ABS Code 21 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-29-2006, 01:46 PM   #1
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Default ABS Code 21

I pulled a code 21 from my abs system... so, the main valve is having problems... is the main valve located in the master cylinder? I'm hoping so, since I'm going to pull a master cylinder from a good donor today...
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