abs proportioning valve

[MMeier]

I bet the booster is bad. Tap in a guage and see what happens when you step on it. Without the engine running, it should go down a little and stop. If the diaphragm is bad, the vacuum will go to 0. Could try it running too. Should be the same results, but the pump might keep a little vacuum on it.

Yep, its the booster... had 26" of vacuum with it at idle, stepped on brake pedal and down to 5" or so. Think I'll just get the loaded booster with a new MC while I'm at it, pretty sure thats still the original also.

 

[PToombs]

Glad you found it!

 

[MMeier]

Will be going down to order it here shortly, should have on over the weekend. Would suck to plow into someone and destroy a prefectly good first gen !:{

 

[MMeier]

Its in and operating! Might still get rid of the ABS BS and enjoy a nice "firm" pedal. During a panic stop with everything hooked up, how far down does your pedal usually go? Or, I guess I should ask. . used to go down before you got rid of the ABS?

 

[PToombs]

On a regular stop, it would go 1/2 to 2/3 down. Now, only 1/4.

 

[rumblefish]

I just bypassed the abs on my 90 gasser. I blew a hole in the supply line going into the abs junk, so I figured it was an excellent time to toss it in the trash. Brakes are better then ever... ever being the past 3-4 weeks I've owned it.

 

[MMeier]

Can anyone tell me what size those Weatherhead fittings actually are... in case I can't find WH around here?

 

[Paychk]

Weatherhead® 252X3 = 3/16" O. D. tube; inverted flare X 1/8" pipe female

Weatherhead® 202X2 = 5/16" O. D. tube; inverted flare X 1/8" pipe male

 

[MMeier]

Thanks !!!!

 

[Wickstead]

Just found a link that explains how the rear Kelsey Hays brake device works:



Kelsey-Hayes RWAL Antilock Brakes



I am currently experiencing the exact problem they describe - "One of the most unnerving failures that can occur with this system is the loss of pedal when braking. "



PS - the Napa part number for the



"Anti-Lock Brake System (ABS) Modulator Valve - Rem"



is UP 570044 .

 

[Ncostello]

Once I unplug the controller behind the glovebox... can I remove the controller too and just leave the plug and wiring under there? I'd rather not even have the box under there either. Don't like spare parts along for the ride. Saves fuel!!!

 

[PToombs]

Yeah, pull it out! I think mine is in the garage... ... or maybe the barn? I just don't care! :-laf

 

[ZedMikey]

The fittings are:
202 x 5
252 x 3

I am pretty sure that these are weather head numbers.
...
James

Just bringing this back up to the top...

A few months ago, my master cylinder went out, and I replaced it. At the time, I was just getting laid off, so I decided to get a remanufactured master instead of a new one (yeah, yeah, yeah... I know... ). Then a few weeks ago, my brakes started acting up again, and I immediately suspected the reman master. Typical signs of a bad master... Fortunately, I discovered it was the ABS valve before I swapped masters again.

Anyway, I just bypassed my ABS using the part numbers James posted. It was quick and easy, and I didn't even have to bleed my brakes. I now have a solid brake pedal, and my rears are actually working! Amazing!