Brake Bleeding Question
#1
One Neat FD3S RX7
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Brake Bleeding Question
I've been having the hardest time with my spongy, spongy, spngy-*** brakes. It all started about a few months ago. I tried removing the hydraulic ABS unit, to try to get access to the downpipe. (Don't ask.) Anyway, ever since I've disconnected the lines to the unit, I've had really spongy brakes. The brakes were really firm, now they are CRAP!
I've bled the brakes a good amount of times already. Hell, I even bought some stainless steel braided lines to try to correct it. But it's still spongy as hell. What I have noticed is that after I tap the brakes, though, while it's all spongy, I press the brake again, and it's noticeably firmer. Actually firmer from when I first got the car. That's the kind of pedal feel that I want/need/long for...
Does anyone have any idea what went wrong? I've been told to just bleed many, many, many times more and it'll eventuall get better. I've also been told that the ABS unit may be faulty now. Someone help PLEASE!!!
I've bled the brakes a good amount of times already. Hell, I even bought some stainless steel braided lines to try to correct it. But it's still spongy as hell. What I have noticed is that after I tap the brakes, though, while it's all spongy, I press the brake again, and it's noticeably firmer. Actually firmer from when I first got the car. That's the kind of pedal feel that I want/need/long for...
Does anyone have any idea what went wrong? I've been told to just bleed many, many, many times more and it'll eventuall get better. I've also been told that the ABS unit may be faulty now. Someone help PLEASE!!!
#6
Racing Rotary Since 1983
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buy a Mity Vac.......... you will love it. bleed longest line first by using the vacuum of the Mity Vac to suck the fluid thru the lines. you will need to remove each bleeder and coat the threads w wheel bearing grease prior to bleeding so air doesnt bleed along the threads.
easy as pie. pedal hard as a rock. no mess as the fluid ends up in the Mity Vac container.
howard coleman
easy as pie. pedal hard as a rock. no mess as the fluid ends up in the Mity Vac container.
howard coleman
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built my own engine
howard- it is http://www.mityvac.com/
#11
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When I painted my calipers I used a two foot hose from the bleeder valvue and ran the other end into a container of brake fluid and pumped several times. This prevented air from getting back into the sys. and my brakes are nice and hard. Try this but work from the right rear, then left rear, front left, and lastly front right. I don't know why you decided to pull the ABS system though? Not something I would want to play with. I hope you at least got your DP on OK. Good luck. PS - You will most likely need to refill your brake res. several times during the process.
#12
http://www.speedbleeder.com <-- never used these but everyone says these things rock and make bleeding brakes a piece of cake. This and the Fumoto Oil drain valve are going to be my first mods ( http://www.fumotovalve.com/ ).
#13
2/4 wheel cornering fiend
Originally Posted by NeatlyMeated
I've been having the hardest time with my spongy, spongy, spngy-*** brakes. It all started about a few months ago. I tried removing the hydraulic ABS unit, to try to get access to the downpipe. (Don't ask.) Anyway, ever since I've disconnected the lines to the unit, I've had really spongy brakes. The brakes were really firm, now they are CRAP!
#14
One Neat FD3S RX7
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Thanx for the replies!
When I bleed all of the lines, they all pump nothing but fluid and the pedal becomes supremely firm. When I do the front-driver side though, the pedal just keeps pumping away, never getting firm. There are no air pockets released, just a continous flow of brake fluid. What happened!?
Kento, how do I bleed from the banjo bolts on the ABS unit? I have no clue about that. Since ur in Pasadena, you wanna help? I'll pay you. I'm getting really desperate with this.
When I bleed all of the lines, they all pump nothing but fluid and the pedal becomes supremely firm. When I do the front-driver side though, the pedal just keeps pumping away, never getting firm. There are no air pockets released, just a continous flow of brake fluid. What happened!?
Kento, how do I bleed from the banjo bolts on the ABS unit? I have no clue about that. Since ur in Pasadena, you wanna help? I'll pay you. I'm getting really desperate with this.
#15
2/4 wheel cornering fiend
You've gotta have someone depress the brake pedal while you get an open-end wrench with a rag surrounding each banjo bolt and line on the ABS unit, and carefully loosen each one just enough to bleed it. You may have to tap it lightly with a wrench to get all the air bubbles to rise to the top.
The problem, however, is that you may have forced some of the air bubbles down through the lines in your efforts to bleed the system at the calipers. If you don't get any air escaping out of the connections at the ABS unit, you may have to buy a couple of bottles of brake fluid, and use a vacuum bleeder at the caliper to get the air out.
The problem, however, is that you may have forced some of the air bubbles down through the lines in your efforts to bleed the system at the calipers. If you don't get any air escaping out of the connections at the ABS unit, you may have to buy a couple of bottles of brake fluid, and use a vacuum bleeder at the caliper to get the air out.
#16
DragonFly
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Originally Posted by apex_sideway
http://www.speedbleeder.com <-- never used these but everyone says these things rock and make bleeding brakes a piece of cake. This and the Fumoto Oil drain valve are going to be my first mods ( http://www.fumotovalve.com/ ).
i use speedbleeders in both my cars and love em, make bleeding easy and effortless for one person.
i have a mightyvac too, and as howard suggeted, another great tool for bleeding and just to have in general for testing stuff
#17
Lives on the Forum
I removed my ABS pump and reinstalled it when I replaced all the seals. I just hooked all the lines back up and bled the four calipers as normal; no problem.
If however one of the solenoids in the pump is sticking this could cause your problem. I know the pump I bought for spare parts had two sticky solenoids in it that wouldn't fully release the line pressure when you took your foot from the brake. That may have been caused from it sitting a long time; I'm not sure.
If however one of the solenoids in the pump is sticking this could cause your problem. I know the pump I bought for spare parts had two sticky solenoids in it that wouldn't fully release the line pressure when you took your foot from the brake. That may have been caused from it sitting a long time; I'm not sure.
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