Question about 1998 Dodge Ram 1500 4WD

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98 dodge ram 4x4 brakes go to floor after starting truck

I changed calipers and bled the lines. i have a solid pedal like theres no air. when i start the truck the pedal goes to the floor. i have bled all the lines and replaced the master cylinder. anyone have any thoughts? thank you

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  • joshua wright Oct 27, 2012

    i put new calipers, rotors, and master cylinder on it. bench bled the mc before installing. bled all the lines properly until no air. the pedal feels good until i start the truck up. thats when i have no pedal. the combo valve is working according to how the haynes book says it should and the abs module is only for the rear brakes. i even plugged the line before the rwal valve and still have the same problem

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  • Dodge Master
  • 14,398 Answers

CAUTIONBleeding of four-wheel antilock brake systems require the use a dedicated scan tool.http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0900c152800c0dbe

Posted on Oct 27, 2012

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Posted on Jan 02, 2017

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Tim Owyang
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SOURCE: 2001 RAM 2500 Brake Pedal Goes to Floor

Excessive runout or wobble in a disc (Rotor) can increase pedal travel due to piston knockback and increase piston seal wear due to necessity of caliper to follow disc wobble. Thickness variation in a disc can also result in pedal pulsation, chatter and surge due to variation in brake output when disc section is uneven. Dishing or distortion can be caused by extreme heat and abuse of the brakes. Hope this helps, Good luck.

Posted on Apr 09, 2010

mitchbtu
  • 121 Answers

SOURCE: Brake pedal all the way to the floor...Possible abs module?

Im going to assume that a mechanic has already checked for the most simple causes like making sure the brakes have been bled. If the abs module is faulty it will default to just a no abs state, but that wont cause the pedal to go all the way to the floor. I agree that replacing the caliper is probably gonna fix the problem, but I might try to bleed the brakes first and see if that solves it first...

Posted on Jan 24, 2010

  • 432 Answers

SOURCE: New master cylinder and booster. Brakes stop good

Well if you have bled it correctly starting at the farthest out(PS Side Rear) and working to the closest(DR Side Front) and you make sure to close the bleeder valve before letting up and repumping the peddel,then I would say that the seals in your new master cylinder may be bad.When you bled the second or third time if there was no air then I would say you have a bad master cylinder.If there was air then you have another problem.Well hope this helps and good luck.

Posted on Mar 14, 2010

  • 151 Answers

SOURCE: 2001.5 Dodge Ram Diesel 2500 4x4 Brake Pedal drops to floor

It sounds like you have a bad mastercylinder cause when you panic brake it doesn't have time to bleed through the valve in the cylinder but under normal braking your foot is on pedal longer in turn giving the fluid time to bypass the valve in the mastercylinder in turn the pedal going to the floor.

Posted on Apr 21, 2010

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SOURCE: I'm having problems with my brakes. I have a 2000

Not likely the booster. and what you describe sounds like a M/C problem, but here is some stuff to try.

Master cylinder needs to be bench blead. No bench bleed, you may never get brakes. You just cannot push air down the lines. a kit can be bought at the parts store that has hoses that screw in where the brake lines go and loop back into and below the fluid of the reservoir. Pump till no bubbles.
FROM this point, do not allow the fluid in MC to run low, or start over.

Now go and bleed the rest of the brakes.

When you finally get it working, press the brakes hard, **** off of the seat pressing, just to be sure everything is okay. You will be pressing harder than that in an accident situation. The brakes need to work.

Anyways, I think that you still have air and resolve that and they will start working.

Doc

Posted on Nov 22, 2010

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1 Answer

Brake pedal goes to floor


for the pedal to go to the floor there is still air in the brake system. Start again starting from the longest line bleeding each in turn to the shortest line . make sure you have adjusted up the rear brakes before bleeding as every time you press on the pedal the shoes expand right out and when you take your foot off the pedal the shoes go all the way back in. adjust them manually and do not rely on the self adjuster as it only adjusts on wheel movement

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Well if you have bled it correctly starting at the farthest out(PS Side Rear) and working to the closest(DR Side Front) and you make sure to close the bleeder valve before letting up and repumping the peddel,then I would say that the seals in your new master cylinder may be bad.When you bled the second or third time if there was no air then I would say you have a bad master cylinder.If there was air then you have another problem.Well hope this helps and good luck.

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