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Old 03-07-2005, 11:01 PM   #1 (permalink)
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Brake Problems Rabs valve question

I've got the whole low spongy pedal thing going on, and it's driving me crazy. Back brakes are adjusted properly and I think that the system is bled properly. I did notice that the back brakes kind of drizzled fluid out while bleeding,while the fronts squirted real good. (I know it sounds kinda funny). I was reading the archives and i'm led to suspect the rabs valve. How much does it cost, and what can I check. How do you bleed it. Also, while bleeding the master cylinder, fluid came out slowly from rear line, but gushed from front. Any ideas??
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Old 03-08-2005, 05:50 PM   #2 (permalink)
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Re: Brake Problems Rabs valve question

does anyone have any suggestions I might be able to try. I'm going to attempt to bleed the valve tonight, but I'm pretty much going in blind
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Old 03-08-2005, 09:33 PM   #3 (permalink)
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Re: Brake Problems Rabs valve question

The RABS valve is not cheap. It bleeds like all the other brake system stuff (it has a bleeded valve on it). Sometimes rubber brake hoses will almost "swell" (collapse???) shut internally, but I wouldn't expect that for our trucks as they aren't that old. Cheers!
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Old 03-08-2005, 10:13 PM   #4 (permalink)
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Re: Brake Problems Rabs valve question

The booster can cause a spongy feeling too. Mine feel that way when I'm not moving and push hard on the pedal. I can get it almost to the floor. When driving, however, It feels normal, and if I push it more than a quarter way down the tires lock up.
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Old 03-08-2005, 11:08 PM   #5 (permalink)
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Re: Brake Problems Rabs valve question

I'm going to bleed that damn valve and see what it does. My brakes have not been working well for a long time, maybe thats the problem
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Old 03-09-2005, 09:55 PM   #6 (permalink)
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Re: Brake Problems Rabs valve question

For what it is worth....my brakes felt weak and I have about 112k on the truck, so I had the brake fluid changed...it seemed to help the brake feel and power a bit. I have bled my brakes in the past, but I must have missed some air in there somewhere.

I still think that the brakes are a weak link on this truck, but they are better since the fluid change...you might want to give it a try.
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Old 03-09-2005, 11:39 PM   #7 (permalink)
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Re: Brake Problems Rabs valve question

Good point. Use a pressure bleeder if possible. Keeps air out of the system while bleeding.
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Old 08-02-2005, 03:42 PM   #8 (permalink)
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Re: Brake Problems Rabs valve question

[ QUOTE ]
I'm going to bleed that damn valve and see what it does. My brakes have not been working well for a long time, maybe thats the problem

[/ QUOTE ]

Hi, looks like I am in the same boat again. I had the brake fluid replaced and the brakes felt pretty good for a couple of months and now they are back to feeling like crap again. I cannot lock up my front wheels. If I slam the brakes on I can hear what sounds like hydralic wheeze and the pedal does not go to the floor.

If feels like I have air in the system again. I have checked my vacuum pump and it is fine. I do not lose any brake fluid. I just adjusted the rear brakes...no change.

Did bleeding the RABS value help? Anyone have any ideas on how I could be getting air in the system again?

The truck has over 100k on it and it has never really braked properly from what I remember....

Thanks!
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Old 08-02-2005, 03:59 PM   #9 (permalink)
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Re: Brake Problems Rabs valve question

Howdy,
I had a similiar problem about a month ago. I replaced my RABs as well as my master cylinder. I was experienceing the same problems y'all are describing. The RABS ran about 170.00 +/- friom O'rielly's with a 50.00 core. I don't recall what the master cylinder ran but I don't believe it was more than 100.00 and it had a core charge as well. I replaced these parts because I could not get the spongy feel out of my pedal. Also I went with new parts for two reasons, 1) my truck has 300K on it and 2)we had the money. Neither was hard to replce and the guys at O'reillys were helpful. If you have more questions feel free to IM me. I can dig up my reciepts and give you an exact price on what it cost me. Oh yeah, I also bled all of the old fluid out of the system and replaced with new fluid. Thanks to some local drivers here in Dallas I can atest to the fact that my truck stops quite well now.
Take Care,
Craig
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Old 08-05-2005, 02:34 PM   #10 (permalink)
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Re: Brake Problems Rabs valve question

Hello,
I checked with the engine off and the pedal pumps firm and stays high. Can anyone tell me if I can do a test on the master cylinder booster?

The Ford dealer wants $350+ for a rabs valve. Does anyone have a Napa, Checker, or AutoZone part number for it?

The brakes were much better after the fluid was changed, but now they are as bad as ever, maybe even worse than before.

Thanks in advance for any help!

Dtrux
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Old 08-11-2005, 03:56 PM   #11 (permalink)
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Re: Brake Problems Rabs valve question

I had a similiar problem when I first bought my truck. I replaced my RABs and master cylinder and still had the problem. I almost pulled what is left of my hair out looking for the problem and finaly found it. When the brake pads were replaced before I bought the truck, they did not replace the clip on the wheel nut and the nut had backed off.
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