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03 astro van intermittent low pedal
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meev182
Novice
Jun 14, 2012, 1:12 PM
Post #1 of 13
(4129 views)
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03 astro van intermittent low pedal
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2003 chevy astro van
4.3l v6 2wd
4 wheel disc brakes w/ hydroboost
rr wheel seal was leaking so i changed rear wheel seals, serviced the rear end, and replaced all the pads and rotors.
i have an intermittent low pedal before and after service. low pedal only happens when vehicle is not running. goes to the floor for one or two pumps, then its fine. no issues with braking while driving. no brake light on in the instrument cluster.
it always acts up if i pump the brake pedal hard with vehicle running then i turn it off. hte first pump or two always go to the floor. if i do that, turn it off, dont touch the brake pedal, then start it, pedal is fine.
any ideas? ebcm? master cylinder? i dont think its the hydroboost...this is not normal for a hydroboost set up, correct?
thanks in advance for your help :o)
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meev182
Novice
Jun 14, 2012, 1:21 PM
Post #3 of 13
(4116 views)
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Re: 03 astro van intermittent low pedal
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problem existed before and after. all slides and pins were cleaned and all calipers retracted fine. i pinched off all the hoses and the problem still exists. i also bled the brakes to make sure there wasnt air in the system.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 14, 2012, 1:24 PM
Post #4 of 13
(4108 views)
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Re: 03 astro van intermittent low pedal
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If you pinched off all 4 wheels and still can't get a pedal, replace the master.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 14, 2012, 5:37 PM
Post #6 of 13
(4041 views)
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Re: 03 astro van intermittent low pedal
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All times - NO,
T
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Discretesignals
Ultimate Carjunky
/ Moderator
Jun 14, 2012, 6:47 PM
Post #9 of 13
(4020 views)
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Re: 03 astro van intermittent low pedal
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I can't remember if hydroboost does the same thing. It does have an accumulator.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 14, 2012, 6:58 PM
Post #10 of 13
(4014 views)
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Re: 03 astro van intermittent low pedal
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Hydroboost actually acts the way his is, just the opposite of vacuum. Vacuum boost drops the pedal when activated, hydroboost lifts the pedal when activated so he may not have a problem at all.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Sidom
Veteran
/ Moderator
Jun 15, 2012, 12:31 AM
Post #11 of 13
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Re: 03 astro van intermittent low pedal
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I think you're right D....On a hydro-boost system when you press on the pedal & it will go all the way to the floor and then the pedal will "bounce" while your holding it down.
If the pedal is going to the floor with very little pressure & doesn't bounce it may be a bypassing master cylinder.
If the op retracted the pistons without opening the bleeders it's possible he trashed his master.....
If the van is new to him, then he probably isn't use to the system.....If he's had the van for a while a now it "seems different" I would be tempted to put a master on it....
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meev182
Novice
Jun 16, 2012, 8:18 AM
Post #12 of 13
(3938 views)
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Re: 03 astro van intermittent low pedal
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If the pedal is going to the floor with very little pressure & doesn't bounce it may be a bypassing master cylinder.
If the op retracted the pistons without opening the bleeders it's possible he trashed his master.....
If the van is new to him, then he probably isn't use to the system.....If he's had the van for a while a now it "seems different" I would be tempted to put a master on it....
i didnt open the bleeders but i've done hundreds of brake jobs without opening the bleeders...never once had a problem doing it that way. the van is not mine, but the pedal was the same before and after (except the fact it stops better and the pedal is a little higher because of the new brake pads). as of now im going to leave it how it is...truck stops fine. very weird though!
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