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  #1  
Old 07-11-2019, 10:09 PM
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How to test brake caliper NOT installed?

I have 4 used brake calipers that were removed from a 300CD but may not have been seized , as the problem turned out to be something else.


Wondering if anyone has an idea how i can test these calipers short of installing them and seeing if they work?


Thanks!
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Old 07-11-2019, 10:41 PM
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Nothing short of rigging up a test bench which would cost a couple of hundred dollars at a minimum.

Hydraulic pump, suitable hoses, piston retainers (could use a block of wood) and a gauge. This would only test total pressure. Would work only on a single caliper design. Wouldn't tell whether the pressure is applied evenly to multiple calipers.

Initial test on a new rebuild uses vacuum but this method can't be trusted on a used caliper due to possible wear on the piston.
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Old 07-11-2019, 11:05 PM
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If you place a board in the caliper to prevent the pistons from blowing out, you can use compressed air to observe the pistons for proper movement.
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Old 07-12-2019, 12:21 AM
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Compressed air sounds good to me!

Thanx, Tango Fox, i wil! give that a try.
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Old 07-12-2019, 06:10 AM
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Quote:
Originally Posted by sun tortise View Post
I have 4 used brake calipers that were removed from a 300CD but may not have been seized , as the problem turned out to be something else.


Wondering if anyone has an idea how i can test these calipers short of installing them and seeing if they work?


Thanks!

Define "test". Do you want to test mechanical function and / or leak?

How long have these been sitting after removal from the car? Was the fluid drained and ports capped?

What was the initial problem that turned out to be something else?
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