Hydraulic Brake Booster Pdf' title='Hydraulic Brake Booster Pdf' />FAQs rv. Auto. Park. Chevy P3. Workhorse Chassis, J7. Version I, II, III Auto Park Brake System troubleshooting, repair Motor Home support web site. AIRCRAFT SPRUCE CATALOG PDF DOWNLOAD To view the files youll need the Adobe Acrobat reader. If you dont have the Adobe reader, you can download it. AutoPark parking brake actuator troubleshooting, repair, and system flushing. If you have had a leaking actuator and have had us or someone else repair it, there is. Identifying characteristics The brake booster boost is produced by vacuum pressure. Distinguishing features 1 10 brake booster 2 Hydraulic unit. THE IMPROVED 3 LIGHT GENIE LAMP ACCESSORYThis package consists of text, circuits and diagrams that describe an auxiliary dashboard warning light system. It operates independently of, and in addition to the regular Auto. Park dash light. In this document, we are going to try to consolidate a whole bunch of stuff about the Genie Lamp instead of having it on four or five separate write ups. With the addition of this three light module, it is possible to monitor normal operation of the Auto. Park system, and also detect potential problems as they develop. Even more importantly, it provides real attention getting evidence of an imminent parking brake lockup. This is a device that most forum members should be able to assemble and install themselves with parts costing less than 2. NOTE  This modification pertains only to the Version II and Version III Auto. Park systems that run off of a dedicated pump and reservoir. It DOES NOT apply to the earlier version that runs off the power steering pump. To understand the whole concept behind the Genie Lamps, we need to first examine the Auto. Park idiot lamp setup that comes with the GM Auto. Park equipped chassis. The explanation is as follows Most so called idiot lights on a vehicles dashboard have earned this derogatory label because they merely indicate the presence of some particular quantity There is some oil pressure, but we dont know how much. The battery is receiving some  charge, but we dont know how much. One could argue that these lights are providing as much information as some drivers can understand or put to use. Once in a while, a simple on or off indicator lamp can indeed tell you most of what you need to know Door ajar might be a good example. Pretty clear cut one of your doors is not completely latched. Then for some of us with motorhomes, there is the Auto. Park Light.   In my view, it truly deserves nomination as one of the quintessential idiot lights of all times. Allow us to explain our harsh judgment On ChevyGM, or Work. Horse chassis built approx. GVWR is equipped with an Auto. Section I Trouble Shooting Guidelines Page 3 ABBREVIATIONS GENERAL INFORMATION AH Air over Hydraulics AP. Air Pack BE. Bendix brk. Brake CR. Park indicator lamp somewhere in the instrument cluster. While there are some variations in the wiring schema for units built during this period, all of the Auto. Park lights are fed by two different  signals 1. There is a pressure switch attached directly to the back of the actuator. This switch will turn the Auto. Park Light ON at pressures lower than 5. So if the Auto. Park system is seeing pressures anywhere from 5. Pressure Intensifier Unit Function Vacuum is applied to a large area diaphragm Diaphragm and hydraulic piston are pulled in a downward direction. TP99124 Revised 0900 1657924240 Page 2 Copyright Meritor WABCO, 2000 Printed in the USA WARNING To prevent serious eye injury, always wear safe. View and Download Chevrolet C6H042 owners manual online. CSeries 2002. C6H042 Automobile pdf manual download. Auto. Park Light. Interestingly tho, this switch has no influence upon anything else in the system. Whether it works or not, it basically has no effect on the drivability of the coach. The exception to this is if the switch develops a short to ground in which case it will blow the Auto. Park fuse and you WILL get a brake lockup. The shorts are quite rare though fortunately. Then we have the infamous Rotten Green Switch aka pump motor switch. When this switch senses pressures below 1. AND the Auto. Park Light on the dash. Thus emerges the rub  The Light switch turns the Auto. Park Light ON when the system pressure gets below 5. RGS turns the Auto. Park Light AND the pump ON when the system pressure gets below 1. So how do YOU know which switch turned on the Auto. Park Light  Answer  You probably DO NOT know Now Lets confuse the issue a bit more. Typical failure of the Light Switch will turn on the Auto. Park Light and it will stay ON regardless of what the RGS is or is not doing. But typical failure of the RGS Rotten Green Switch will also turn on the Auto. Park Light, regardless of what the Light Switch is doing. Soooo The Auto. Park Light goes on as you are travelling down the road. WhyYou could have an internal pressure leak in the Auto. Park system.   The RGS sees that there is not enough pressure and turns the pump AND the Auto. Park light ON.   If the leak is not too big, the pump can stay ahead of it and keep the brake from locking up but your pump is running overtime to make this happen. The RGS has gone bad and has turned on the pump AND the Auto. Park light.   Pressure will go thru the roof and soon rupture the RGS or some other component. Then, the brake will automatically apply. The Light Switch has failed, and turned on the Auto. Park Light.   Nothing in particular will happen as a result of this but it DOES mask whether or not the RGS is turning the Auto. Park Light and the pump ON or OFF. You do not really have an emergency, but the Auto. Park Light will not share this secret. Download Nikah Nama Form In Urdu Free there. So what are we to conclude from all this  Basically, we have a binary reporting system that gives us only a small amount of the available information. If the Auto. Park Light is ON, you may have a BIG problem, a modest problem, or almost no problem at all. If the Auto. Park Light is OFF, you may have a BIG problem, or no problem at all. Now is THAT a great idiot light or WHAT What to do We very highly recommend that anyone who has a coach with the J7. Auto. Park, build and install our Genie Lamp system. This is a simple and cheap less than 2. Most any DIY RVer can build and install it with no difficulty. Since the Version II and the Version III each have slightly different wiring diagrams, we will show the modified block diagram for both. These diagrams have the Genie Lamps inserted and will help you with your modification. Later in this document, we will give more specific information as to where the physical connections can be made. Version II Auto. Parks are found on approx. Version III Auto. Parks are found on approx. Here is the block diagram for the Version II chassis. The Genie Lamps are added to show their location as regards the circuit. Click on image to enlarge. The above diagram shows the insertion of the three Genie Lamps. This is the circuit you should use for coaches built between about mid 9. These chassis have both an Auto. Park function PARK position on the gear shift lever as well as a manual foot pedal that can apply the parking brake. The foot pedal will be located to the left of the steering column. On the next is the block diagram for the Version III Auto. Park system.   Again, the Genie Lamps are inserted into the circuit, and we will give more specific information on where the actual connections are to be made later in this document. Click on image to enlarge. In the next illustration, we will show you the different possible combinations of Genie Lamp illumination. All of them are important as they tell you what is happening in your Auto. Park system as you are going down the road. Learning to read these lamps will be as important as watching your fuel gauge, temperature and oil pressure. Click on image to enlarge. The previous illustration shows the different combinations your Genie Lamps may display. Some are normal, some are more of a problem, and some are serious enough to require immediate attention. The following is a legend that expands upon the different lamp conditions, and explains in greater depth just what each condition means. The following legend is meant to supplement the basic five part Genie Lamp Guide.