a lot of fluid flow, which takes the air bubbles with the fluid.

Larry

 

^^^^ what he said I tryed gravity bleeding and dont work, do the true and tryed method.

 

never mind.

 

How does your power steering pump sound?