Brake issues - Dodge Cummins Diesel Forum
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post #1 of 9 (permalink) Old 06-13-2019, 09:47 PM Thread Starter
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Brake issues

I was driving yesterday and all of a sudden I lost power steering and brakes were hard and had to push way down to get them to stop. So some research I replaced the Power steering pump today. That seemed to fix the steering and now I can turn it easily. Drove it around and seemed to get all the air out of it however my brakes are still not good. Since the steering is good what else could be the issue with the brakes?

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post #2 of 9 (permalink) Old 06-13-2019, 09:59 PM
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you could have a leak in your hydroboost and/or air still in there

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post #3 of 9 (permalink) Old 06-14-2019, 12:01 AM Thread Starter
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Thanks. I'll drive it around a little more tomorrow and see if it gets any better.
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post #4 of 9 (permalink) Old 06-14-2019, 08:27 PM Thread Starter
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Well still the same. The truck stops but pushing hard on the brakes and I get a hard pedal. Would the brake booster cause issues like this?
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post #5 of 9 (permalink) Old 06-15-2019, 12:38 AM Thread Starter
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I guess I'm not totally sure how these brakes work. There's a vacuum pump and a hydroboost. So if I'm not mistaken the PS pump pushes fluid to the Hydroboost to supply braking power correct? So what does the vacuum pump do for the brakes besides spin the PS pump? The vacuum it provides is just for the HVAC stuff right or does it affect the brakes as well?
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post #6 of 9 (permalink) Old 06-15-2019, 06:28 AM
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Vacuum is not related to brakes at all.

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post #7 of 9 (permalink) Old 06-15-2019, 04:15 PM
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The power steering pump powers the hydroboost system. The vacuum pump has nothing to do with either but merely is connected to the PS pump for a drive source.

If you're having trouble with the hydroboost system and/or the PS system then always check the PS fluid condition and level first. Its a small capacity system and the hydroboost runs hot so it degrades the fluid. Its best to run a quality synthetic PS fluid too.

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post #8 of 9 (permalink) Old 06-16-2019, 10:50 AM Thread Starter
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Thanks guys. After thinking about it that's what I figured. I've got time today I'm going to try and bleed the system a little more and see what I can figured out.

I read that with the truck off if I pump the brake a few times and then put pressure on it. When I start the truck the pedal should go down and then come back up. That determines if the Hyrdroboost is working correctly. Mine does not do that, so I guess it could be bad as well.
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post #9 of 9 (permalink) Old 06-16-2019, 11:14 PM Thread Starter
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Turns out it just had air in it.
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