What causes this light to illuminate?

I believe, based on the fact that your vehicle is "air over-hydraulic" brakes, that your master cylinder for the front brakes is reading low psi or low fluid level.

Now, if it was full (it's not) airbrakes I would suspect that it would be low air psi in either your primary or secondary tanks.

Turn on the key and make sure your air psi is 40lbs or less. Start up your coach. At around 60-70lbs your warning light for the low air should go out. If the center one goes out, then your bulbs are in backwards

I will let the air out of the system to check the "low pressure" light but as the pic shows there is nearly 100 psi in the low reading gauge... Are there two tanks? I think the light is saying low fluid level but I have yet to find the "front" resivoir.... The dash says "Fluid" between the Front and Rear warning lights... I asked about it but he said it's been ON since he owned the coach...

I dont't know if this applies to your Regency. Have you located the front reservoir, (master cylinder)? (Behind front tire) Post by Danny Z http://barthmobile.com/eve/for...061025752#6061025752
Here is another post that may be helpful http://barthmobile.com/eve/for...411029061#5411029061

On my 92' Breakaway it meant the brake resevior was low.
I have a spartan chassis. On mine it's a single resevior just inside the front grille for my generator access and just in front of where the drivers feet would be, mounted to the forward firewall. hope this helps

You may want to try and follow your front brake lines and see where they lead you.

I'm still sticking with my earlier statement.

quote:

Originally posted by Bill N.Y.:
I believe, based on the fact that your vehicle is "air over-hydraulic" brakes, that your master cylinder for the front brakes is reading low psi or low fluid level.

Bill, you're right in having him verify. That is most important. I was just stating that when we picked up the coach. The front calipers locked up. While bleeding them my light went on and it went off when we topped off the reservoir.

Having a little prior knowledge on this coach, I know that recently the ball joints have been replaced and there was work done on the steering system. I am by no stretch of the imagination a mechanic, but my thoughts were that if the brake lines had been tampered with during any of this and if the frt. master cylinder is that hard to find.... just a rookie guess

The master cylinder is located in the center (side to side) and approx 10' back from the front of the rig. Lots of room to work around it once you have slid under the frame.

Big reservoirs, bring lots of fluid!

Thank you... We found it and are tracking down the problem light... I'm leaning towards a bad sensor, but we'll see...

no i do not, i just noticed the message, now u have my attention

ok... Chris at MCR informed me that the sensor for the brake fluid in the master is NOT an autoreset type of sensor. It has to be manually reset. It is located on the master cylinder between the two wires going to the sensor. It looks like a pencil eraser and has to be pushed back in about 1/4" to reset it.. Mine is fine now and the light is off...

hey Patch, did u locate your Reservoir

Well, my coach was in the shop and the Mech. found it and reset the sensor.... But it is just behind the drivers seat in the center of the coach and there should be plenty of room to service it AFTER you climb under the side rail...
I take it you wanted to know where it is?
I also had the mech. drain, flush and refill the brake lines with Dot 5 (silicone) brake fluid...