Air pressure SP36 - Printable Version +- Wanderlodge Gurus - The Member Funded Wanderlodge Forum (http://www.wanderlodgegurus.com) +-- Forum: Yahoo Groups Archive (/forumdisplay.php?fid=61) +--- Forum: WanderlodgeForum (/forumdisplay.php?fid=63) +--- Thread: Air pressure SP36 (/showthread.php?tid=5498)

Air pressure SP36 - williamcharrison - 08-10-2007 03:43 I was waiting in line on a slight grade at a Flying J with my foot on the brake (probably 1 minute) and I noticed quite a drop in air pressure and then my steps came out. I set the parking brake until pressure came back up and the steps retracted. Is this normal, and if not, what corrective action need I take? Chuck Harrison Akron, Ohio 90SP36 Air pressure SP36 - Pete Masterson - 08-10-2007 04:36 No, it is not normal. You have an air leak. Below is an excerpt of the Air Brake Check from the California Commercial License DMV booklet. While this test isn't required for RVs, it is a good test of what's considered safe in an air brake system. Note that the fully charged system should not lose more than 3 psi in one minute with the brakes held on. It's time for some serious examination of your air system. In-Cab Air Brake Check NOTE: All items marked with an asterisk (*) are critical parts of the in-cab air brake test and must be demonstrated during DMV testing. They may be performed in any order. If these items are not performed correctly, it is considered an automatic failure of the pre-trip test. Test air leakage rate. (* second test only) * With a fully-charged air system (typically 125 p.s.i.), turn off the engine, release the service brake (brakes off), and let the system settle (air gauge needle stops moving). Time the air pressure drop. The loss rate should not be greater than: — 2 p.s.i. or less in one minute for single vehicles. — 3 p.s.i. or less in one minute for a combination of two vehicles. — 5 p.s.i. or less in one minute for a combination of three or more vehicles. If the loss is too much, check for air leaks and fix. * With roughly a fully charged air system (typically 100-125 p.s.i.), turn off the engine. Release all brakes and allow the system to settle (air gauge needle stops moving). Then apply full steady pressure to the brake pedal (brake on) and hold. After the system settles again, the air loss should not be more than: — 3 p.s.i. or less in one minute for single vehicles. — 4 p.s.i. or less in one minute for a combination of two vehicles. — 6 p.s.i. or less in one minute for a combination of three or more vehicles. If the air loss is too much, check for air leaks and fix. For testing purposes, identify if the air loss rate is too much. Pete Masterson '95 Blue Bird Wanderlodge WBDA 42 El Sobrante CA aeonix1@... On Aug 10, 2007, at 8:43 AM, williamcharrison wrote: > I was waiting in line on a slight grade at a Flying J with my > foot on the brake (probably 1 minute) and I noticed quite a drop > in air pressure and then my steps came out. I set the parking > brake until pressure came back up and the steps retracted. > Is this normal, and if not, what corrective action need I take? [Non-text portions of this message have been removed] Air pressure SP36 - Howard O. Truitt - 08-10-2007 08:19 Chuck, Losing air that fast is not normal check for an air leak. The operation of the step as you described is normal at least that is the way my step works. If it is not normal then we are both abnormal and I have been accused of that for years. Howard T., Sowega, 86 PT40 ----- Original Message ----- From: williamcharrison To: WanderlodgeForum@yahoogroups.com Sent: Friday, August 10, 2007 11:43 AM Subject: [WanderlodgeForum] Air pressure SP36 I was waiting in line on a slight grade at a Flying J with my foot on the brake (probably 1 minute) and I noticed quite a drop in air pressure and then my steps came out. I set the parking brake until pressure came back up and the steps retracted. Is this normal, and if not, what corrective action need I take? Chuck Harrison Akron, Ohio 90SP36 ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.476 / Virus Database: 269.11.10/943 - Release Date: 8/8/2007 5:38 PM [Non-text portions of this message have been removed] Air pressure SP36 - pattypape - 08-10-2007 08:38 This is not good , step extends at a low pressure of about 65 psi. There is a big air leak someplace, Spring brakes will soon lock up the rear wheel brakes at a low psi. Bill 88 FC Michigan --- In WanderlodgeForum@yahoogroups.com, "williamcharrison" wrote: > > I was waiting in line on a slight grade at a Flying J with my > foot on the brake (probably 1 minute) and I noticed quite a drop > in air pressure and then my steps came out. I set the parking > brake until pressure came back up and the steps retracted. > Is this normal, and if not, what corrective action need I take? > > Chuck Harrison > Akron, Ohio > 90SP36 > Air pressure SP36 - Bob Lawrence - 08-10-2007 12:39 The rear spring brakes lock up at 60psi per DOT. You probably have the rubber valve torn in the can. I just replaced both of mine (no problems, just precaution). The now have double cans to put on so you have a backup. When driving my 18 wheeler a couple of years ago going down a mountain ineastern Washington, one of the cans on the tractor sprung a leak and every time I put on the brakes, you could hear the hissing. Managed to make it down by really relying on the jake brake. Had it changed out on the side of the road. It is not a big job, but I wouldn't try it yourself as the brake can spring needs to be caged to release the brake. Drive slowly to a truck place or have them come out to you. Bob Lawrence 84 PT36 Tacoma, Wa. > > I was waiting in line on a slight grade at a Flying J with my > foot on the brake (probably 1 minute) and I noticed quite a drop > in air pressure and then my steps came out. I set the parking > brake until pressure came back up and the steps retracted. > Is this normal, and if not, what corrective action need I take? > > Chuck Harrison > Akron, Ohio > 90SP36 > Air pressure SP36 - williamcharrison - 08-13-2007 01:16 Hi Bob, The cans you mention, are they the brake actuators located outside the rear wheels? Chuck Harrison Akron, Ohio 90SP36 --- In WanderlodgeForum@yahoogroups.com, "Bob Lawrence" wrote: > > The rear spring brakes lock up at 60psi per DOT. You probably have the > rubber valve torn in the can. > I just replaced both of mine (no problems, just precaution). The now > have double cans to put on so you have a backup. > When driving my 18 wheeler a couple of years ago going down a mountain > ineastern Washington, one of the cans on the tractor sprung a leak and > every time I put on the brakes, you could hear the hissing. Managed to > make it down by really relying on the jake brake. Had it changed out on > the side of the road. > It is not a big job, but I wouldn't try it yourself as the brake can > spring needs to be caged to release the brake. > Drive slowly to a truck place or have them come out to you. > Bob Lawrence > 84 PT36 > Tacoma, Wa. > > > > > I was waiting in line on a slight grade at a Flying J with my > > foot on the brake (probably 1 minute) and I noticed quite a drop > > in air pressure and then my steps came out. I set the parking > > brake until pressure came back up and the steps retracted. > > Is this normal, and if not, what corrective action need I take? > > > > Chuck Harrison > > Akron, Ohio > > 90SP36 > > > Air pressure SP36 - Bob Lawrence - 08-13-2007 06:28 Why yes, they are. Easy to spot, only round cans inboard of rear wheels.Bob Lawrence 84 PT36 Tacoma, Wa. > > Hi Bob, > The cans you mention, are they the brake actuators located outside > the rear wheels? > Chuck Harrison > Akron, Ohio > 90SP36 > > --- In WanderlodgeForum@yahoogroups.com, "Bob Lawrence" > wrote: > > > > The rear spring brakes lock up at 60psi per DOT. You probably have > the > > rubber valve torn in the can. > > I just replaced both of mine (no problems, just precaution). The > now > > have double cans to put on so you have a backup. > > When driving my 18 wheeler a couple of years ago going down a > mountain > > ineastern Washington, one of the cans on the tractor sprung a leak > and > > every time I put on the brakes, you could hear the hissing. Managed > to > > make it down by really relying on the jake brake. Had it changed > out on > > the side of the road. > > It is not a big job, but I wouldn't try it yourself as the brake > can > > spring needs to be caged to release the brake. > > Drive slowly to a truck place or have them come out to you. > > Bob Lawrence > > 84 PT36 > > Tacoma, Wa. > > > > > > > > I was waiting in line on a slight grade at a Flying J with my > > > foot on the brake (probably 1 minute) and I noticed quite a drop > > > in air pressure and then my steps came out. I set the parking > > > brake until pressure came back up and the steps retracted. > > > Is this normal, and if not, what corrective action need I take? > > > > > > Chuck Harrison > > > Akron, Ohio > > > 90SP36 > > > > > >