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Old 05-16-2009, 03:49 PM   #1
BGPunk2001
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Default Anyone know how to release the pistons in the rear calipers of this vehicle?

I was doing a brake job on my wife's 2006 Buick Lacrosse. I replaced the fronts just fine, but I took one of the rear calipers off and I can't compress the piston back into the caliper. After speaking to someone I have been told that because the parking brake system is built into the caliper, there is a ratcheting mechanism that has to be released.

I have the car in pieces and now I can't even get the calipers back onto the old brake pads. The car is currently dead in the water till I cen find out how to do this.

Does anyone know how to release the ratcheting mechanism in the rear brake caliper?
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Old 05-16-2009, 03:51 PM   #2
Kiel
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Sometimes on the backside of the caliper there's a bolt/hex you need to spin to release or retract the ratcheter. Well, thats how it was on my Mazda. Check around on the caliper in the back for any sort of unusual looking bolthole?
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Old 05-16-2009, 03:57 PM   #3
The Dayman
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I know some Nissans the piston has to be twisted back in on the rears. Could be the same.
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Old 05-16-2009, 03:58 PM   #4
Clothesoff
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Bigger hammer.
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Old 05-16-2009, 04:02 PM   #5
gmtech111
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There is a special tool you need to compress the piston. You can try and turn the piston clockwise with a pair of pliers or turn it by the two notches on the face of the piston and see if it screws in, otherwise you will need the tool.
Note: there is no release, the piston must be screwed back in
Good luck

Last edited by gmtech111; 05-16-2009 at 04:04 PM. Reason: note
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Old 05-16-2009, 04:02 PM   #6
Kiel
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Quote:
The rear caliper pistons must be screwed back into their bore, using a special tool,

Retract the brake caliper piston (2) into the brake caliper bore. Use a suitable spanner type wrench and turn the piston clockwise until it bottoms out fully in the brake caliper (MacŪ Tools DBC 25 C 2500 MA Disc Brake Caliper Tool Set, or equivalent).

Align the indents on the piston face to match the pin on the back of the inboard brake pads.
OK, so the piston has to be turned with a brake tool (or a wrench) to get them to back in.
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Old 05-16-2009, 04:07 PM   #7
BGPunk2001
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Oh, you guys are ****ing awesome. I was afraid I was about to have to tow it to the brake shop.



I <3 YOU OT!!!!

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