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Old 02-07-2007, 05:28 AM
Registered User
Join Date: Oct 2006
Posts: 101
Question 67 250s solution for stuck rear brake calipers..and

Hi guys, I am asking this for a mate who has an old 67' 250s 6cyl and trying to get her back on the road..we have noticed the rear calipers are stuck to the disc..and not returning, the front seem ok...what is the procedure to get these to work again?? the foot pedal seems hard not soft?

Also I found previously a link to fix the automatic gear indicator on the column, fishing wire or something? tried searching but no luck again if you can point me to the right direction?

many thanks
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Old 02-07-2007, 06:40 AM
Ara T.'s Avatar
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Join Date: Sep 2004
Location: Santa Rosa, CA
Posts: 2,075
You can try a C-clamp on the caliper pistons to see if you can get them to move. Your bud will most likely end up having to replace them. Stuck calipers contribute to a hard brake pedal.
1985 CA 300D Turbo , 213K mi
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Old 02-07-2007, 01:37 PM
aircap's Avatar
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Join Date: Jan 2007
Location: I live in Wichita, Kansas USA -- Air Capital of the World.
Posts: 133
You may already know this, but when you get them unstuck, it's best to replace the brake hoses to those wheels...they can collapse inside, trapping fluid pressure at the wheels -- and thereby keeping the brakes at least partially activated all the time.

Good luck!
Wichita, Kansas USA
Air Capital of the World

1968 220 (my first MB!)
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Old 02-07-2007, 07:03 PM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 32,701
i would start by taking a medium flat screwdriver and driving it between the pad and the rotor. if this doesn't free the piston then replacement is probably in order. don't hesitate to bear down on her. these parts are very very tough.

once you pry them apart you should be able to pump them back down, but the might stick again. dont worry about the rust. once you get the calipers free just drive it for a while. if they become too clunky you may have to have them turned or replace the rotors. the calipers last a very long time.

good luck.

oh and the suggestion to replace the lines may or may not apply. sometimes the lines deteriorate and trap the calipers extended and they won't retract. other wise replacing them is fine but imho not really necessary if they aren't causing trouble. they last a very long time.

good luck

tom w
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. It still needs upholstery redone...I also have a 427 Cobra replica with an aluminum chassis.
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Old 02-07-2007, 09:38 PM
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Join Date: Jan 2007
Location: Santa Barbara, CA
Posts: 179
Stuck piston in ATE calipers

A possible cause of this condition is that of the spring being pinned in between the pads on one side and causing the piston to get somewhat cocked in the bore under the hydraulic pressure of braking.

The spring is designed to help keep the pads from wearing down to metal-metal contact on the rotor by the ~1cm wide spring getting pinned in between the metal backing plate of the pads. When the rotors get worn too thin, the spring will bind on one side earlier (before the pad material is worn down).

You can easily check this by taking off the wheel(s) and seeing if the spring is pinned in between the pads. If so, it would indicate that the rotors are probably thinner than the min spec thickness.
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