possible brake booster issues

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Dec 17, 2016 | 05:51 PM

Mentor70

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Joined: Dec 2016

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possible brake booster issues

Greetings, i am new here! hopfully i can find someone that had been down this road.

i have a 1977 F100 that ive been restoring over the last year.

i totally redid the brake system, with a reman booster, all the way to the rear wheel cylinders.

i have a new engine installed along with a AEM wide band 02 for tuning.

today i was messing with the carb, (holley 650)

when i started my AF ratio was 11.9 after engine was warm. i adjusted the mixture screws until i had around 13.8-14.2 after i did this i noticed when i stepped on the brakes the engine would go so lean, it was off the charts and the engine would stall.

is my reman booster a POS, or could it be something else?

thanks, Duane

Dec 17, 2016 | 06:57 PM

flowney

Cargo Master

Joined: Jun 2014

Posts: 2,217

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From: Central Florida

If you can, let's add some vacuum gauge data to this story. The power brake booster feeds off vacuum so that's where we want to start looking. The hypothesis is that carb adjustments have decreased vacuum and, thus, starved the power brake booster.