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machine gun brake pedal

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eschneider

eschneider

Jedi Warrior
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I was driving my niece's 95(-ish) Lexus this weekend and experienced a rather disconcerting issue with the brakes. They felt fine until we slowed to an almost-stop, when the pedal vibrated/pulsed rapidly and made an audible rattling noise. Kind of like a machine gun. It only did this when almost to a stop, regardless of pressure (no difference between slow stop / panic stop). It's not a cv joint noise.

In 15 years of working on cars, I've never felt anything like this before, but my gut is that it has something to do with anti-lock brakes. Anyone else seen / experienced this?
 
Check the antilock brake sensors. Seems the system thinks the wheels are slipping and you are on full brake lock. Might bleed the system heavily to get the dirt and moisture out. Probably never been bled in 8 years.
 
:iagree:

Sensors are sending a false signal for some reason.
 
What Doc said.... Unless they we reacting to an actual issue with the road surface? Stop lights for instance tend to get diesel spilled when trucks brake hard and fuel sloshes around. That stuff is as slick as gorilla-snot. Try the car on a different section of road that you know to be dry, if the issue reappears then there's a problem, if not it was the road surface at that location.
 
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