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Old 03-16-2018, 03:12 PM
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Used compressed air to unstick brake caliper, only one caliper moved....

Working on the calipers on the 1991 560SEL. I'm using compressed air (brake caliper kit purchased from Kent at mercedes source). I placed a small board between the calipers then hit it with compressed air into a new meyle brake hose. Only one caliper moved.

Question, if I put the caliper back on the car and step on the brake pedal will it unstick the other caliper?
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Used compressed air to unstick brake caliper, only one caliper moved....-560-brake-caliper-001.jpg   Used compressed air to unstick brake caliper, only one caliper moved....-560-brake-caliper-003.jpg  
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Old 03-16-2018, 03:48 PM
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You can try unsticking it with the brake pedal, however if they're really that seized you may be better off with a reman caliper! You're going to have to tear that one down and rebuild it and hone the cylinders anyway.
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Old 03-16-2018, 03:55 PM
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Quote:
Originally Posted by HuskyMan View Post
Working on the calipers on the 1991 560SEL. I'm using compressed air (brake caliper kit purchased from Kent at mercedes source). I placed a small board between the calipers then hit it with compressed air into a new meyle brake hose. Only one caliper moved.

Question, if I put the caliper back on the car and step on the brake pedal will it unstick the other caliper?
Using brake hydraulic pressure is a lot more powerful than compressed air. The caliper doesn't appear severely corroded or otherwise not worth rebuilding. So yes, I would mount it on the car.

Push the free piston back in and insert a new brake pad on that side only. Leave the stuck piston side empty with no brake pad, or you can use a very thin worn down brake pad if you have one. The new brake pad will prevent the free piston from travelling much, and the air gap on the other side allows the stuck piston room to move. The brake rotor will prevent it from shooting out and making a mess.
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Old 03-16-2018, 05:28 PM
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I need to reinstall the bolt that goes just underneath the calipers....

Should I use red, blue or green thread locker on this bolt?
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Used compressed air to unstick brake caliper, only one caliper moved....-brake-caliper-bolt-001.jpg   Used compressed air to unstick brake caliper, only one caliper moved....-brake-caliper-bolt-003.jpg  
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Old 03-16-2018, 05:44 PM
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Quote:
Originally Posted by Diseasel300 View Post
You can try unsticking it with the brake pedal, however if they're really that seized you may be better off with a reman caliper! You're going to have to tear that one down and rebuild it and hone the cylinders anyway.


This.
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Old 03-17-2018, 11:43 AM
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You may be able to get it loose, but as said above, be perpared to buy a new caliper, anyway. If it it that stuck, it is stuck due to rust between the piston and bore, which means rust pitting.
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