Brakes - Dodge Cummins Diesel Forum
3rd Gen. Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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post #1 of 4 (permalink) Old 04-17-2019, 12:13 PM Thread Starter
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Brakes

Any direction would be a big help. I was heading home the other day and noticed that my brake pedal was feeling as firm. When I pulled in the driveway and pressed the brakes the pedal went to the floor. Of course, I thought I had a huge fluid leak somewhere, but nope. So I know my other options are master cylinder, hydroboost, or maybe even the ABS pump for some reason. When the truck is idling the pedal feels fine. As soon as I start driving I loose pedal pressure. The pedal is a tad spongy so it seems like they need to be bled, but I don't see that being my only problem. Any help would be a big help so I don't start throwing money at this more a new master cylinder and a new hydroboost. Thanks

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post #2 of 4 (permalink) Old 04-17-2019, 04:46 PM
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All your wheel cylinders checked out okay I'm guessing? And you haven't noticed any fluid level drop in the master cylinder?

I know the prospect of it doesn't sound fun but I would at least try to bleed the front brakes just to ensure you don't have air in the system somehow..if they flush out clean then chances are it is an issue with the master cylinder or booster

2006 Ram 2500 QCSB 4X2 SLT, G56, BBI Stage 1's, 62/65 Tater Built HE351, FASS 150, EFI Live by Gordon, Valair dual disc organic
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post #3 of 4 (permalink) Old 04-19-2019, 07:44 AM
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How does the pedal feel while in neutral and idling? Are the pads worn? Master cylinder and power steering fluid levels ok? Brake and steering hoses ok, no cracks, bulges, kinks, etc.? When the pedal is applied under normal braking, is the pedal slow to return to normal height? Steering ok?

Not sure what year truck you have but according to the 2006 FSM:

A hydro-booster function test can be done as follows:

With the engine off, depress the brake pedal several times to discharge the accumulator. Then depress the brake using 40 pounds of force and start the engine. The brake pedal should fall and then push back against your foot. This indicates the booster is operating properly.

Accumulator Leakdown:

1. Start the engine, apply the brakes and turn the steering wheel from lock to lock. This will ensure the accumulator is charged. Turn off the engine and let the vehicle sit for one hour. After one hour there should be at least two power assisted brake application with the engine off. If the system does not retain a charge, the booster must be replaced.
2. With the engine off, depress the brake pedal several times to discharge the accumulator. Grasp the accumulator and see if it wobbles or truns. If it does, the accumulator has lost a charge and the booster must be replaced.
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post #4 of 4 (permalink) Old 04-19-2019, 08:05 AM
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Here's a video....even though it's for a Chevrolet product, it gives a comparable description to the Dodge.

https://www.knowyourparts.com/techni...brake-booster/

Here's some more information.

https://www.brakeandfrontend.com/ope...ssist-systems/
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