drewat2 Posted April 2, 2021 Share Posted April 2, 2021 When I release the park brake The dash light goes out. When I put the transmission in gear I get an audible alarm. This happens intermittingly. Usually get it to stop by switching back and forth from N to D. The brakes do release and am able to drive. Where do I look? Link to comment Share on other sites More sharing options...
Jim Byrd Posted April 3, 2021 Share Posted April 3, 2021 Most likely your problem is the pressure switch that is located on the Parking Brake Valve. It can be found directly below the knob that applies and releases parking brake. This a common failure and they are readily available at any parts store that carry long hauls commercial truck parts. Jim Link to comment Share on other sites More sharing options...
Dennis H Posted April 3, 2021 Share Posted April 3, 2021 Not only are they easy to replace, they are relatively inexpensive....Dennis Link to comment Share on other sites More sharing options...
Chuck B 2004 Windsor Posted April 3, 2021 Share Posted April 3, 2021 I agree with Jim and Dennis. Chuck B Link to comment Share on other sites More sharing options...
drewat2 Posted April 3, 2021 Author Share Posted April 3, 2021 Thanks all. I thought that this was the case but like to run things through the brain trust here 13 hours ago, Jim Byrd said: Link to comment Share on other sites More sharing options...
Fred L Posted April 3, 2021 Share Posted April 3, 2021 I had the same problem Became annoying. My unit used a Nason switch SM-1C-66R/WP28. Contacted Isaacs Fluid Power Equipment Co. $42.00, UPS in 3 days Called low pressure switch Good Luck Link to comment Share on other sites More sharing options...
saflyer Posted April 4, 2021 Share Posted April 4, 2021 I had the same problem. Had the switch changed by a respected shop. Didn’t really solve the problem. Usually the beeping only lasts a few seconds but worry it won’t stop someday. Don’t know whether to have it changed again by another shop or try something different. Ed. ‘05 HR Ambassador Link to comment Share on other sites More sharing options...
Dave Hinds Posted April 4, 2021 Share Posted April 4, 2021 I found on my coach that if I wait till full air pressure then release the brakes mine works as designed... Safe travels Dave Link to comment Share on other sites More sharing options...
windsorbill06 Posted April 8, 2021 Share Posted April 8, 2021 I've had the coach since new and have changed the Nason switch at least 5 times. Maybe more, I lost count. After replacement, the switch would be fine for about a year, then start to be intermittent, then finally complete failure if I waited long enough. I came across Bob N's article about the Nason switch replacement. I read his article and followed his advise about 3 years ago when I was fed up with another switch failure. Go up to the top of the home page and under 'browse', click the 'articles'. Then click 'tech papers' and look for "A close look at the Nason switch". I replaced my last switch about 3 years ago following that article and have had zero issues. Bob's solution really works. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now