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80 brat brake issue


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hi,

 usually due to air in line somewhere causing unequal pressure to either side,   but a couple of other things.   there is a nub on the back of the piston side pad , on each side of the vehicle,  it has to fit inside the recess on the caliper piston,  i have seen brakes come apart  and the piston was not turned to the correct position and the nub caused the pad to " not lay flat " on the piston,, bad and unequal friction on that pad.    the caliper has to be able to move fairly easily on the guide pins , sometimes that is overlooked, , maybe one of the pad retainer clips kicked out of place and is causing the pad to wedge a little.  oil, grease, or brake fluid on the pads?  did the rotors get turned or were they glazed? 

 rebleed the lines and if it still has an issue you gonna need to go back in and inspect.

Edited by ruparts
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Then something changed.  Air in the brake lines is unlikely.  A sticky pin is very possible. 

 

Pull it apart and inspect.  Clean and grease the pins.  Look for leaky brake lines.  Maybe a clip has come loose and the pad is cocking.  It only take a few minutes, but I know, it is really cold outside!

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If they are not sliding freely, they will be unpredictable as hell.

 

tear both side apart, clean them up, and grease them correctly.    Problems should go away.

 

 

If not, the caliper pistons themselves might be corroded to the point that they are starting to seize in the bore of the caliper.

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