Brake light comes on for a moment, intermittent... - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 10-14-2003, 09:35 AM Thread Starter
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Brake light comes on for a moment, intermittent...

I swapped in a mid eighties E350 master cylinder and a line lock to improve my brakes. Bench bled the master and bled the brakes after install, no air in lines as far as I can tell and no leaks. I've also removed the O-ring from the prop. valve a while back. Now after the swap when I press on the brakes the light comes on for a moment, then it goes away. This doesn't happen always either. Brakes seem to work pretty well, pedal feels good.

So, I'm just wondering if it's just the result of all the different components or maybe the master needs more bleeding?
The rear locks up before the front so I'm thinking of getting an adjustable prop valve and ditch the factory stuff (and pull the brake light plug [img]images/graemlins/smile.gif[/img] ).

On the other hand the rear was empty during the test run (and therefore light) but on the trail I run with 3 big tool boxes weighing probably over 100 lbs so it might behave differently there. Are adjustable prop. valves DOT legal if the factory stuff is removed?

Any input is appreciated. Thanks!
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post #2 of (permalink) Old 10-14-2003, 04:13 PM
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Re: Brake light comes on for a moment, intermittent...

In a stock system that's functioning properly otherwise, excessive looseness in the back shoes can cause that problem. But if that were the case you would have an abnormally low pedal, although it would feel good otherwise.

The only symptom that indicates bleeding is necessary is that the pedal is low on the first application but comes up if pumped quickly.

I have no clue on the legality question.
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post #3 of (permalink) Old 10-14-2003, 06:36 PM Thread Starter
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Re: Brake light comes on for a moment, intermittent...

I forgot to say that I have discs on the rear Ford 8.8. Also, I read Elusive in another post saying that the YJ/TJ master cyl. is sealed to the booster ?!? How is that supposed to work? Isn't the diaphrahm fixed to the pushrod internally in the booster? That would negate the need for any seal... I'm just trying to see if that would be an issue in my case.
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