Each type of abs system has a section that describes how that particular system functions, what the major system components are, the basic diagnostic procedures for that system, and lists fault codes for diagnostics. Plc abs diagnostics windows 95, 98, 2000, nt, xp and vista. A pressure or vacuum bleeder is preferred over using the brake pedal for this procedure. Here is how to fix spongy brake pedal feel on a 1988 to 1998 chevrolet silverado truck. If a pressure bleeder is used, the combination valve must be held open. To bleed the back side of the abs system you sometimes have to jump through a few hoops. Each section is divided into an isolation valve and a. More than 100 years of intensely focused innovation, haldex holds unrivaled expertise in brake systems and air suspension systems for heavy trucks, trailers and buses. This abs module is found on many chevrolet vehicles, including the silverado, s10, tahoe, and suburban. Low pedal on vehicles equipped with kelsey hayes ebc310ebc325 ebc410 abs systems.
There are slight differences in the external look to the. Kelseyhayes 310 abs module on hold this rebuild requires removing your module. Kelsey hayes 325 abs module repair solutions c0265. Ford calls their version of kelseyhayes ebc2 system rabs for rearwheel antilock brake system. Hydraulic abs brake habs navistar service software. The kelseyhayes rear wheel antilock brake system was first used by ford in 1987 on f series trucks, and was later added to the ford ranger, bronco, bronco ii, explorer, aerostar and econoline vans. Masterdiagnostics md32 is used to diagnose international engine problems. Hydraulic abs brake habs international hydraulic abs fleet is used to diagnose kelsey hayes, lucas varity, and trw ross hydralic abs brake systems. The kelseyhayes 4wheel antilock 4wal brake system is used to prevent wheel lockup during heavy braking. Bleeding the abs brake control module may be a option that is necessary to complete the bleed process. They have been developed for the sole purpose of diagnosing and repairing automotive electronic systems.
International hydraulic abs fleet is used to diagnose kelsey hayes, lucas varity, and trw ross hydralic abs brake systems. The first hayes trailer brake controller was invented by the kelsey hayes company in detroit michigan in the 1950s. How can i get air out of the abs module without scan tool. Gm gm gmc isuszu kelsey hayes abs module failing causing the abs. General motors chassis application 19862004 zr1 net registry. I had no access to the tech ii or a bidirectional scan tool to cycle the abs modulator. The intellectual property of kelseyhayes company includes 264 registered patents primarily in the vehicles in general category.
Low pedal on vehicles equipped with kelsey hayes ebc310. For 1998, kelseyhayes has introduced the ebc325 abs system for light trucks. Basic functions read fault and clear diagnostic fault codes view and save brake data advanced features brake bleed test graph paramaters snapshot navistar habs can be run on most pcs with a least 512 mb ram 1 gb perferred, 10 mb available hard drive space, and cdrom running. Navistar habs diagnostic software is used to diagnose kelsey hayes, lucas varity, and trw ross hydralic abs brake systems. Navistar hydraulic abs fleet used to diagnose kelsey hayes, lucas varity, and trw ross hydraulic abs brake systems. Also many other abs system can trap air in the solenoid valves. This comprehensive course introduces participants to the system level design considerations. This 23 piece car opening set is a great starter set for the budget conscious entry level set tool id system high quality inthedoor tools best selling accessories included the access tools value set includes the most common inthedoor. The rwal system on 199196 chevy s10 and s15 pickups, chevy blazer, gmc jimmy, 199295 chevygmc suburban and 199095 chevy astros have been the subject of numerous investigative reports by various news media, the target of a class action lawsuit. View and download innova gm 3123 owners manual online. When your antilock brake system is on the fritz, heres how to fix it. Bypassing dump valve in modulator allowing fluid into the low pressure accumulator solution. I would first get the basic brake system bled first, that helps morale. I will be using a snap on solus ultra to bleed the abs brake control module on this chevy.
The kelseyhayes 4wal abs system has been used on many gm light trucks through the years. It is an easy job taking 20 minutes and the new module works fine. Low pedal on vehicles equipped with kelsey hayes ebc310ebc325ebc410 abs systems cause. It has three sections one each for the left and rightfront wheels, and a third for the rear axle. The modules have an internal relay andor transistor that fails causing the abs pump to run continously. Additionally, kelseyhayes company has registered 6 trademarks with the most popular class being vehicles.
International md32 is designed specifically to work with international engine control modules, available with the fine family of international engines. Once reserved for highend luxury vehicles, electronic brake control systems are now required standard equipment on even the most inexpensive cars and trucks. Full abs functionality restored 2 business day rebuild bench tested fiveyear warranty against return failure. So chances are pretty good youll tangle with one real soon.
In 1990, kelseyhayes introduced a new fourwheel antilock braking system. These original trailer brake controllers were hydraulic over electric and required a direct tie in to the tow vehicles air or hydraulic braking system. Be sure to watch the you tube video how to remove and replace a kelsey hayes 325 abs module especially in. You will find it on the 1998 dodge dakota, isuzu rodeo and kia sportage. We can repair failed abs modules also known as ebcm electronic brake control modules for gm trucks and suvs built after 1999 with kelsey hayes 325 control modules. Hydraulic abs is used to diagnose kelsey hayes, lucas varity, and trw ross hydraulic abs brake systems. However, a bidirectional scan tool with the appropriate software is necessary.
If we are to assume there really is air trapped in a chamber, you need to open that valve to let the air out, but there has to be brake fluid under pressure ready to take its place. To meet this challenge, however, there may be some sacrifice in pedal feel and. Be sure to watch the you tube video how to remove and replace a kelsey hayes 325 abs module especially in order to release the gm connectors. To bleed the system without it you can open the bleed valve one wheel at a time you can leave the master cylinder cap off do not press the peddle during this way of bleeding let. If your truck only has rearwheel abs, please see our ford rwal abs rebuild. Buy products related to abs module products and see what customers say. If you have a module like the kelsey hayes one on my truck in the video, you can use the bleeder valve on it to bleed the bubbles out, and then you need to bleed the brakes on all the wheel. Service bleeding the bpmv is rather complex on the kelseyhayes 4wal system. To bleed the abs system there is a special c clamp that you put on the abs unit to collapse the pistons to open them to remove traped air as you bleed the brakes. Navistar habs diagnostic software diesel diagnostic. So off to a vacant parking lot i went and a few hard, sudden stops later i rebled the brakes. This allows driver to maintain steering control while stopping vehicle in shortest distance possible. Kelsey hayes abs ebcm module repair for gm trucks and suvs.
Remove the abs module module only not the hydraulic pump and cover the electrical connectors with tape. There is still the same fluid path, just a little bit longer and with a bit more volume. Bleeding the abs brake control module,on a chevy using a. Truck has 97,564 miles but now i cannot use because i think controller does not provide pressure to.
Airbag module reset software may erase some soft codes, but will not. Spongy abs brake fix 88 to 98 chevrolet silverado youtube. Please complete the following troubleshooting guides before sending in your kh 310. Heres the trick, get the brakes bleed as stated above and youll likely find you have a good pedal. The teves and kelseyhayes systems bleed the same way. For 1998, kelsey hayes has introduced the ebc325 abs system for light trucks. Details about ford f150 f250 expedition navigator kelsey hayes abs control module repair. You will need to remove the abs fuse to prevent the abs pump from burning out andor the battery going dead. Get the best deals on abs system parts for nissan frontier when you. The kelseyhayes 325 ford module was specifically built for ford trucks with 4wheel abs.
The preferred method is to cycle the abs system using a factory scan tool or an aftermarket prolevel scan tool that has bidirectional capabilities so it can access the abs system and cycle the pump and solenoids. With the kelseyhayes system on the internationals, however, the system remains active and defaults to what international refers to as extended braking mode. The electronic control unit ecu of the 4wal system is attached directly to the business part of the system the brake pressure modulator valve bpmv. This is a kelsey hayes 325 abs module repair and upgrade service for chevrolet vehicles. Connecting to obdi vehicles snapon abs guide software aa1car. Whenever we had wiring problems it was a hunt down from the beginning but once you find good information showing you how to carry out a step by step process its much easier to be successful to find the fault. The abs system used on 95 through early 2000s gm trucks is the kelseyhayes ebc310. The ebc325 system is a lightweight, compact, four wheel three channel system that includes special dampening to reduce noise during abs braking. We were working on a thomas c2 conventional school bus at the time and what happened was a break down in communication between the abs module and the rest of the system. The gm chassis application software is used to diagnose and troubleshoot. Scanners will command the controller to run the pump or pressurize the fluid. We did repairs on these systems before they had two way scanning capability. Internationals with lucas hydraulic abs school bus fleet.
Kelseyhayes rear wheel antilock rwal systems have been gotten a bum rap in recent years. The abs system, when its idle, does not affect the brake system. Antilock brake guide diagnostic training repair software aa1car. Today, nearly every new vehicle benefits from the optimized braking, enhanced acceleration, or improved stability that these systems provide. Thats what i had to do with a old tahoe that had the kelseyhayes 4wal abs system. Brakes can be bled in the usual way manually or with pressure equipment. It is true that on most abs systems when a malfunction is detected, the system is disabled. The ebc310ebc325 system is used on gm, ford and some dodge light trucks and suvs. The system consists of electrohydraulic control unit ehcu, vehicle speed sensor vss, vss buffer, wheel sensors. Kelseyhayes ebc systems teves mark 2 teves mark 4 teves mark 20 sumitomo toyota rear wheel abs a handy reference list of abs systems by. Navistar habs can be run on most pcs with a least 512 mb ram 1 gb perferred, 10 mb available hard drive space, and cdrom running in the window xp operating system.