MoparFins

Techical Discussions => Tech- - ELECTRICAL => Topic started by: Bob Schaefer on August 09, 2013, 05:06:31 PM

Title: Brake Indicator Light
Post by: Bob Schaefer on August 09, 2013, 05:06:31 PM
That said, Mopar Night at the local Cruise was fun.
Title: Brake Indicator Light
Post by: dana44 on August 09, 2013, 05:24:52 PM
It can also be an idication of an imbalance of the master cylinder, so check the fluid level first.
Title: Brake Indicator Light
Post by: Bob Schaefer on August 09, 2013, 05:56:31 PM
See, now that's why we come here.. I'll check that first thing in the AM. Thank you.
Title: Brake Indicator Light
Post by: Snotty on August 10, 2013, 08:57:33 AM
If the fluid is fine it could be the problem I have - the nut on the e-brake cable under the dash, next to the kick panel, could have worked loose.  If so, the warning light will come on because it thinks the brake is applied.  (The cable does not pull out and triggers the switch.)  I have to re-tighten mine about every three months.  (One day I'll get the right nut!!!)  It's worth a look.
Title: Brake Indicator Light
Post by: dana44 on August 10, 2013, 09:17:01 AM
That's the only other thing it could be, it is just a pressure switch, both hydraulic in the porportioning valve and unpressure switch at the emergency brake.
Title: Brake Indicator Light
Post by: Brian on August 10, 2013, 10:51:45 AM
Sometimes mine comes on in the wagon when the E-brake pedal does not come all the way up to break the circuit on the warning light.  Try pulling the E-brake handle, and lifting up on the back side of the pedal arm with your foot....light might go out then.

Title: Brake Indicator Light
Post by: Steve on August 10, 2013, 01:33:25 PM
Quote from: thrashingcows
Sometimes mine comes on in the wagon when the E-brake pedal does not come all the way up to break the circuit on the warning light.  Try pulling the E-brake handle, and lifting up on the back side of the pedal arm with your foot....light might go out then.

Beat me too it.
Title: Brake Indicator Light
Post by: Bob Schaefer on August 25, 2013, 08:58:11 AM
I have opened the resevoir, and it appears to be full. I have checked the switch on the E-Brake pedal, and with the pedal applied, I can manually operate the switch, but it does not change the light.
One question I have is, does that switch have 1 lead or 2? There is only 1 wire going to it right now, and no place for another wire. I don't see anything that may have come disconnected, but it's weird to me that there would only be 1 wire.


Title: Brake Indicator Light
Post by: dana44 on August 25, 2013, 09:12:17 AM
Yes, this is a one wire switch. It grounds out and sets the light itself. See if the wire that connects to the switch on the porportioning valve, when removed, shuts the light off. Wouldn't be the first time a sensor stops working. When was the last time the brakes themselves have been checked, adjusted, that kind of stuff?
Title: Brake Indicator Light
Post by: Bob Schaefer on August 25, 2013, 09:21:50 AM
Well, my friend who had the car replaced the rear brake lines and wheel cylinders. The front had been done previously. I will check the wire on the proportioning valve.
This is of the big differences between this and my Polara wagon... The Polara didn't have power brakes.


Title: Brake Indicator Light
Post by: dana44 on August 25, 2013, 09:38:23 AM
If the switch on the emergency brake isn't setting the brake light on the dash, then it has to be on the porportioning valve switch. Since this switch is a pressure switch for an imbalance, troubleshoot its reason for coming on. They tend to stay on when there is a problem and then go out when the problem is fixed, as in equal pressure resets the switch. So the brakes could be moving too much in relation to front/rear, or the fluid pressure within the master cylinder isn't pressurizing properly (low fluid check half tests), the other half would be one of the two piston cups leaking so only half the brakes (front or rear) are working properly.  If you can get someone to gently press the brake pedal while looking at the master cylinder reservoir to see if there is something weird there, like fluid moving in only one of the reservoirs or actually reversing and filling one may help diagnose. Remember, either put the cap back on or release the brake pedal real real gentle to prevent the MC from squirting fluid all over the place when done.
Title: Brake Indicator Light
Post by: Bob Schaefer on August 25, 2013, 10:59:37 AM
Thanks.
Title: Brake Indicator Light
Post by: dana44 on August 25, 2013, 11:17:37 AM
OK, so you have the issue isolated, now you have to troubleshoot the issue.
Title: Brake Indicator Light
Post by: Steve on August 25, 2013, 03:35:51 PM
You may need rear linings or the wheel cylinders are shot.
How much travel is there in the brake pedal?
Title: Brake Indicator Light
Post by: Bob Schaefer on August 25, 2013, 05:43:39 PM

Title: Brake Indicator Light
Post by: dana44 on August 25, 2013, 06:23:02 PM
That can do it. Get the rear tires in the air and adjust them properly, go from there. The porportioning valve, with the extra travel, says there is a problem with the rear brakes. The valve is saying there is a pressure imbalance front to rear, extra pedal is the symptom of the imbalance. Tighten them up and it should fix it.
Title: Brake Indicator Light
Post by: Steve on August 25, 2013, 06:31:04 PM
Hey Ed  Slap Slap

Take the star wheel apart and never seize or grease them real good.  Bearing grease will last for years and the adjusters will work great.  Replace as needed
Title: Brake Indicator Light
Post by: dana44 on August 25, 2013, 06:56:52 PM
Steve, he said they were rebuilt and replaced, they are most likely just out of adjustment. Of course, if you are going to pull the wheels, might as well check everything. I didn't want to be to patronizing on what to do.
Title: Brake Indicator Light
Post by: Bob Schaefer on August 26, 2013, 03:35:00 AM
Ok, so now this post belongs in the other forum, since it has become about my actual brakes... :-)
I have adjusted brakes before, but it's been a long time. I remember how to do it, for the most part, which would be pulling the wheels and drums. and adjusting the star wheel until there's just barely contact with between the shoes and the drums, yes?
Question though... I thought the drum brakes had self adjusters. Is it that they are just too out of whack from having been taken apart and redone? Perhaps not properly adjusted when they were put back together?
Anyway, when I get them apart, I will see.

Thanks, as always.


Title: Brake Indicator Light
Post by: dana44 on August 26, 2013, 05:23:09 AM
Yes, brakes are self-adjustable, backing up and applying the brakes, the star wheel is turned. They do need to be adjusted initially, sometimes they get a little stuck, or, something isn't right to begin with and they don't adjust or the star wheel is a little jammed up. You are right, turn the star wheel until the brake drum barely goes on and doesn't touch or scrape when  you turn the drum.
Title: Brake Indicator Light
Post by: Bob Schaefer on August 26, 2013, 04:49:03 PM
I adjusted them, but I think not enough. The pedal feels better, but the light is still on... I try more tomorrow.
Title: Brake Indicator Light
Post by: dana44 on August 26, 2013, 06:39:27 PM
OK. I don't think there is any way to reset the switch itself, given it is a pressure imbalance grounding switch.