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Front brakes on an 86 by stevep914
Started on: 03-04-2015 02:38 PM
Replies: 9 (192 views)
Last post by: stevep914 on 03-05-2015 11:38 PM
stevep914
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Report this Post03-04-2015 02:38 PM Click Here to See the Profile for stevep914Send a Private Message to stevep914Edit/Delete MessageReply w/QuoteDirect Link to This Post
I have a dragging front brake on the driver's side. I have pulled it off, and worked the piston in and out with a c clamp. It appears to be functioning. I noticed that the slider sleeves are not moving within the caliper body ( these are the sleeves the mounting bolts go through) Should they be moving freely, or are they fixed within the caliper body? Thanks in advance . S.
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tebailey
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Report this Post03-04-2015 02:53 PM Click Here to See the Profile for tebaileyClick Here to Email tebaileySend a Private Message to tebaileyEdit/Delete MessageReply w/QuoteDirect Link to This Post
You may want to pull the caliper and clean and lube the pins and sleeves. The caliper has to slide on the pins or it will drag on the rotor the first time you hit the brakes.

[This message has been edited by tebailey (edited 03-04-2015).]

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stevep914
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Report this Post03-04-2015 03:12 PM Click Here to See the Profile for stevep914Send a Private Message to stevep914Edit/Delete MessageReply w/QuoteDirect Link to This Post
So the sleeves are fixed, and the lubrication would be on the pins and the INSIDE bore of the sleeves?
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tebailey
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Report this Post03-04-2015 03:20 PM Click Here to See the Profile for tebaileyClick Here to Email tebaileySend a Private Message to tebaileyEdit/Delete MessageReply w/QuoteDirect Link to This Post
The sleeves should slide against the rubber o-rings in the caliper. The caliper floats on the sleeves. The o-rings keep the caliper from sliding to far back. I lube the pins for future removal.

[This message has been edited by tebailey (edited 03-04-2015).]

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stevep914
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Report this Post03-04-2015 07:31 PM Click Here to See the Profile for stevep914Send a Private Message to stevep914Edit/Delete MessageReply w/QuoteDirect Link to This Post
Thankyou for your input! So I guess the next question would be: if my sleeves are frozen into the caliper, hiow can I drift them out without damaging snything?
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tebailey
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Report this Post03-04-2015 08:07 PM Click Here to See the Profile for tebaileyClick Here to Email tebaileySend a Private Message to tebaileyEdit/Delete MessageReply w/QuoteDirect Link to This Post
I would try letting them soak in penetrating oil, then tap them out with a deep well socket, your probably going to need to get a hardware kit for them, so don't worry about ruining them they're not too expensive. Mine had sat for 10yrs and were froze up bad. I managed to save the front calipers, but that was all. I had to replace all the pins and bushings. The bolts come with the sliders, I got mine at autozone, if you can't find them local the Fiero Store sells them. Also the boot kits that come with all the seals for them.

[This message has been edited by tebailey (edited 03-04-2015).]

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steve308
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Report this Post03-04-2015 08:21 PM Click Here to See the Profile for steve308Send a Private Message to steve308Edit/Delete MessageReply w/QuoteDirect Link to This Post
Get a rebuilt caliper- 2 new brake hoses - new friction on both sides - refresh the brake fluid. Not as expensive as you think and makes life so much easier.
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tebailey
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Report this Post03-04-2015 09:33 PM Click Here to See the Profile for tebaileyClick Here to Email tebaileySend a Private Message to tebaileyEdit/Delete MessageReply w/QuoteDirect Link to This Post
If there is any sign of fluid leaking out the pistons, that would be the way to go. I went the cheap route and rebuilt mine, the kit was only $3@ for the calipers and if I remember right the hardware kits were about $15 for both sides. Hoses are always a good idea given the age these cars are getting to be.
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theogre
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Report this Post03-05-2015 11:07 AM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
"Frozen" sliders are easy when people didn't lube them. Might have too much corrosion to remove slider w/o hydro pressing.
"Stuck" sliders could be corrosion or wrong lube. Wrong lube can swell the rubber "O-ring" bushings and cause pad problems. Most times you can fix this and use new "O-rings."
But!
Normal operation sliders can stuck trying to move by hand even enough and correct lube is used.

Should be fairly easy to remove using big pliers etc to press out the sleeve.

"O-rings" are the "Spring" for outer pads so won't drag the rotor.
Right after you lube them can slid easy but after a bit is hard to slid w/ hand pressure. Don't worry. Sliders will move at brake pressure if you lube the correctly.

Use Brake Grease. If you think wrong lube was used then need new O-ring because swelling damage is permanent.

See my Cave, Brake Service

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stevep914
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Report this Post03-05-2015 11:38 PM Click Here to See the Profile for stevep914Send a Private Message to stevep914Edit/Delete MessageReply w/QuoteDirect Link to This Post
Just a followup to all this: I do not have access to rebuilt anything for the Fiero in Mexico, and Autozone here does not stock much either- no O rings, caliper bolts, sliders, etc. So I got creative, and once I drifted out the sliders, which were in good condition, I noticed someone before me had used the wrong grease, and the o rings were really swollen. It took some serious pounding to get the sliders to move at all. I took some emery cloth, and buffed down the o rings a bit, did manage to find silicone grease ( not easy) and got that all working very smoothly. i have now found out the piston is sticky, and does not retract fully without some coaxing. So the project goes on.....
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