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Suspension 2nd Gen Dodge Ram Suspension Problems and Questions


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  #1  
Old 02-14-2014, 09:58 PM
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Exclamation No brakes

Today I started feeling a little mushiness in the brake pedal, and discovered that if I kept some pressure on the brake pedal while the truck was moving forward slowly, the pedal would eventually go to the floor and I would have no brakes. The dash warning lights would come on.

I can stop the engine, then start up again and have brakes, and the lights will go off. But the same thing occurs with the pedal if I drive slowly with slight pressure on the pedal.

I can pump up the pedal with the engine off and it will hold pressure. When I start the engine, the pedal goes down some - that seems to indicate normal vacuum boost operation.

There are no puddles of fluid on the ground, the fluid reservoir is staying full. I'm thinking Master Cylinder.

Anyone else got any input?

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  #2  
Old 02-14-2014, 10:21 PM
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Hey Sam, your thinking is right along with what I am thinking. Sounds like you have a very small leak in the membrane on the plunger. Best way to find out for sure, it take the reservoir cap off, press the brakes lightly like you explained, and see if you have fluid on the dry side of the plunger.
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Old 02-14-2014, 10:41 PM
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Yup...sounds to me like it's a bad master cylinder.

Here's a time saving hint if you change it:

Bench bleed the new master and get it bolted to the truck and start threading the brake lines back onto the master. Snug 'em up and then back off about a turn.

Have someone get in the truck and press the pedal to the floor (ONCE) and hold it there. Tighten the lines up and then tell them to release the pedal.

The small amount of air in the top of the lines will get sucked up through the new master and there is no need to bleed the entire system. Saves time, brake fluid, and laying on your back.
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  #4  
Old 02-15-2014, 12:11 AM
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Thanks, guys. Warlock, that trick about priming and bleeding the master definitely saves time, effort and aggravation. My uncle taught me that years ago when I used to help him in his shop.

The master cylinder is original to the vehicle (98 Ram) and frankly I'm surprised that it hasn't gone out before now. Been kind of waiting for it to go on me.

I'll double check everything in the morning - the rear wheel cylinders should be OK since I replaced the right one a couple of years ago, and the left one in the last month. But I'm gonna pull both rear wheels and check just to eliminate the possibility that one of them may be leaking.

I'll keep y'all posted. Thanks again!
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Old 02-15-2014, 12:52 AM
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Quote:
Originally Posted by RogerRamJet View Post
Hey Sam, your thinking is right along with what I am thinking. Sounds like you have a very small leak in the membrane on the plunger. Best way to find out for sure, it take the reservoir cap off, press the brakes lightly like you explained, and see if you have fluid on the dry side of the plunger.
RRJ, if by "dry side" you mean the back section of the reservoir behind the divider, yes, it's full of fluid. If you're referring to something else, please let me know.
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Old 02-15-2014, 09:39 AM
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Quote:
Originally Posted by DaSOB View Post
RRJ, if by "dry side" you mean the back section of the reservoir behind the divider, yes, it's full of fluid. If you're referring to something else, please let me know.
Yes, yes, the back section of the reservoir.
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Old 02-15-2014, 11:13 AM
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Well, I installed a new MC and all is well now. Had to have been the plunger getting weak/worn and letting fluid squeeze by. Brakes are good to go now.

Thanks for all the input!

Sam B
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Old 02-16-2014, 04:40 PM
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Default No Brakes resolved.

Thanks for posting that the issue was resolved.
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  #9  
Old 02-17-2014, 03:47 PM
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Voonderbar! Yes, thanks for the update.
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Old 04-12-2014, 11:32 PM
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I have the same problem as DaSob, replaced MC today, bled the brakes and the problem is still there...absolutely no difference. Any ideas on what to look for next? Thanks.
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