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Re: power steering and power brakes failed
Check to see if the power steering reservoir is full and the belt is intact.I'm assuming that you have a hydroboost unit where the p/s works the brake booster. If those are ok you could have a bad p/s pump
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You have a vacuume line that has failed probably in the engine compartment. Look for a hole in a line or a line off . If you cant find a line off you r brake power booster may have gone bad. if this was helpful please leave good feed back
I know GM decided to run the brakes and power steering vacumm all off of the power steering pump on some of their trucks. This could really be a big problem because if your power steering quit it would stop supplying your brakes with vacuum to stop the truck. In my experience I would check out the situation with the steering pump. Change it for a new one. Don't take any chances on smashing your truck.
It would sound like you have lost a serpentine belt. Do you have a braking system that is boosted by the power steering pump? While it is possible for a pump to fail it is rather unusual to do so suddenly. Unless the systems have something in common (like the power steering fluid) it is highly unlikely both systems would fail for no reason simultaneously. Did any other warning lights or an alternator gauge or temperature gauge give you any indications of a problem?
In a lot of GM and Chevys the intermediate steering link will lose grease and cause a clunk-like feeling while turning and braking. There is a TSB for such a problem. The dealer may still warranty the repair. You can take your truck into a local shop and they'll shake down the front end for about 1/2 hour labor to see if anything is wrong. About 80% of the time a pull is caused by a lateral tire pull or even a bad tire. Check your air pressures as well.
Mine just did same (2001). Have them check the power steering pump--shaft broke in mine. This affects the brakes as well since both power brakes and power steering run off same system in Astros. Broken shaft messed up the booster system.