The power brake booster has vacuum applied to it in order for it to boost your brake pedal effort. Sounds like the diaphragm in the booster is ruptured. The booster is the big round thing behind the master cylinder (where the brake fluid goes). You will very likely need a new booster.
i change master cylinder and booster and notig change
When my lights are on , and I press brake pedal, the driver side tail light turns off
2006 Dodge RAM 1500 Laramie Quad Cab 4WD
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Maintenance & Repair
My left rear brake light and turn signal do not work. The taillight works fine, and it's the same bulb as the turn signal and brake light. All other turn signals work fine, so it's not the flasher o...
1995 Dodge RAM 1500 Laramie SLT LB RWD
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Maintenance & Repair
Pressing the brakes and hear suction from under the dash area
1997 Dodge RAM 1500 Laramie SLT Club Cab LB 4WD
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Maintenance & Repair
I have a Dodge Ram 1500 had brake issues and replaced the rear brakes , lines , cylinders and power booster. Brake pedal gets hard with truck off but goes soft when started I bled the system made...
1997 Dodge RAM 1500 LT RWD
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Maintenance & Repair
I have a 2000 Dodge Ram 1500 brake front brakes dragging replaced caliper brake lines rotors pads master cylinder all new fluid still sticking what else could it be
2000 Dodge RAM 1500 SLT Club Cab RWD
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Maintenance & Repair
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