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Old 05-05-2014, 10:09 PM   #1
Jensen_75
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Issue with NEW rear calipers

The short of it is I bought new rear calipers. Installed and went about bleeding them but I did so as if it was like the front calipers. I understand now that this is not how they can be bled. From what I have read you need to apply brake force and actuate the parking brake several times to get the piston to travel out. I have tried this at least 50 times to no avail. My brake pedal travels halfway to the floor before braking and I have reduced braking force. My ebrake takes twice as much to actuate as before changing the caliper. I searched the forum and the internet and found procedures to reset the piston to change pads but nothing for first time setup or bleeding procedure. I would like to know what I need to do as a first time setup to get the piston to extend and meet the rotor. I have purchased the tool to rotate the piston if needed but If I dont have to take off the wheels and take the caliper off again that would be awesome.

Thanks in advance.


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Old 05-06-2014, 09:34 AM   #2
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Replace or open up the brake system & you'll need to bleed the system. Do the rr & lr & then the rf & then the lf. If after bleeding & pumping the pedal, still have issues, I'd try removing the caliper & check it out. It takes a bit to get the piston to compress the pad to the rotor. I've had that issue too w/ just replacing pads & compressing= screwing in the piston.
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Old 05-06-2014, 12:49 PM   #3
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Quote:
Originally Posted by felixthecat View Post
Replace or open up the brake system & you'll need to bleed the system. Do the rr & lr & then the rf & then the lf. If after bleeding & pumping the pedal, still have issues, I'd try removing the caliper & check it out. It takes a bit to get the piston to compress the pad to the rotor. I've had that issue too w/ just replacing pads & compressing= screwing in the piston.
Thanks for the response. I did bleed the system as you described. I think my best bet is to get it started with the tool and make sure the ratcheting action works.
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Old 05-06-2014, 02:04 PM   #4
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Moved to "Brakes, Suspension & Chassis".
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Old 05-06-2014, 06:55 PM   #5
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last set I did on a GM , Regal ?? with parking brake integrated into the caliper

Make sure piston is engaged with lugs/ pins on back of the pad to keep the piston from turning
Set parking brake repeatedly , I think GM said 75 or 100X
Bleed brakes as normal
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Old 05-06-2014, 07:24 PM   #6
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Quote:
Originally Posted by rexazz2 View Post
last set I did on a GM , Regal ?? with parking brake integrated into the caliper

Make sure piston is engaged with lugs/ pins on back of the pad to keep the piston from turning
Set parking brake repeatedly , I think GM said 75 or 100X
Bleed brakes as normal
Sounds like a workout. I went under the car and I think the culprit is the left rear caliper. The parking brake is almost all the way retracted compared to the other side which is halfway. I made sure when I assembled the pads that they went in correctly. The set I pulled out hand an angle to them and the little tab was sitting on the face of the piston instead of in one of the recesses. I wonder if that was the cause of my brake vibration.
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Old 05-06-2014, 10:19 PM   #7
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Ooh that would be an issue for sure, and an answer to the soft pedal.
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Old 05-06-2014, 10:43 PM   #8
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Ooh that would be an issue for sure, and an answer to the soft pedal.
If you mean the parking brake comment I went under there with a bright light and I was mistaken. With the ebrake up the two sides relative to each other look a little different. However when I take the cable off and try to rotate the mechanism, it is very hard to get any rotation other than the play in the mechanism. Could be deceiving but I actually believe that it is functioning correctly.

I get my lug nut tool back tomorrow. I will check everything and bleed the system again if I can find someone to help.
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Old 05-06-2014, 10:54 PM   #9
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Quote:
Originally Posted by Jensen_75 View Post
The set I pulled out hand an angle to them and the little tab was sitting on the face of the piston instead of in one of the recesses. I wonder if that was the cause of my brake vibration.
I was thinking about this part in particular. When they don't fit together square & tight you get flex that feels like a system that still has air in it.

IF you saw them flex while someone pushed the pedal with them installed that way it would be more obvious - hope fixing that is at least a step toward getting them right.

Luck
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Old 05-07-2014, 09:22 AM   #10
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Try getting a friend to press the brake pedal while you look at each rear brake. See if you can tell how the calipers are working. Then again have them work the hand brake, the hand brake is independent of the pedal, might be able to trouble shoot which is causing issues.

The parking brake line tension can be adjusted at the handle if you take off the center console, there is an adjustment screw there. I know i had to adjust mine some when i added rear discs but since you were just replacing the existing rear calipers, that shouldnt be an issue.

From the initial post, sounds like the system wasnt bled all the way. Did the reservoir ever fully drain?
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