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Front Calipers Seizing Up!

Unread postby Roattorevolution on Mon Jan 09, 2017 8:32 pm

I have a 1975 270 and have had nothing but problems with my front end. I have replaced the calipers now twice, and they are still seizing up. Has anyone else had this issue, and if so, what is the solution?

I have never heard of brand new calipers, with less then 2000 miles on them seizing. They were bled properly and were adjusted properly also.
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Re: Front Calipers Seizing Up!

Unread postby badbillybiker on Tue Jan 10, 2017 5:25 am

Two sets of brakes? Highly unusual... Have you run a dial indicator across the surface of the rotors or checked for runout?
There really is no adjustment on calipers/disc brakes that I am aware of outside of correct bleeding. The pads are free floating and as they wear more brake fluid takes up the slack and the pedal goes down slightly. That is the only adjustment I am aware of... As the "puck" just free floats, my thinking is the "puck" is being pushed back at a angle and as the rotor turns, any warpage would/could cock the "puck" as it is "forced" back into the bore when brakes are applied...again due to the warpage.preventing the pads from retracting/releasing properly..JMO/FWIW
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Re: Front Calipers Seizing Up!

Unread postby KB2CRK on Tue Jan 10, 2017 6:05 am

Did you change your brake hoses to the calipers? An deteriorated hose can act like a check valve and not allow the calipers to release. quick check for this would be to crack a bleeder when the caliper appears to be stuck and if it frees up, It is most likely the hose.
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Re: Front Calipers Seizing Up!

Unread postby diskman on Tue Jan 31, 2017 11:59 am

On my 1975 270 the fronts were not releasing also.

It ended up being the brake petal pivot points needed to be cleaned and greased! Seems the brake pedal needs to return ALL the way to the top to allow the pressure to return back to the master cylinder.

After degreasing the whole assembly underneath, applying PB Blaster and re-greasing via the zerk fittings, my 270 drives great now. No more hanging brakes.

If the fronts are binding, grab a 3/8 wrnech and open a bleeder on the caliper. See if it's under pressure. Repeat with the other side. See if that makes it drivable again until you hit the pedal. That's how I diagnosed mine.

Also replacing the rubber lines SHOULD be done every few years.
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