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2002 GMC Sierra RPM and volts drop when braking

Tiny
CHRIS7474
  • MEMBER
  • 2002 GMC SIERRA
  • V8
  • 2WD
  • AUTOMATIC
  • 90,000 MILES
When braking volts drop and rpm drop. I have to put it in neutral and rev it to keep it running. I had to replace battery and alternator and still doing it. Any answers?
Thursday, January 14th, 2010 AT 10:54 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
If the RPS's drop, that is most likely why the volts drop. Have you checked for a vacuum leak to the power brake booster?
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Friday, January 15th, 2010 AT 12:35 PM
Tiny
CHRIS7474
  • MEMBER
  • 1 POST
Checked vacuum lines and tested. Everything good. Still wants to stall when braking.
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Saturday, January 16th, 2010 AT 12:14 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
When you come to a stop, does the engine act like a vehicle with a standard transmission not having the clutch pushed in, or does it just slowly die without the vehicle stopping completely? Also, have you vacuum tested the brake booster?
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Saturday, January 16th, 2010 AT 12:39 PM

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