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Discussion Starter #1
I have a 2000 GC, the driver of which complains that the brake pedal is squishy and later the brake pedal is hard. Additionally, during normal braking, on dry pavement, the ABS unit fires up.

The vehicle has a new master cylinder, and I replaced front pads and rotors 2 months ago, prior to these complaints. I noticed nothing abnormal during post-repair vehicle test drive.

Two nights ago, the brakes were bled again (boy was it hot and sticky that night, and the mosquitoes should have given me a red cross donors card). The vehicle was test driven, and behaved normally.

Yesterday, there was a complaint of ABS going off almost every stop, but not every stop.

My working hypothesis is that one or more sensors for ABS are failing, and that is the cause of the frequent ABS activations. Additionally, I have not verified that the vacuum booser valve is free and clear. Since they are fairly inexpensive, I may simply replace.

How does one identify which ABS sensor may not be functioning right?

Additionally, the shop manual suggests it is impossible to bleed ABS without a DRB unit. Is that the case, or are there some practical workarounds.

Thanks in advance for any guidance.
 
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