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Why did the steering & brakes fail on starting? on 2005 Chevrolet Silverado 2500 HD

On starting 2500 duramax 4x4, noticed loss of power steering & brakes. Ist time, when I opened power steeering fluid cap, some fluid spurted out. Put cap back, restarted engine, problem rectified. It has happened again, this time no fluid spurting out, but revved engine & problem rectified. Any advice as to why this is happening & what needs to be fixed/replaced?

Asked by for the 2005 Chevrolet Silverado 2500 HD
MOST LIKELY BAD HYDRABOOST BEHIND MASTER CYL
1 more answer
Your truck may have hydroboost power brakes. That system works from hydralic pressue from power steering pump. Likely it may have a belt tensioner that is worn or some reason belt slips when its cold. Inspect drive belt and tensioners for wear.
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