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Old 08-13-2012, 12:33 AM   #1 (permalink)
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Weak Brake Pedal

I Have 2003 Impala 3.8 that I just installed New Rotors and new pads. I took the caliper off to paint it anyways long story short... when I bled the brakes (with the car off) the brake pedal was very firm but as soon as I started the car my foot went almost completely to the floor. So thinking that I should've had the car on I re-bled the brakes but still the brake pedal felt spongy and my foot goes floor for a complete stop. I would really appreciate any help I can get on this issue
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Old 08-13-2012, 09:18 AM   #2 (permalink)
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Are you bleeding the brakes in a particular order or random? Farthest from the master cylinder should be first and alternating thereafter from rear to front.

What you are describing is air in the lines somewhere. You shouldn't have to bleed your master cylinder since you haven't replaced it but it never hurts to do it.

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Old 08-13-2012, 10:49 AM   #3 (permalink)
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Originally Posted by auntjemima View Post
Are you bleeding the brakes in a particular order or random? Farthest from the master cylinder should be first and alternating thereafter from rear to front.

What you are describing is air in the lines somewhere. You shouldn't have to bleed your master cylinder since you haven't replaced it but it never hurts to do it.
I bled the brakes RR,LR,RF,LF. Would it matter if the car was on or not? How do you bleed a master cylinder?

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Old 08-13-2012, 11:17 AM   #4 (permalink)
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Car should be off, you'll pump out too much with the boost. Bleeding the MC usually requires taking it out.

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Old 08-13-2012, 01:49 PM   #5 (permalink)
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Correct, you would need to take out the MC ad "bench bleed" it. This is done by making 2 lines that leave the ports and end in the reservoir. Then you could use a rod or a punch to actuate the MC until there were no more air bubbles and then reinstall.

If you are bleeding the wheels properly and still have air then this is generally the next item in the path. Having a pedal that goes to the floor is generally a MC anyways but since it's kinda spongy to you as well I would lean towards air.

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