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  #1  
Old 01-01-2007, 07:41 PM
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Default Brake woes

OK..the story is a nagging little problem. When I step down on the brake pedal it feels fairly firm, but if I apply more pressure the pedal slowly heads towards the floor. Not all the way, but still that doesn't seem right.

The beginning of this story starts a few months ago. I installed PowerSlot rotors, stainless brake lines and put Hawk pads on front and stock on the rear. While I was into it I flushed the lines and refilled with ATE blue. I used a power bleeder at 14-15 PSI. The brakes stopped fine, but something just didn't feel right. I did a track day with no problems. A month ago I fushed the system again to see if things felt better, but I'm left with the problem I mention at the beginning of this post. All throughout this time I kept checking for any leaks. None. Can air get in without fluid leaking out? The car is sitting at 67000 miles. How long does a master cylinder last? One of the things that makes this harder to figure out is that after doing the brake work I really paid close attention to how they were working, but not before. I might of had this problem before I did the work. I don't know.

Any ideas would be appreciated.
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Old 01-01-2007, 08:36 PM
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If you have not had to add fluid, first guess from here is MC is bypassing.
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Old 01-01-2007, 08:52 PM
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and how much duct tape will that need?

So would we be talking about a seal or something?
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Old 01-01-2007, 09:20 PM
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Could just be the pads I know when I upgraded that I lost hte feeling of the inital "bite" of the pads and didn't "feel" anything pedal wise until I had the ABS kicking the pedal back out at me. I had an extensive conversation about pads with a regular in Grassroots motorsports and its actually something he has become quite aware of test a variety of pads for the magazine is when changeing just pads you can and will feel a significant difference in the pedal just going with different pads in each brand or going brand to brand.

I managed to relearn to modulate the brakes a little better and get a little better since about the feel of them over several months. Did you notice any air bubbles when you bled last time? If you have the car sitting still and you pump the pedal does it build up firm?
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Old 01-01-2007, 09:30 PM
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I had almost the same thing happen when I finally had my brakes done at the dealer on my previous Mini...just didn't feel the same.
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Old 01-01-2007, 11:13 PM
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Quote:
Originally Posted by LEPRACHAUN View Post
and how much duct tape will that need?

So would we be talking about a seal or something?
However much it takes. Never stint when using duct tape to repair your brakes.
Just be sure to get the sooper dooper industrial kind. I have a good source if you are in need.

I went to the arm chair expert because his finger still looks like this:

Click the image to open in full size.

He said you can put some stock pads back on to see if it makes a difference.
He also recommends "something" rather than a seal in the case of the MC.
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Old 01-02-2007, 01:55 AM
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Quote:
Originally Posted by Motor On View Post
Did you notice any air bubbles when you bled last time? If you have the car sitting still and you pump the pedal does it build up firm?
A few bubbles, not a lot. I do need to bleed again to check though. As far as the second question I went outside and checked. Total firm pedal, no sinking at all. But then I started the car and tried it, firm pedal, but then it started to sink.(Alright I've had a cold/cough/sinus thing for the past 4 weeks and found out today it's now acute bronchitis and I got some very good cough medicine.)But I'm sure of the difference. I may just have to give in and go to the dealer. Looks like I'm headed in to the master cylinder/brake booster area. Does this seem like right dirrection? Not something I'd want to fool with especially throwing ABS in.

Appreciate everyone's input. Tomorrow in the daylight I'll take a look around at the lines heading to the booster. Maybe something will stand out.
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Old 01-02-2007, 03:11 AM
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Man, sorry to hear this continues to plague your 'Coop.

My brake job turned out to be flawless with the similar setup. I did get different pads then you (Axxis), but they are a bit more aggressive like your Hawks and require a tad more heat to get grip too.

Based on your comments at our last club outing, I think you are wise to check the MC and all of the lines again too. Certainly wouldn't hurt (although you're not adding fluid right?).

Do you want to do a caffeine run later this week? We could exchange cars for a minute to drive and see how they feel to each other. That would at least alleviate/prove your fears. My schedule is pretty flexible, we could meet in Bellevue or Brentwood and scoot around. Bellevue might be easier - fewer constables on the prowl there...
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Old 01-02-2007, 11:40 AM
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Teach your oldest kiddo to help you bleed the lines the old fashioned way.
They like that stuff. Start 'em young.
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Old 01-02-2007, 03:58 PM
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Damn, I knew there was a valid reason to have kids...
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Old 01-02-2007, 04:14 PM
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Quote:
Originally Posted by Drewmon View Post
Bellevue might be easier - fewer constables on the prowl there...
Bellevue would work. I'm open until about 2:30 every day with no problems. Other times could be worked with a bit of planning. I get the kids from school at Davidson Rd near Charlotte WalMart. I'm going out now to give an underhood look-see. Maybe something will be obviously out of place.
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Old 01-06-2007, 05:32 PM
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Not sure how I missed your reply - D'Oh!

I'll PM you with contact info. And we can hook up to see what we can see (or at least stop what we can stop).
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Old 01-10-2007, 04:50 AM
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Any luck?

I suggest trying some stock pads, and re bleeding the system. After that I would look into the MC. A new one can't be too much $$. You are running stock calipers right?
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Old 01-10-2007, 01:41 PM
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First off THE TICK RULES. One of the top super heros.

No I've quit on them temporarily. Finally a bit too cold to sit out in the gravel drive and work on them. I've tried a few emergency stops with no problems, so I'm ok there. The next warm spell we get I think I'll try the stock pads and re-bleed.
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