Question about 2004 Dodge Ram 2500
1994 Dodge Truck 2500. The brake peddle goes to the floor intermitantly. Doesn't always do it, usually only when rpm is low and coming to a slow stop. The master cylinder has been replaced three times at a garage. Twice with a rebuilt, and once with a new. Can not get peddle to drop when truck is not in motion. It feels just like a bad master cylinder, but it's intermitant. This started happening after left front hose broke, and I had it replaced. There is no fluid leaks anywhere. I also have bled system at least twice as per repair manual, and Publication No. 81-37014106
The problem may be that the master cylinder needs to be bench bled,there is most likely air trapped in the piston of the master cylinder.The problem comes from the piston not being fully actuated when connected to the pedal assembly.A vacuum bleeder will generally pull it out.
Posted on May 25, 2009
I was going to say brake booster. but you had the problem after front brake hose broke. you still got air in system .what sequence or what brakes did you bleed first.
Posted on May 25, 2009
The Kelsey-Hayes 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. Ford calls their version of Kelsey-Hayes EBC2 system "RABS" for Rear-wheel Antilock Brake System."
The GM RWAL version is found on '88 and later "C" and "K" full-size pickups, "S" and "T" series pickups, some "S" series Blazers, '89 and up Astro minivans, '90 to '92 "R" and "V" series light trucks and "G" series vans.
Dodge has also used the Kelsey-Hayes RWAL system since '89 on its "D" and "W" 150/350, Dakota and Ram pickups. Geo, Isuzu, Mazda, Nissan and Subaru have used the system since 1991.
Considering how many Ford, Chevy, GMC and Dodge trucks have the Kelsey-Hayes rear wheel antilock brake system, it's not surprising that a certain number of these vehicles would experience some kind of problem during their lifetime. NHTSA says there's no inherent defect in the system, so any failures that occur are the result of normal service conditions.
One of the most unnerving failures that can occur with this system is the loss of pedal when braking. The problem may feel like a bad master cylinder, but it may not be the master cylinder. The real problem may be a bad Electro Hydraulic (EH) valve in the rear wheel antilock brake system.
If a small piece of dirt or rust gets into the unit, it may prevent the dump valve inside the EH valve from closing. The dump valve will then leak fluid into the accumulator when the brakes are applied. The misrouted fluid allows the pedal to drop, and the pedal may go all the way to the floor without applying the brakes. No ABS warning light or fault code will be found either because the limited diagnostics on this system can't tell if the dump valve is fully closed or not.
Wagner Brakes recommends the following procedure
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Posted on Jun 03, 2009
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Posted on Jan 02, 2017
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