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Discussion Starter · #1 ·
My powersteering and brakes went out on my truck, besides the vaccum pump is there anything simple that I can check? power steering out is self explanatory, but the brakes don't drop to the floor they are hard to push down at all. I have a 1999 Ram 2500 Quad Cab. Thanks!
 

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:welcome: It seems to me that the common component is the check valve on the brake booster. Check it first to see if there is a vacumn leak, and if necessary replace the check valve. That is a common cause of hard brakes, and is also associated with the vacumn to the power steering. Dang, does your avatar change every time.
 

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Tech Specialist
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I'm pretty sure those are hydroboost and if they are they are run off of the power steering pump. Change your power steering pump and I bet you get both back.
 

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i agree with big blue
 

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No, changing avatar is not a bad thing, I just wanted to make sure my old welsh eyes were not deceiving me

(1) Connect vacuum gauge to booster check valve
with short length of hose and T-fitting (Fig. 54).
(2) Start and run engine at curb idle speed for one
minute.
(3) Observe the vacuum supply. If vacuum supply
is not adequate, repair vacuum supply.
(4) Clamp hose shut between vacuum source and
check valve.
(5) Stop engine and observe vacuum gauge.
(6) If vacuum drops more than one inch HG (33
millibars) within 15 seconds, booster diaphragm or
check valve is faulty.

See the PDF file below for figures.

The hydraulic booster uses hydraulic pressure from
the power steering pump. Before diagnosing a
booster problem, first verify the power steering pump
is operating properly. Perform the following checks.
² Check the power steering fluid level.
² Check the brake fluid level.
² Check all power steering hoses and lines for
leaks and restrictions.
² Check power steering pump pressure.

I agree that the brake system is hydro, but there is a check valve on the booster that is one of the primary culprits in what you described as a hard brake peddle. Take a look at the file and you will see the check valve. As I said in the second paragraph it could be your power steering pump, but I would first check the valve, for a leak or bad valve. Much cheaper than PS pump.
 

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Discussion Starter · #7 ·
Thanks I will print that out, check the valve and the powersteering pump and then I will let you know. You "old welsh eyes are just fine! Thanks so much. I am glad that the weather is decent (it was snowing here yesterday), I have some work to do.
 

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I dont own a 99, mines a 01, BUT the vacuum system on my truck ONLY controls cruise control and the heater controls.
if you have lost both steering and brakes that means you have a hydroboost system.
you can have a bad power steering pump, or the shaft or coupling that connects the powersteering to the vacuum pump can be broken, or you can have a bad hydro boost.
Usually when the pump goes bad you might get some power steering or power brakes but NOT both at the same time, and sometimes only when the RPM's are raised.

if I had to guess and throw parts at it I'd start with the pump and go from there (pumps cheaper)
 

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THANKS!!! I am starting at the check valve and working my way to the power steering pump, it's gonna be a long weekend!
its gonna be a really long weekend if your trying to find that check valve :rof

The check valve is only found on a gasser truck
 

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all 2nd gen 24 vaves have the hydroboost. if you have a busted power steering line you will lose your brakes to. so if you figure out where the problem is it will fix both of them. i worked on one and it messed with my head untill i realized what was going on.
 

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My truck is a 98 and the brakes and steering went. The quick fix has been to add the Lucasoil power steering treatment? It has been working over a month so far.
 

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Mopar1973Man.Com
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Don't quote me but I heard there is a pickup screen in the PS pump that you can remove and clean... (Might be plugged up)

When was the last time you changed PS fluids??? And flushed the system?? :w:

Maintenance Schedules
 

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NickG, jsut for the record, the vacuum pump also runs the front axle disconnect.

My truck is having similar issues since i bought it. it had 68k when i first bought it and sometimes the petal was very hard and the rear end would lock up and usually the ABS kicked on, but after driving for a few minutes the brakes went back to normal. Then randomly on a road trip this weekend i started getting a real weird feeling in my steering like i had air bubbles in my PS. I was low in PS fluid so I added more and 500 miles later it seems ok, but the brakes still act up here and there. Especially wehn its been cold, let alone cold and wet. Ill have to check into this check valve deal as well, as i know my pump is good from testing. thanks!
 

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NickG, jsut for the record, the vacuum pump also runs the front axle disconnect.

My truck is having similar issues since i bought it. it had 68k when i first bought it and sometimes the petal was very hard and the rear end would lock up and usually the ABS kicked on, but after driving for a few minutes the brakes went back to normal. Then randomly on a road trip this weekend i started getting a real weird feeling in my steering like i had air bubbles in my PS. I was low in PS fluid so I added more and 500 miles later it seems ok, but the brakes still act up here and there. Especially wehn its been cold, let alone cold and wet. Ill have to check into this check valve deal as well, as i know my pump is good from testing. thanks!
My bad... I guess I should not have used the word "only". (and I forgot as well that it is also used for the front diff). thanks for the reminder. one test you can try is shut off the truck and apply the brakes you should have 2-3 brake applications, if the brake pedal goes hard the hyroboost needs replacing or a rebuild. typically when its cold out (and PS oil is cold) and the truck is started then shut off it will puke out the ps oil out of the resevor(but only if shut off while the oil is still cold) for this sometimes you can get away with syn PS oil and or park your truck in a heated garage
 
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