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99 gmc 3500, hydro boost, all 4 brakes lock up


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I've got a customer that has a 99 GMC K3500, 5.7, auto, with the hydro boost brake booster. His brakes are extremely touchy and lockup with very little pedal pressure. Brakes are almost new on all 4 corners. Before I replace the hydro boost unit just want to see if anything else could cause this problem. Power steering works fine, if anything it is also a bit sensitive.

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All 4 brakes lock up, they are very touchy and lock up with little pedal pressure. If you're not careful it will put you through the windshield!

 

Rears are drums and brakes front and rear are in very good condition. I did flush the power steering fluid as it was very old.

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  • 1 month later...

I just had this truck back in the shop for a different issue. Previously I had flushed the power steering fluid and after a quick test drive yesterday found the brakes to be working correctly, no more instant lockup so the flush did the trick.

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I've seen similar issues regarding the hydroboost. Contaminated pwr steering fluid or sticky valve in the hydroboost. If a flush fixed it, you probably got lucky. Watch for the problem to sneak up on ya again when the summer time heat starts to come around. If so, then you'll need to look at the hydroboost again.

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      It always amazes me when I hear about a technician who quits one repair shop to go work at another shop for less money. I know you have heard of this too, and you’ve probably asked yourself, “Can this be true? And Why?” The answer rests within the culture of the company. More specifically, the boss, manager, or a toxic work environment literally pushed the technician out the door.
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      Shop owners: Focus more on employee retention than acquisition. This is not to say that you should not be constantly recruiting. You should. What it does means is that once you hire someone, your job isn’t over, that’s when it begins. Get to know your technicians. Build strong relationships. Have frequent one-on-ones. Engage in meaningful conversation. Find what truly motivates your technicians. You may be surprised that while money is a motivator, it’s usually not the prime motivator.
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