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Rear brake retaining spring and pressure bleeding Posted by sam96CS [Email]  (#852) [Profile/Gallery]
(more from sam96CS) on Fri, 14 Nov 2014 12:39:41
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I'm replacing pads, rotors and calipers at the rear. I'm a brake newbie so there's been a learning curve. Here are things I've learned that might be useful.
The original retaining spring (anti-rattle spring) is of higher quality and better fitting than the spring that shipped with my rebuilt AutoZone calipers. My originals weren't rusted, so I'm using them again instead of the AZ springs.
I stumbled across a relatively easy and tool-free method of installing the spring. Engage the bottom hole and the bottom face of the caliper mounting bracket (caliper carrier). Then engage the top hole. Then force the top loop of the spring onto the top face of the caliper mounting bracket. I did that by hand, and my fingers aren't all that strong.
I have the Motive pressure bleeder, and I bled a rear caliper on a '96 CS with ABS brakes without putting brake fluid in the Motive tank, without turning the ignition to the ON position and without brake pedal pumping.
I started by sucking as much old fluid out of the reservoir as possible with a clean turkey baster. The amount removed by this method was about 8 ounces, and it brought the fluid level down to the MIN mark on the reservoir. I filled the reservoir with fresh fluid. I screwed together the two tubing sections of the Motive bleeder, then attached the Motive's cap to the reservoir and pumped the Motive tank to 12 PSI. At the caliper I had already loosened the nipple then ran it closed but not very tight. I attached a short piece of clear vinyl tube (it came with the Motive bleeder) to the nipple and ran it to a quart size clear Mason jar. I opened the bleeder with an open end wrench, and old bubbly yellowish brake fluid came out. After that I just watched everything, especially the brake fluid level in the reservoir. The pressure in the Motive tank dropped a bit, so I pumped it back to 12 psi, and that improved the flow. After the jar was filled to about the 6 ounce level the fluid in the tube was clear and free of bubbles. So I tightened the bleeder to stop the flow, removed the drain tube, disconnected the Motive setup from the reservoir and filled the reservoir again with fresh fluid. The level remained above the MIN mark throughout. At this point I could have moved on to the next wheel if all I was doing was bleeding the brakes.
None of the above has been road tested. I'll add an update to this thread if things don't turn out as well as expected.
, Fri, 14 Nov 2014 12:39:41 <-- Viewing This Message
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