Self Braking?

[mtdawg]

My brother in law and I both have 2007 Dodge 2500s with 3rd gen. 5.9 Cummins. About a month ago we were returning from a joint trip with me following. Suddenly his speed decreased and I noticed a smell that did not seem to be coming from my vehicle. He later told me that his speed decreased and he was unable to maintain it regardless of how much he accelerated. This lasted perhaps 30 seconds then thing returned to normal. It happened again to him yesterday when he wasn't towing so the trailer is eliminated as being the problem. His research has turned up the possibility of his "hydroboost" going bad. Neither one of us has heard of this part. I've never had this problem he described, although he said that on the Cummins forum others mentioned it. Anyone familiar with this?

Thanks,
Jim

[ALJO]

He's probably talking about the Turbo on the engine

[mtdawg]

Originally Posted by ALJO

He's probably talking about the Turbo on the engine

After doing a little research I found out that the hydroboost is some type of device for the brake master cylinder. What I didn't find out was about the self-braking problem. It's an alternative to the vacuum boost and uses power steering fluid to assist the brakes. Who knew?

[Seann45]

Since diesel engines do not have vacuum the power brakes need a way to get power.. this is done from a line from the power steering.. I would not think that is the problem. Maybe the computer sensed a power train fault and put the truck in "limp mode" then the fault cleared and things returned to normal.. Have the dealer with a proper scan tool check the codes..