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Canadian Poncho Homepage -> Canadian Poncho -> 1970 + Canadian Pontiac Chassis Forum -> Seized single piston GM caliper
Post Info TOPIC: Seized single piston GM caliper
pontorquer


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Seized single piston GM caliper
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Seems like it doesn't take long for these rebuilt caliper we buy for cheap at the parts store to seize from sitting ... What is the best way to unseize the piston ?



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4SPEED427


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Some guys use a compressor and a blow gun but put something in there so the piston can't come all the way out and become a missile!

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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pontorquer


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Wouldn't this rip the rubber around it ? 



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4SPEED427


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Try putting a block of wood or something so it can just move a bit, not enough to damage something.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
pontorquer


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I had two of them seized tonight ( I got the other one from my parts car) I pressed the brake pedal, they eventually came out but wouldn't go back in the caliper housing even with my press.



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4SPEED427


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They're pretty cheap to buy, I'd just replace them to be safe.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
pontorquer


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Yes, that's what I thought and i'll make sure to press the brakes during the winter months of storage ... Thanks Carl.



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68post


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Pascal you might consider converting to silicone based brake fluid as well, it doesn't attracy moisture like the regular stuff. (Doesn't take paint off either if spilled.)

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Barry -

2 x 68 Beaumonts, 1post, 1 hardtop (projects)

2x 65 Chevelle 300 deluxe (projects)

69 SS396 300 deluxe post

 

 

 

Fredericton,NB

 
Taylor55


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Would you have to drain the complete hydraulic brake system first then flush the lines a bit then use the silicon fluid or is it compatible with the old fluid?

 

Al



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68sd396rag


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you need to drain the whole system before you put the silicon fluid in.I run silicin fluid in all my cars.



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Pontiacanada


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68sd396rag wrote:

you need to drain the whole system before you put the silicon fluid in.I run silicin fluid in all my cars.

 What do you use to flush the system, or does it have to be flushed to clean it out?



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Prince Edward Island

'64 Parisienne CS "barn find" - last on the road in '86 ... Owner Protection Plan booklet, original paint, original near-mint aqua interior, original aqua GM floor mats, original 283, factory posi, and original rust.

68sd396rag


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Just drain out the old stuff and put in th new

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pontorquer


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Gotta love old cars, alot cheaper on parts than new ones ! (GM refurbished caliper by Fenco) 19$ on sale at Crappy Tire ! I installed it late this afternoon ... My car is just a driver, not a show car so I put the usual DOT 3 brake fluid. Also, No need to rebuild my old one, I exchanged it as a core. I was leaking more than the brake fluid, lol, 30 degree weather here, she's a hot one ...



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