Zigzagging while breaking - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-11-2005, 12:10 AM   #1
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Default Zigzagging while breaking

been having a problem with my car ...it seems when i stop either lightly or hard the car zigzags back and forth....it'* only at speeds above 45...any ideas?


i just changed the brakes and rotors...think it'* a caliper?


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Old 10-11-2005, 03:38 AM   #2
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I think a sticking caliper might cause a zigzag stop. Did you check, clean, and lube the caliper pins and bushings when you changed the rotors and pads? How did the piston boots look on the calipers? Did you open the caliper bleeder when you pushed the piston back so you wouldn't send contaminated brake fluid back up to the reservoir?
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Old 10-11-2005, 09:15 AM   #3
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my dad did all that....don't remember how the boots looked


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Old 10-11-2005, 11:32 AM   #4
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Did the zigzag start right after the brake job?
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Old 10-11-2005, 09:41 PM   #5
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no...it was before....


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Old 10-11-2005, 10:26 PM   #6
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OK, my '92 FSM suggests that uneven braking action side to side may be caused by:
incorrect front end alignment,
loose front suspension attachments,
contaminated brake lining (like if you got some grease on the pads),
leaks from caliper piston seal,
missing or loose brake assembly attachments.
restricted brake fluid passage, (possibly a bad flex hose)
incorrect tire pressure,
sticking caliper piston

If you are not comfortable checking this stuff yourself, take it to a shop you trust. Brakes aren't something you want to guess about.
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Old 10-11-2005, 11:43 PM   #7
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it'* gotta be my tires, the alignment, or tire pressure.. checking now


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