New hydroboost, now break light on - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

 
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post #1 of 7 (permalink) Old 09-02-2019, 06:08 PM Thread Starter
 
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New hydroboost, now break light on

I just replaced my hyroboost and now my break lights will not turn off? WTH! break light switch?
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post #2 of 7 (permalink) Old 09-02-2019, 06:11 PM
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Did you install the switch back correctly?

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post #3 of 7 (permalink) Old 09-02-2019, 06:26 PM Thread Starter
 
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Hmm, pretty sure I did. Now i'm second guessing myself. The retainer clip did break on removal. I was still able to get the clip back on but it wasn't easy. I ordered a new clip and will install tomorrow.
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post #4 of 7 (permalink) Old 09-03-2019, 04:00 AM
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some have had this issue if they install a HB for an LML on an LMM. You have to ream out the end of the arm that attaches to the brake pedal lever to get the play required for the brake switch to operate correctly.

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post #5 of 7 (permalink) Old 09-03-2019, 10:56 AM Thread Starter
 
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Quote:
Originally Posted by 407driver View Post
some have had this issue if they install a HB for an LML on an LMM. You have to ream out the end of the arm that attaches to the brake pedal lever to get the play required for the brake switch to operate correctly.
This went on a LLY. I do plan on replacing the break light switch to eliminate this issue.
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post #6 of 7 (permalink) Old 09-03-2019, 10:41 PM
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New brake light switch or not, you need to understand how the switch is activated. As mentioned above, the hole in the shaft from the HB needs to be elongated as it fits on the pin from the brake pedal arm. As you press on the pedal, the first little bit, the slop of the pin in the hole, is what activates the light switch. It's awkward to lay under there and see how it works, and if it's working properly.

And, yeah, I mangled the clip and had to put on a new one, too.

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post #7 of 7 (permalink) Old 09-18-2019, 04:45 PM Thread Starter
 
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Sorry for not getting back sooner, so the break lights started working with the old switch. I didn't have to replace it after all.
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