Brake Caliper Piston - Nissan Forum
 
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#1 Old Dec 10th, 2012, 10:35 AM
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Brake Caliper Piston

I was replacing the front brakes on my 95 Nissan Hardbody and I could not get the pistons to push back enough to install the new pads. I tried using a C clamp and I was putting more than enough force (probably too much), but they would not move. Any suggestions? Should I have the bleeder open when I push the pistons back?

Thanks,

Steve
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#2 Old Dec 10th, 2012, 11:47 AM
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did you take the cap off of the reservoir? might have someone keep a eye on it also, to make sure it doesnt overflow....
#3 Old Dec 10th, 2012, 03:00 PM
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It could be the piston "cocked" or the brake hose is collapsed internally or that the caliper is seized. Crack open the bleeder and see if the piston retracts. If it does, you may need a new brake hose. If it doesn't, try loosening up on the clamp and have someone step on the brake pedal and watch to see if the piston pushes out (make sure your brake drums are installed in the rear and the opposite caliper is not left hanging without a clamp on it before you do this). If the piston extracts, recenter the C-clamp and try again. If not, your caliper is likely siezed and should be replaced.
#4 Old Dec 10th, 2012, 05:06 PM
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Quote:
Originally Posted by smj999smj View Post
It could be the piston "cocked" or the brake hose is collapsed internally or that the caliper is seized. Crack open the bleeder and see if the piston retracts. If it does, you may need a new brake hose. If it doesn't, try loosening up on the clamp and have someone step on the brake pedal and watch to see if the piston pushes out (make sure your brake drums are installed in the rear and the opposite caliper is not left hanging without a clamp on it before you do this). If the piston extracts, recenter the C-clamp and try again. If not, your caliper is likely seized and should be replaced.
Yup, good post!
Old brake fluid collects moisture, and that tends to settle around the caliper pistons leaving rust that the seal and piston can't easily be pushed backward past. Hoses do sometimes break down and fail internally before they look bad on the outside. Brake fluid changes every couple of years can help prevent these types of failures. Fluid is cheap!



-R

1994 D21 2.4, 2wd, 5spd XE
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