1999 Chevy Lumina noises when I brake

JBRASFIELD

MEMBER
1999 CHEVROLET LUMINA
6 CYL
FWD
AUTOMATIC
136,000 MILES

When braking I hear a clicking noise in the engine compartment that sounds like a relay. At the time of the clicks the dash panel lights dim like there is a short in the system. On occasion the engine has stalled with my daughter. I have tried but cannot get it to stall. I do here the clicking.

Saturday, November 21st, 2009 AT 9:32 AM

3 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

Hi there, thank you for the donation,

The first thing I would do is fins a quiet stretch of road, remove the brake light switch or unplug the brake light and see if this stops the click, this will isolate the electrical, also check that the booster is sound and not leaking, as if it is the resultant vacuum leak under braking may be the cause of the stall condition, start here.

Mark (mhpautos)

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Saturday, November 21st, 2009 AT 9:17 PM

JBRASFIELD

MEMBER
2 POSTS

I have already disconnected the ABS connectors on the master cylinder. With them disconnected I get no noises so I suspect either the ABS unit on the cylinder or maybe a bad sensor on a wheel. Thanks for the info, didn't think about just disconnecting the brake light switch to isolate the electrical. Guess I need to get a book and read up on ABS

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Saturday, November 21st, 2009 AT 10:30 PM

MHPAUTOS

MECHANIC
31,937 POSTS

The brake light switch side of things is just an idea to prove that there is no electrical back feed into another system through the switch operation, get a scan done to see if there is an internal sensor problem as well.

Mark.

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Sunday, November 22nd, 2009 AT 2:11 AM