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Old 04-10-2012, 05:31 PM   #181
danedg
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Crustacean




So this appears dead. Am I wrong?
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Old 04-10-2012, 06:29 PM   #182
ADV8
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Pull the dust seal off and have a look ?

Brembo 08 piston kits are readily available.
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Old 04-10-2012, 07:06 PM   #183
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It ain't gonna kill me to get a fresh new one,whereas it probably WOULD kill me to try and use this corroded lump again.
Two Craftsman screw drivers didn't budge a thing.
The instructions suggest blowing compressed air into the bleeder hole to gently blow the pistons out to replace the seals...

Polar bears ain't gonna get them seals outta those holes!!!
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Old 04-10-2012, 07:17 PM   #184
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I had one like that on a old BMW ATE and filled it with Liquid Wrench, sealed it and left it in a bucket of kerosene for a few days.
It worked, make sure you point it in a trash can when you apply air pressure and not outside towards the car.
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Old 04-10-2012, 07:19 PM   #185
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Quote:
Originally Posted by danedg View Post
It ain't gonna kill me to get a fresh new one,whereas it probably WOULD kill me to try and use this corroded lump again.
Two Craftsman screw drivers didn't budge a thing.
The instructions suggest blowing compressed air into the bleeder hole to gently blow the pistons out to replace the seals...

Polar bears ain't gonna get them seals outta those holes!!!
Heat to smoking with a propane torch. Heat more. Spray piston edge with penetrating oil of choice. Clamp caliper half in a vice with some kind of soft jaws. Twist piston out with vicegrips. I haven't lost one yet.

I have had to ditch calipers for snapped-off bleeder nipples, though.
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Old 04-10-2012, 07:28 PM   #186
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Originally Posted by F_Sahms View Post
Heat to smoking with a propane torch. Heat more. Spray piston edge with penetrating oil of choice. Clamp caliper half in a vice with some kind of soft jaws. Twist piston out with vicegrips. I haven't lost one yet.

I have had to ditch calipers for snapped-off bleeder nipples, though.

MAPP gas is all I use for that sort of thing!

The bleeder didn't actually look that bad. It was embedded in a greasy goo, probably not a bad thing. But I didn't try a wrench on it yet....
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Old 04-10-2012, 10:15 PM   #187
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Quote:
Originally Posted by danedg View Post
But I didn't try a wrench on it yet....
Lots of heat on the bleeders first.
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Old 04-11-2012, 03:26 AM   #188
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Soak in pb blaster, or whatever. ATF and acetone is great.

Then use a grease gun to put grease into the caliper. I just put a grease nipple on the inlet side. However you do it, a hand grease gun can put 3000 psi out without problem, and it is hydrostatic, so you don't blow a piston through the wall.
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Old 04-11-2012, 04:52 AM   #189
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Quote:
Originally Posted by wmax351 View Post
Soak in pb blaster, or whatever. ATF and acetone is great.

Then use a grease gun to put grease into the caliper. I just put a grease nipple on the inlet side. However you do it, a hand grease gun can put 3000 psi out without problem, and it is hydrostatic, so you don't blow a piston through the wall.

Like the way you think, very practical solution,
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Old 04-11-2012, 06:13 AM   #190
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Thank You Gentlemen,

This is all great stuff! While the particular nuance of each bike/brand keeps us entertained, I especially enjoy the basic methods of work that apply to them all!

I'm getting the feeling here that once the pots have been extracted that the caliper housing can be reused? I was concerned about the corroded receivers losing their ability to contain hydraulic pressure...
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Old 04-11-2012, 06:44 AM   #191
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The one advantage of my 74 Eldorado project with the four leading shoe drum brake.No hydraulics to worry about. On my 77 Lemans I replaced all the calipers. At the time it wasn't that much more over a rebuild with new seals and piston.
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Old 04-11-2012, 09:12 AM   #192
danedg
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Mission Accomplished

I love the smell of NutsOff in the morning! It smells like...Victory!
They looked a lot worser than they wuzzer.
New aluminum pistons, pads, bleeder on the way...

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Old 04-11-2012, 02:02 PM   #193
wmax351
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Quote:
Originally Posted by hunter_greyghost View Post
Like the way you think, very practical solution,
Cheers
Baza
Worked great on my '73 Triumph TR7V, even after 15 years sitting in santa cruz.
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Old 04-11-2012, 03:55 PM   #194
danedg
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Love It!

Quote:
Originally Posted by wmax351 View Post
Soak in pb blaster, or whatever. ATF and acetone is great.

Then use a grease gun to put grease into the caliper. I just put a grease nipple on the inlet side. However you do it, a hand grease gun can put 3000 psi out without problem, and it is hydrostatic, so you don't blow a piston through the wall.

Friggin' brilliant!
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Old 04-12-2012, 07:37 AM   #195
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We used the grease method on a frozen piston on a /5 BMW had.
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