rear caliper - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Brakes, Suspension, Wheels and Tires > Brakes

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Old 05-12-2016, 07:58 PM
ccfbailey ccfbailey is offline
Junior Member
2003 Chevy TrailBlazer LS
Summit White 4.2L I6 4X4
Join Date: Nov 2012
Location: london ontario
Posts: 7
rear caliper

Hi all. Finally got around to changing my right rear caliber that was seized. everything was going great until I bolted the hose back on. Fluid was leaking before I even hit the brake pedal WTH!! Anyway turned out to be a defective caliper that wasn't machined at the bolt hole for the washer to fit. OK... I put the old one back on so I could go exchange it. Didn't bother bleeding it and drove a mile to the parts store with very little braking power.... much worse than before I started the job. Got home and installed the new caliper. All went well except I can't get the thing to bleed and the piston won't come out. I spent half an hour trying to bleed the thing using the hose and bottle method. Could there be that much air in the system that very little fluid comes out and the piston won't move? I bled brakes and installed many callipers this way without a problem. Any ideas what direction to go would be much appreciated!
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Old 03-04-2018, 05:50 AM
BlackBetty06's Avatar
BlackBetty06 BlackBetty06 is offline
Junior Member
2006 Chevy TrailBlazer LTZ
Black 4.2L I6 2WD
Join Date: Jun 2015
Location: Alexandria, LA
Posts: 1
Rear brake caliper

Today i changed my front rotors and brake pads. Everything was going great until the test drive. The brakes where very spongy. I checked the brake fluid and i was very low. so i got a 32 oz and i went home twenty minute drive home my brake like is on. i park and within 20 minutes the back drivers side rotor or hose had dumped all of the brake fluid on the ground and all over the back of the tire no other tire is doing this. Does anyone have advise on what i can do before sending it to a mechanic.

Thank you,
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Old 03-09-2018, 02:27 AM
plscolla plscolla is offline
Junior Member
2004 Chevy TrailBlazer LT
Silverstone Metallic 4.2L I6 4X4
Join Date: Dec 2009
Location: Maryland
Posts: 20
First to address ccfbailey's concern:

Sounds like the second new caliper is not right. The piston should move freely in and out with relatively little effort. Regarding the amount of air that can be trapped in a brake line, yes, sometimes there can be what seems to be an unreal amount of air.

Now to address BlackBetty06's concern:

You have a brake line leak. Likey one or a combination of the following
a hose developed a leak
a steel brake line developed a leak
the caliper itself is leaking either from the piston seal or where the brake hose connects to the caliper

Good luck to both of you
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