I have unseized the front nearside brake cylinders and both of the rears, but one is being really stubborn.
The rear ones are no problem, as they are a split cylinder, so once one piston is out you can drift the other out with a suitable sized bolt from the inside.
The method I have been using is to remove the brake shoes and pump the brake up. Eventually one of the pistons will pop out. Once that has been cleaned up and the new seal fitted, I pop it back in and hold it in place with a G-Clamp. Pump the brake again and the other one pops out. I have tried warming the cylinder with the blow torch and sprayed loads of WD40. I read somewhere that when all else fails - soak it in Coca-Cola. Anyone tried this?
The Coke didn't work, even after a four day soak, so it's soaking in Sarsons Pickling Vinegar. If that doesn't work I guess I'll have to buy one!!
The rear ones are no problem, as they are a split cylinder, so once one piston is out you can drift the other out with a suitable sized bolt from the inside.
The method I have been using is to remove the brake shoes and pump the brake up. Eventually one of the pistons will pop out. Once that has been cleaned up and the new seal fitted, I pop it back in and hold it in place with a G-Clamp. Pump the brake again and the other one pops out. I have tried warming the cylinder with the blow torch and sprayed loads of WD40. I read somewhere that when all else fails - soak it in Coca-Cola. Anyone tried this?
The Coke didn't work, even after a four day soak, so it's soaking in Sarsons Pickling Vinegar. If that doesn't work I guess I'll have to buy one!!
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