Brake pedal and brakes lights

L.W.JONES

MEMBER
1994 DODGE DAKOTA
V6
2WD
AUTOMATIC
124,324 MILES

The brake lights stay on while the truck is running and the pedal sags, but if I pull up on pedal the lights go off. Also from the pedal area I can here a vacuum sound, but when I pull the pedal up, it lets up?

Saturday, March 12th, 2016 AT 11:11 PM

8 Replies

MHPAUTOS

MECHANIC
31,938 POSTS

It sounds like a leaking brake booster check this out, the vacuum noise can only be coming from the booster.

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Sunday, March 13th, 2016 AT 12:03 AM

L.W.JONES

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10 POSTS

Thanks that is what I thought, the booster is making the vacuum noise. Bad booster? Or fixable?

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Sunday, March 13th, 2016 AT 12:10 AM

MHPAUTOS

MECHANIC
31,938 POSTS

Not worth the time or money these days doing self repairs on these units, go get a new or change over booster this will be quicker and in the long term cheaper fix.

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Sunday, March 13th, 2016 AT 12:18 AM

L.W.JONES

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10 POSTS

Thanks for your time and help.

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Sunday, March 13th, 2016 AT 12:21 AM

L.W.JONES

MEMBER
10 POSTS

Will my master cylinder need to be replaced, or can I test it and use the old one?

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Sunday, March 13th, 2016 AT 12:45 AM

MHPAUTOS

MECHANIC
31,938 POSTS

When you remove the master just make sure that the rear seal is not leaking fluid, if it is dry it will be fine to reuse, if leaking replace the master as well.

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Sunday, March 13th, 2016 AT 3:01 AM

L.W.JONES