Brake Booster Question

By Bruce123
April 13, 2011 in Ask A GM Technician

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Bruce123

Posted April 13, 2011

On my 09 Silverado there is an electronic item attached to the bottom of the booster chamber. I cannot read the numbers but it does say Bosch. I think 4 wires go to this part. What is that part and what is it's purpose.

Thanks

Bruce

redvett

Posted April 14, 2011

A picture would be nice but my guess if its a #1500 its the aux vacuum booster pump.

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