Beach n Dodge

Ive been off of the forum for a while, with moving and other things. I have searched the forums and have not found another problem like this, so here it is......My brakes were starting to go in the front, so i had them replaced, felt good for a while then they started applying themselveles when i turn the wheel... i actually have to lift up the peddel with my foot if i am in a parking lot......I do have a edge with the wire tapped, exhaust, and a K and N filter, and a built Tranny. This problem is verry new to me......and I dont have a fuel pressure gauge yet but it is comming..Also the truck just turned 100 K, and I have owned it since new......
Thanks in advance for any ideas.........

nitrousn

Sounds more like tight axle joints. Brakes dont commonly apply them selves.

BigIron70

I would check for contamination in master cylinder. If rubber seal on master cylinder cap is swollen you might have gotten oil into brake system. Try spinning front wheel when off the ground to see if they are dragging. If they are then open the bleeder valve, if they spin free you have a master cylinder binding and applying pressure. Replace master and flush brake system. If openning bleeder and wheel still binds then caliper is causing problem.

Beach n Dodge

Thanks for the imput, I dont think it is the axle shafts, because you can actually feel the brake pedel go down when turrning. When I take off i actually can lift the pedel and it helps. I will check the the master today, and let you know if this is the problem,,,, Thanks again

Totallyrad

I'm betting on the flexible lines in the front. In years gone by I used to get my brakes done by Midas. One day I looked in while they were working on my truck and the mechanic had vice-grips clamped on the front lines.......party over. There may not be any outward signs of damage on the lines but clamping them does cause them to break down internally.

powermad

there's some kind of vacuum in the lines sucking the pedal down and cutting off the pressure through the lines causing the breaks to lock when you turn. thats the only thing i can think. im no were near a expert but why dont you just start with checking all the brake parts such as lines and calipers rotors fluid level fluid quality and have someone sit in the driver seat and turn the wheel all the way to each side while you look to see if anything is binding or rubbind.

nickg

Faulty hydroboost would be the culprit, all the above mentioned things will only keep the brakes from releasing, mysterious brake application is the hydroboost,

Beach n Dodge

Thanks again for all of the imput...... Did not have the weather here in FL to check tonight. Truck 2 big or garage to small....., But will as soon as the rain stops.

Fishin2Deep4U

Sounds like the hydroboost system to me as well, but everything should be checked.

I had a problem recently with a stuck caliper piston took out two other wheels braking, so it can happen. As the fluid was being boiled by the sticking caliper, it was expanding into the area of least resistance, the other calipers.

Dave

CoastalDav

Advice;

If you can't find the problem, take it to Port Canaveral Auto Repair, talk to Jimmy. He'll figure it out. He does the best brake job in the area. He's done all my stuff since I've owned my truck, 201,800 miles on it now.

My brake lines are replaced every time I do a brake job.

783-5058.

Dave

Beach n Dodge

Had the weather tonight. Checked everything . All looks and feels good. Advance is the latest open parts store here and it closes at 9...... So much for a small town..........had to go to Walley World and they dont sell synthetic ps fluid, so i chaanged the fluid with regular fluid and it did help while it was jacked up, the road trip was good for the first 2 minutes then all over again. I am definitly leanning towards the Hrydraboost. I will try synthetic tommarow for a bandaid while i order a new one. and once again thanks for everyones imput,, will keep everyone informed

Randy

84crewcab

Did you check your front hub bearings for play? I had the exact same thing happening on my 1996 and it when I was turning the tire was tipping and pushing the caliper and I could feel the brake pedal move. Replaced the badly worn L/H front bearing hub and the problem instantly went away.

nickg

Your correct in that a loose bearing will cause issues BUT it will cause excessive brake pedal travel, because the rotor will cause the caliper piston to be pushed back,which in turn forces the fluid back to the MC reservior, which means you'd have to pump the brakes to force the piston to contact the brake pad. you might feel it in the pedal but it should not cause the pedal to apply the brakes, until you lift up on the brake pedal.
There is a push rod between the Master cyl and the hydroboost that is only connected to the HB via a clip, so there is no direct connection between the MC and the HB, so it acts in a one way direction only, the MC cannot cause the brake pedal to move (brakes yes pedal to apply NO), but the HB can cause the MC to apply.
when you release the brake pedal it allows the rod to move away from the MC piston, then the MC piston assy is forced back because of the internal spring

There is no other senerio I know of that could cause the brake pedal to apply on its own, based purely on how the 2 components work, there are other things that can cause the brakes to remain applied, but once you factor in a brake pedal that is moving to the floor on its own it cancels out all the other variables

Beach n Dodge

All Axles, Bearings,, brake lines,, calipers , ball joints, and fluids were good. Cant find synthetic PS fluid here after 6 pm.........Any recomendations on which brand to use.......One other thing been online looking for a hrdroboost but cant find one except for the dealers.. any ideas....

nickg

I've heard that Valvoline stopped making a synthetic PS oil, but you might get lucky and find some old stock somewhere, walmart maybe, I use Amsoil Syn PS fluid its quite spendy, but you dont need a lot of it, a quart will get you 2 or more flushes (turkey baster method)