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Changed front brakepads MAYHEM !!!

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Old Dec 6, 2025 | 02:47 PM
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Default Changed front brakepads MAYHEM !!!

Hello , i just changed the front brakepads (on my '19 UX250H) , pushed the pistons back and reinstalled my calipers .... nothing more .... pumped the pedal after reinstalling the calipers ( basic job )
BUT !! i go to run the car outside and all hell has broke loose in my dash !! LOW BRAKE PRESSURE ..... EPB FAILURE ..... CHECK ENGINE ..... PULL CAR OVER TO A SAFE AREA AND CALL DEALERSHIP !!! LOLLLL WTF !! the car runs fine , brakes fine .... but it is BEEPING NONSTOP !!! i'm going to pull the codes .... but this is MAJOR WEIRD !!! i suspect there is a vaccum pump is this possible ?? and it decided to stop working !?!? there is no brake booster like in a normal car ....might a vaccum pump replace this booster by chance ?? i'm at a loss .... please help me !!
Don
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Old Dec 6, 2025 | 03:23 PM
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Originally Posted by Don64
Hello , i just changed the front brakepads (on my '19 UX250H) , pushed the pistons back and reinstalled my calipers .... nothing more .... pumped the pedal after reinstalling the calipers ( basic job )
BUT !! i go to run the car outside and all hell has broke loose in my dash !! LOW BRAKE PRESSURE ..... EPB FAILURE ..... CHECK ENGINE ..... PULL CAR OVER TO A SAFE AREA AND CALL DEALERSHIP !!! LOLLLL WTF !! the car runs fine , brakes fine .... but it is BEEPING NONSTOP !!! i'm going to pull the codes .... but this is MAJOR WEIRD !!! i suspect there is a vaccum pump is this possible ?? and it decided to stop working !?!? there is no brake booster like in a normal car ....might a vaccum pump replace this booster by chance ?? i'm at a loss .... please help me !!
Don
I'm curious what codes show up. Hope you can just clear them.

On my Corvette, the negative battery cable needs to be removed before bleeding fluid or replacing brakes. Can be issues with some sensors if still connected. No idea why they make everything so hard now.
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Old Dec 6, 2025 | 03:26 PM
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Originally Posted by sjw91
I'm curious what codes show up. Hope you can just clear them.

On my Corvette, the negative battery cable needs to be removed before bleeding fluid or replacing brakes. Can be issues with some sensors if still connected. No idea why they make everything so hard now.
Its just getting more and more complicated to work on vehicles ... i am a certified industrial mechanic , not as if it was my first BBq .... i repair forklifts daily !!
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Old Dec 6, 2025 | 03:49 PM
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Originally Posted by Don64
Its just getting more and more complicated to work on vehicles ... i am a certified industrial mechanic , not as if it was my first BBq .... i repair forklifts daily !!

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Old Dec 6, 2025 | 04:01 PM
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holy **** ..... my bad .... never disconnected battery at al , just after my issues surfaced ....needles to say .... MISTAKE !!! this is getting stupid crazy .... REALLY !!! LOLLLLL
i have already changed my service battery last wiinter without a hitch ...
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