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2006 isuzu npr 5.2L Diesel

My Front brakes are locking up. If I loosen bleeder screw the calipers will unlock. drive the truck for about 3 - 4 miles and brakes are locked up again. not just one side but both sides. usually I would say bad caliper or a collapsed flex line but both sides are doing it at the same time...... any suggestions ???

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  • 202 Answers

Slider pins should be replaced and antilock mechanisms cleaned with brake cleaner. If that doesnt help then its calipers. And yes they do stick at the same time if they both have sat for a long time. Good luck!

Posted on Oct 17, 2013

Testimonial: "thanks for the suggestions we use this truck everyday and drive for roughly 300 miles a night with it so they haven't been sitting. is there a check valve"

  • 1 more comment 
  • John Ziehm
    John Ziehm Oct 17, 2013

    I would take them apart and clean them and replace the sliders 1st.

  • buddy dagostino
    buddy dagostino Oct 17, 2013

    yea thats what i am tinking too. the rotors last night got cherry red and the fluid was boiling so im replacing rotors and flex lines and all fluid . will let you know how it goes!!! thanks again for the suggestions

  • John Ziehm
    John Ziehm Oct 17, 2013

    ok-good luck!

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Posted on Jan 02, 2017

c1apton15
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SOURCE: 2006 Ford F250 Super Duty King Ranch Diesel four

About the only thing left is to replace the caliper. I've seen a few times, but not common. Piston gets bound on corrosion in caliper and doesn't retract completely.

Posted on Mar 09, 2011

  • 18 Answers

SOURCE: front disc brakes

Replace the rubber brake hose going to caliper, do both sides. Your problem will be solved

Posted on Sep 18, 2008

  • 58 Answers

SOURCE: no brake line pressure on 1 caliper after replacing caliper

I suspect you may have twisted the hose on re assembly. The other possibility is that the bleed nipple is choked with dirt and rust. Remove it completely and see if the fluid starts to run out. If so replace nipple or clean out.

Cheers John

Posted on Dec 17, 2008

  • 6 Answers

SOURCE: After replacing drive side caliper, both front

I assume you mean that you replaced the front pads and rear shoes. Or did you also replace the disks and drums?? Either way you should be ok unless you also replaced the slave cylinders on the rears.
The fluid flows back up to the Master Cylinder as you squeeze the calipers and the slaves to fit the new parts in. Some people pre-fill the caliper to reduce the amount of air and make bleeding easier.Now .....Grinding better be a wrong choice of words. Possibly you spilled fluid on the pads while bleeding the lines. This will cause a binding and shuddering when you apply brake pressure. This will also make you think the lines are not bled properly because of the increased pedal pressure you are putting on the wet/lubricated front pads. If so, replace the pads. Don't try washing them with aerosol cleaner cause it takes more time and money than simply changing them.

Posted on Oct 04, 2009

heimlich
  • 1978 Answers

SOURCE: front brake caliper on brivers

Chances are the calipers are not at fault.You probably live in a northern state that puts salt on the roads in the winter time. Take a close look at the brake shoes. and where they mount. Often the manufacturer will put a thin metal plate over a caste iron iron caliper/brake pad mount. This is to give the brake pads a smooth surface to slide on. Take the the thin metal plates off of the bracket and file off the rust under neath the plates. The rust is expanding and pushing against the back of the thin plates causing the brake pads to bind and stick. This is then overheating the caliper and ruining it. Take a file and remove all the rust on the mounting brackets especially under the the brake pad slide plates. Once the brake pads move freely again the problem should go away.

Posted on Aug 24, 2011

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1 Answer

What is causing both front brakes to lock up


check master cylinder not releasing the brakes. the brake flex hose for each wheel may have collapsed internally. the way to find out is when the brakes don`t release loosen the bleeder screw on the brake caliper if brake fluid squirts out or runs out and the brakes release then the flex hose has collapsed. if the brakes don`t release and no fluid squirts out then the calipers are seized and need replacing. the shuddering is an indication the brake rotors are probably warped and need replacing.

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1 Answer

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I have a couple ideas for you. first make sure you bled out all 4 wheels making sure to get the air out. also check your abs module and see if it has a bleeder screw on it and bleed it. The second thing is after you drive it, does it seem like the brakes don't release after braking? is it ok when it's rolling? you may have a collapsed brake hose from your body to the calipers, allowing pressure through, but not back. This also makes sense after a few miles, when your brakes are just getting warmed up. after it starts locking up, jack it up and see if the wheel will spin. then see if the caliper piston will go back in. if it doesn't want to go in as easily as it should, or not at all, open the bleeder and see if it goes back. if it does, there's your problem, the hoses.
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