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Piston caliper wont retract

 
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Old 08-17-2009, 03:01 PM
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Piston caliper wont retract

On the rear right brake caliper the piston wont budge, Im trying to spin it clockwise but its pretty much stuck. I opened up the bleeder screw which didnt help, will getting the disc brake piston tool really make a difference or do the calipers have to be rebuild/replaced?
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Old 08-17-2009, 03:23 PM
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Re: Piston caliper wont retract

Here's a thought bc when I was changing the pads to the rears and had it jacked up and couldn't get the calipers off bc...I HAD THE E-BRAKE ON!!!

Maybe that's why it wont budge?!?!
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Old 08-17-2009, 03:43 PM
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Re: Piston caliper wont retract

I wish thats all that was

I tried using a crow bar like a big screwdriver but didnt get anywhere, Im running out of options
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Old 08-17-2009, 05:27 PM
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Re: Piston caliper wont retract

I bought the caliper piston tool. It's nice but basically unnecessary; a large enough flathead screwdriver (or other flat-edged metal tool) will do just as well. Are you sure that caliper core isn't locked up?
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Old 08-17-2009, 05:46 PM
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Re: Piston caliper wont retract

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Originally Posted by nutbar21 View Post
I bought the caliper piston tool. It's nice but basically unnecessary; a large enough flathead screwdriver (or other flat-edged metal tool) will do just as well. Are you sure that caliper core isn't locked up?
Well I went out and got the tool for 10 bucks, it is turning now, but its unbelievably tight. I mean 1 rotation took me 30 minutes, any idea what to do at this point?
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Old 08-17-2009, 05:49 PM
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Re: Piston caliper wont retract

Take it apart and clean and grease everything
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Old 08-17-2009, 05:52 PM
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Re: Piston caliper wont retract

had the exact same thing happen to me.. if there's a grinding sound when you drive and major wear on your brake pads, then the caliper is probably seized. it's easy and cheap enough to replace it yourself, and you'd probably have to get new brake pads too. but good luck!
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Old 08-17-2009, 06:00 PM
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Re: Piston caliper wont retract

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Originally Posted by sellier View Post
Take it apart and clean and grease everything
Is there a write up for this? My biggest concern would be letting too much brake fluid drip out and getting too much air in there. Any clever way to take off the 2 hoses?
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Old 08-17-2009, 07:17 PM
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Re: Piston caliper wont retract

Heres what I used as a guide when I did mine.
http://www.lukekailburn.com/caliperrebuild.html

You'll have to remove the caliper so you will be draining the brake fluid so read up on how to bleed the brake system.
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Old 08-17-2009, 08:07 PM
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Re: Piston caliper wont retract

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Originally Posted by sellier View Post
Heres what I used as a guide when I did mine.
http://www.lukekailburn.com/caliperrebuild.html

You'll have to remove the caliper so you will be draining the brake fluid so read up on how to bleed the brake system.
Thanks for the link, but I gave up on the caliper and just bought a new one for 70 bucks. Im just worried about unscrewing the 2 hoses and letting too much air into the line. How many bottle of brake fluid would you need to get the system back to normal after taking off the caliper?
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Old 08-17-2009, 08:12 PM
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Re: Piston caliper wont retract

I'd just buy the DOT3 tub from Wal-mart.
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Old 08-17-2009, 08:34 PM
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Re: Piston caliper wont retract

the rear piston is always a PITA to rotate back into place. i use a vice-grip everytime. your new caliper might be the same way, you just gotta put muscle into it.

your also gonna need to bleed the system anytime you expose it to air, so don't worry about how much air your letting in. you need to bleed it anyway.
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Old 08-17-2009, 08:50 PM
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Re: Piston caliper wont retract

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Originally Posted by twokexlv6coupe View Post
the rear piston is always a PITA to rotate back into place. i use a vice-grip everytime. your new caliper might be the same way, you just gotta put muscle into it.

your also gonna need to bleed the system anytime you expose it to air, so don't worry about how much air your letting in. you need to bleed it anyway.
This is how the rotor looked(only the inner part was making contact with the break pad).

http://img199.imageshack.us/img199/3491/disce.jpg


I needed so much force to turn the piston that the metal grooves were getting rounded off, on other cars it just required a very mild push to get the piston back in.
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Old 08-17-2009, 09:41 PM
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Re: Piston caliper wont retract

yea theres a special tool for that.
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Old 08-17-2009, 10:04 PM
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Re: Piston caliper wont retract

a good way to limit the amount of air that will get in is to open your resevoir and tip the new bottle of brake fluid into the resevoir so as the fluid drips out of the line after you've disconnected it, it will drain out of the bottle into the res and the line(s). Then, once you have the new caliper on, have someone pump the break pedal for you. Have them pump the pedal until it feels firm. I can't stress this enough, only allow the brake pedal to be pressed about half way down. This will prevent internal damge in the master cylinder. Once the pedal is firm, open the bleeder screw. The brake pedal will sink, so once again, have the person assisting you only ride the pedal to about the half way point. Keep doing that till all the air is out of the bleeder, and when you open it you only get brake fluid, no spurts of air. Then you should be all good.
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Old 08-18-2009, 02:14 AM
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Re: Piston caliper wont retract

get a rag and clamp off the brake line with vise grips. this will stop air from getting beyond that point, and fluid from draining out. hang your new caliper in place. re attach the hose and then do the method stated above. its pretty simple, should take maybe 1/2 an hour or so to bleed that line if you have never done it before.
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Old 08-18-2009, 12:14 PM
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Re: Piston caliper wont retract

If your gonna replace that caliper, see if your due for a brake flush anyways. If you decide to drain all the fluid make sure you keep topping up your master cylinder, other wise your gonna have to bleed that as well. Best way is to start draining farthest away from your master cylinder. so if your master cylinder is on the driver side, start withy the passneger rear tire, then the driver side rear tire, the the passenger front tire and then driver side front tire. Then when it comes to bleeding your brakes, its way easier with 2 people. one sits in the car pumps the brake alot and hold it. then crack the bleeder valve allowing the air to escape. Repeat on each caliper until all air is out and pedal becomes stiff. The process of starting at the brake farthest away from the master cylinder applies as well.

One or 2 bottles should be enough for the full flush. if you just worriying about that one brake, just get one bottle. and just bleed the brakes from the one caliper.
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Old 08-18-2009, 04:46 PM
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Re: Piston caliper wont retract

I cant seem to get the e-brake line off the caliper, there is a screw with a snap pin holding it to the caliper. I took the snap pin out, but cant figure out how to take the screw out.

http://img504.imageshack.us/img504/2747/s303b2600.png
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Old 08-18-2009, 06:14 PM
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Re: Piston caliper wont retract

I found a better pic, the clevis pin which connects the brake wire to the caliper is stuck

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Old 08-19-2009, 08:14 AM
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Re: Piston caliper wont retract

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I cant seem to get the e-brake line off the caliper, there is a screw with a snap pin holding it to the caliper. I took the snap pin out, but cant figure out how to take the screw out.

http://img504.imageshack.us/img504/2747/s303b2600.png
That pin is a total PITA to get out, first you need to make sure there is no dirt on it (I got the blow torch out to cook all the crap off). A chisel and a hammer may be needed to get under the head of the big pin, then a pair of pliers to pull it out. Buy a new pin from honda to replace it as chances are it will be pretty mashed up by the thime you get it out.

That assembly is one of only two things on the Prelude that I have come across thatI can say were badly designed by Honda.
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Old 08-19-2009, 08:36 AM
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Re: Piston caliper wont retract

thats the same as the 3g caliper, and they should come out really easy after you remove the cotter pin from the other side of it. mine practically fell out after i took out the cotter pins.
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Old 08-19-2009, 03:12 PM
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Re: Piston caliper wont retract

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Originally Posted by merlin View Post
That pin is a total PITA to get out, first you need to make sure there is no dirt on it (I got the blow torch out to cook all the crap off). A chisel and a hammer may be needed to get under the head of the big pin, then a pair of pliers to pull it out. Buy a new pin from honda to replace it as chances are it will be pretty mashed up by the thime you get it out.

That assembly is one of only two things on the Prelude that I have come across thatI can say were badly designed by Honda.
Thanks for the advice, the chisel idea worked pretty well after I sprayed it with WD-40. Unfortunately in the process the dust shield managed to slice through the housing of the e-brake wire, I decided to leave it as is

The caliper was indeed seized, the one on the other side retracted with very little effort. Which was probably the reason the rotor was so messed up.

Overall, I probably saved a lot of money doing the job myself, but old car = rusted bolts and pins. And the head of the bolt which holds the caliper bracket was missing on the other side, so I could only change 1 rotor. But finally the job is done
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Old 08-19-2009, 03:23 PM
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Re: Piston caliper wont retract

Just one final bit of advice, those calipers are hard to come by and local stores will need to special order it. NAPA said would take 2-3 days plus Id have to pay the shipping charge. I went to advanced auto parts and they offered overnight delivery for free, if you want to change the calipers then order them in advance.
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