How do I compress caliper piston - Pontiac G6 Forum
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post #1 of 20 (permalink) Old 08-30-2008, 08:03 PM Thread Starter
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How do I compress caliper piston

2005 G6. I am trying to replace rear disc brakes. I cant compress piston to go over new pads. I have tried a C clamp I just bent handle trying to turn.
I dont see anyplace for a hex socket to turn piston. I just see 2 notches on piston. How do I compress piston? Please help
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post #2 of 20 (permalink) Old 08-31-2008, 07:40 AM
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post #3 of 20 (permalink) Old 08-31-2008, 07:50 AM Thread Starter
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OK, I have found it turns. Simple job saved 100 dollars
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post #4 of 20 (permalink) Old 08-31-2008, 09:38 AM
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Tell us where were they?




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Last edited by geewhiz; 11-17-2008 at 11:11 AM.
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post #5 of 20 (permalink) Old 09-02-2008, 07:11 AM
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Tell us where were they?
For the rear you need to turn the piston as you crank with the C clamp. It's a lot easier with the right tool. Any good parts store has the tool.

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post #6 of 20 (permalink) Old 09-14-2008, 09:44 PM
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The tool to use is a universal brake caliper tool, I picked mine up from Pep boys for $10 bucks. The tool fits on a socket wrench and you turn it clockwise to depress the piston into position.
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post #7 of 20 (permalink) Old 10-08-2008, 04:44 AM
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I just used a pair of sturdy needle nose pliers to get int the groves and twist, no pressure needed.
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post #8 of 20 (permalink) Old 10-09-2008, 03:22 PM
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Quote:
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I just used a pair of sturdy needle nose pliers to get int the groves and twist, no pressure needed.
There you go ...One has to be creative
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post #9 of 20 (permalink) Old 10-10-2008, 11:51 AM
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Wow, i'm glad i read this...I just did my front brakes two weeks ago and plan on hitting the rears this weekend and I probably would have screamed obscenities throughout the neighborhood trying to do it without knowing to turn the piston!!
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post #10 of 20 (permalink) Old 10-19-2008, 09:46 PM
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Wow, i'm glad i read this...I just did my front brakes two weeks ago and plan on hitting the rears this weekend and I probably would have screamed obscenities throughout the neighborhood trying to do it without knowing to turn the piston!!
Or worse..... broke them!!!
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post #11 of 20 (permalink) Old 10-20-2008, 10:40 AM
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Indeed! I would be doing more than screaming obscenities then! Hahhaha
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post #12 of 20 (permalink) Old 10-24-2008, 07:49 PM
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Its a Borg tool. Costs about $11 at any corner auto parts store.
Just match it to the piston and turn with your 1/2 socket wrench.



This is for the rear e-brake center piston- for those who dont know what we are talking about. =^)
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post #13 of 20 (permalink) Old 11-02-2008, 06:25 PM
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Ok, so how far should the piston go in? I used some needle nosed pliers and got in where about 1/8th of it was sticking out but when I finally got the pads in place and spread as far as the caliper assembly could go, the gap between was too narrow. It seems to me that the piston should reseat itself all the way back into the cylinder but it won't go any further. I am at a total loss here but will this borg tool help? Anything else as far as this goes would be really appreciated.
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post #14 of 20 (permalink) Old 11-07-2008, 09:52 PM
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Yes the piston will screw down to open it up easy cheesy- and use the tool not needlenose pliers.
Tork it down just enough to get the caliper back on. Once it is all bolted back up you will pull many many times on your e-brake handle to tighten the piston back up against the new pad.

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post #15 of 20 (permalink) Old 11-09-2008, 05:26 PM
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I used a bar clamp (Wood Clamp) and it worked perfect.
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