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Old 04-14-2012, 12:43 PM   #1
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Default Brake issues

Hey guys,

It'* been a while since I've posted but as always problems always will draw us back. Last night I replaced the front pads and rotors on the GXP as the passenger side was making a horrible noise. I used Akebono ceramics and AC Delco rotors to complete the job. When I lowered the car and pumped the brakes the pedal wouldn't pump up.

Figuring it was a bad master cylinder I went to the part store and picked one up. I bench bled it, installed, and bled the system. The brakes now feel better but still with heavy pressure they will sink to the floor.

I'm either thinking the replacement is defective or maybe the system needs to be rebled. Looking for thoughts and opinions.

Thanks,

Matt
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Old 04-14-2012, 12:51 PM   #2
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Check the hoses to your brake calipers. I'm wondering if you sprung a leak while manhandling the calipers. Which is typical.
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Old 04-14-2012, 03:27 PM   #3
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Mike, no leaks that I can find. I did check the brake feel in my mothers 2000 Bonneville, feels much the same. I wonder if the brakes have always done this and I havent noticed it until now? Is this brake feel inherent to GM ABS?
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Old 04-14-2012, 03:59 PM   #4
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I have had something similar happen before when I replaced the front pads. Don't remember if it was my Blazer or my Bonneville, but the firmness got better the more I pumped it.

I think rjblazer told me awhile ago that when you compress the pistons on the calipers to replace the pads and put them back over the rotors, it takes awhile for the fluid to "replenish" itself taking up the extra slack at the rotors. Though they are new and thicker, you did push alot of fluid back into the reservoir.

Dumb question, but did you take the cap off the reservoir when you clamped the calipers?
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