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I recently lost brake pressure on a Dodge Ram I recently bought from a guy. Started it up and pedal went to the floor. When I checked the reservoir, it was nearly empty. Any ideas what it could be?

Completely replaced rear shoes and drums. Front pads still good. Bled rear but left front alone since they still looked good. Refilled the reservoir and now it stays full but still no pressure, even if I pump the brakes a few times.

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Would try bleeding master first if it was empty there is probably air in master

Posted on Apr 23, 2015

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Master cylinder needs replacing

Posted on Apr 23, 2015

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1 Answer

Why do I have good brake pressure when turned off but no pressure with car started?


With the engine running there is piece of assistive technology called a 'brake servo'. This amplifies what you do to the brake pedal and amplifies it to the four brake calipers and the hydraulic pistons inside them. When the engine is off, you are operating the brakes manually which is why you feel all that pressure.

You brake lines have either got air in them and need bleeding, or your brake servo is faulty.

This is a bit of an infomercial but explains.
http://youtu.be/L0oUejw5Edc

This is the traditional two-person way
http://www.popularmechanics.com/cars/how-to/a1495/how-to-bleed-brakes/


How Power Brakes Work HowStuffWorks

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1 Answer

Intermittent loss of brake pedal,only happned three times but customer says it went to the floor


If this is a hydraulic brake system, the first thing to do is to check the brake fluid level in the reservoir. Assuming that it is not down, the problem will probably be in the master cylinder. Try pushing the brake pedal down very slowly. This will not put a lot of pressure on the seals in the master cylinder, and if there is a problem, the brake fluid will leak past the seal allowing the pedal to go slowly to the floor. If you push the brake pedal down rapidly, the pressire on the seal will hold it against the master cylinder wall, and the brakes will hold fine.
If the fluid level in the reservoir is low, look at all of the wheels and slave cylinders to see if you can locate a leak. I don't suspect a leak based on your description of the problem, but it's worth checking.

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1 Answer

My truck leaks brake fluid after being shut off?


i think there could be air in the system and it takes a little while to work back to the reservoir and the release of the air is pushing out the fluid. try bleeding the entire brake system from each wheel to the master cylinder see if it stops it

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1 Answer

Cluch pedal lost pressure


The clutch master cylinder reservoir is on the firewall under hood near the brake master cylinder. It has a round black screw on cap as I recall. Use Dot 3 or 4 brake fluid.

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Breaks went out 2006 grand caravan. first lost power brakes and pedal was hard to push then went to the floor now goes all the way down and wont build pressure. checked all lines its full of fluid with no...


IT sounds like your brake mastercylinder has went out so what you need to do is get a new mastercylinder and replace that and bleed out the whole brake system after you put on the new mastercylinder.

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I have a 2003 Chevy Silverado 2500HD LT with Duramax Diesel. I have recently lost all brake pressure and can depress brake pedal all the way to the floor. My ABS light came on yesterday while spinning...


Unless you really know what you are doing it is best to get a mechanic to repair this. People's lives and safety are at risk and you could be held legally if something went wrong with your repair job. I would not touch it.

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2 Answers

No pedal on brakes, when I push brake pedal to the floor I hear a hissing noise in the cab of the truck (96 Dodge Ram 1500)


Had the same problem. I just replaced the brake booster unit, had a vaccuum leak out of where the push rod goes in. Solved.

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sounds like you have low brake fluid pressure and the pressure sensor is turning on warning lights saying there is low pressure and also pedal going to floor indicate this, sounds like master brake cylinder is worn out/broke and needs replace ment

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1 Answer

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sounds to me like your accelerater cable broke. can be bought at napa or most reputable parts stores

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