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1997 GMC sierra 2500 4x4 diesel no power assist on steering or brake


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pastorj
New User

Jun 9, 2009, 1:28 PM

Post #1 of 6 (3264 views)
1997 GMC sierra 2500 4x4 diesel no power assist on steering or brake Sign In

I have a borrowed truck matching the description given in subject that has developed a major problem. Everything was working fine when I shut it off but 30 minutes later I started it up and discovered that I no longer had power steering or power assist on the brakes. I have checked the in vehicle manual for fuses and relays that may be related and have found nothing named that I can see. there was one fuse blown but it was only relating to the horn. What am I missing? Are both of these systems assisted by a common component and if so where do I find it?


Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Jun 9, 2009, 4:45 PM

Post #2 of 6 (3255 views)
Re: 1997 GMC sierra 2500 4x4 diesel no power assist on steering or brake Sign In

pastorj; Check the belts. Some diesels use the power steering pump belt for hydro-boost for the brake power assist.
Loren
SW Washington


Sidom
Veteran / Moderator
Sidom profile image

Jun 9, 2009, 6:46 PM

Post #3 of 6 (3254 views)
Re: 1997 GMC sierra 2500 4x4 diesel no power assist on steering or brake Sign In

Those pump have also been know to break the shaft. Loosen the belt & tug on the pulley, if the shaft slips out, it's broken.....


pastorj
New User

Jun 11, 2009, 9:19 AM

Post #4 of 6 (3241 views)
Re: 1997 GMC sierra 2500 4x4 diesel no power assist on steering or brake Sign In

It looks like the advice was right on. I released tension on the belt and tried to move the pulley in and out. There is about 1 inch play in the shaft so I am concluding that the power steering pump is broken. There are high pressure lines connected to the master cylinder from the pump so I guess that is the power assist for the brakes. I guess this wasn't an electrical problem at all, thanks for the help.


Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Jun 11, 2009, 3:46 PM

Post #5 of 6 (3238 views)
Re: 1997 GMC sierra 2500 4x4 diesel no power assist on steering or brake Sign In

Sidom; Another good call! And, another gold star! If I could only find one!Unsure

Here Loren>>>>>>>>>
Loren
SW Washington

(This post was edited by way2old on Jun 11, 2009, 3:59 PM)


Sidom
Veteran / Moderator
Sidom profile image

Jun 11, 2009, 7:28 PM

Post #6 of 6 (3230 views)
Re: 1997 GMC sierra 2500 4x4 diesel no power assist on steering or brake Sign In

I'm sure ya got plenty stashed way Loren...Wink

Looks like you found the problem Pastor..... You are correct about the brk power assist.
Thats a hydraboost system that uses the p/s pump. That tough luck just borrowing the
truck & that happening.

Do realize tho that this had nothing to do with what you did & would have happened to the owner anyway, you just had bad timing.....Unsure






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