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

ScottyP
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ScottyP Enthusiast

ScottyP

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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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ScottyP Enthusiast

ScottyP

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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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ScottyP Enthusiast

ScottyP

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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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Gonzo Grand Master

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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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  • Have you checked out Joe's Latest Blog?

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         5 comments
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