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Old 01-31-2010, 08:57 PM
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Weak Break Pedal

Hi guys, I could need your help.
Lately I was driving my girls 2002 Civic and I notice the break pedal was going almost to the floor board.
Now I checked that out today. Disc's and pads are in good shape. The break fluid reservoir was full. So I thought I just bleed the breaks to take care of the issue. I refilled te reservoir about 4 times while doing the bleeding. Result: No change. Pedal still close to the floor. I didnt use to be like that. There are no leaks and the break lines look like new as well. What you guys think the problem is? Master cylinder? Booster? ABS module?
Any help will be greatly appreciated.

Tomi

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Old 01-31-2010, 09:48 PM
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Does the pedal sink slow with pressure on it, or push low before braking is observed? What happens if you "stab" it?
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Old 02-01-2010, 07:22 AM
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It doesn't go in further over time. It just goes very deep to the floor board.
Not really a difference if I stab it or push slow.
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Old 02-01-2010, 07:53 AM
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E brake

On some cars the emergency brake self adjusters will readjust when you back up and apply the brake. How does the e brake work .? how far to pull the handle to lock up. ? how muck pedal movement before braking starts.
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Old 02-01-2010, 08:03 AM
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I have to look at the e break. Not sure how it works. I believe its a simple cable operated on. The pedal goes about 2" until it starts breaking.
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Old 02-01-2010, 09:36 AM
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Do you know if the master cylinder is a stepped bore, or quick take-up type?
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Old 02-01-2010, 10:00 AM
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I have no idea cobalt.
I will look at the manual and let you know.

Tomi
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Old 02-01-2010, 10:05 AM
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Quote:
Originally Posted by Furytom
I have no idea cobalt.
I will look at the manual and let you know.

Tomi
Reason I ask, is that could be a point of wear, and could cause the pedal to be deep.

All in all, if you have no leaks at the slaves or lines- and you are losing no fluid AND the brakes are working as they should other than the deep pedal, the master would be suspect.
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Old 02-01-2010, 10:49 AM
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That was my best guess as well. I know the system does not leak at all and there is no air in it. since this is a pretty simple hydraulic circuit there is not too much left then the master cylinder. But I thought I better ask people who actually know like you guys.

Tomi
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Old 02-01-2010, 04:41 PM
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If they are rear drums, it may be as simple as an adjustment.
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Old 02-01-2010, 06:00 PM
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That might be damn right. I will check that out in a lil bit! Thanks T-Bucket.
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Old 02-07-2010, 07:29 PM
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Don't forget to watch for excess run-out on the front rotors - either from warpage or loose wheel bearings. Either one can push the pads back too far into the caliper - when you apply the brakes the pads have to be pushed further before they make contact and you feel resistance.
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Old 02-14-2010, 08:21 PM
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Hi guys.
Thanks for all your help and good ideas.
I finally got to work some more on the breaks.
The rear drums are like new (everything measures withing factory specs and they are self adjusting so that is not it.
The Front discs are not warped at all. If they would the the car would vibrate like crazy (I had that before!). So I did some more testing. If the car is not running so no boost the pedal is hard half way down but then it goes down slowly but surely. If the car is running the pedal goes almost to the floor. If you let loose and push hard again it is firm half way thru again as it should be. That been that everything points to air in the system. But I did bleed already and the manual doesnt say anything about energizing the ABS module.
I'm not sure what to do. Any more suggestions?

Tomi
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Old 02-14-2010, 09:14 PM
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If the pedal slowly goes to teh floor while holding steady pressure that usually points to the master cylinder.
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Old 02-15-2010, 05:57 AM
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Sounds like you need a rear brake adjustment to get a better pedal, (some self adjusters work off backing up and hitting the brakes, most Asian imports work when using the E-brake, but neither work if you don't use them the way they were intended). If the pedal slowly drifts down from halfway depressed, it sounds like the master is bypassing. I would do a rear brake adjustment first, then see where you're at from there. If the master still goes down slowly while you're holding pressure on it, replace it.
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