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
BI

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.

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!

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

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.