hello i am a dealer with a 1992 dodge 250 4x4 cummins i have a intermitant brake failure at low speeds the pedal goes right to the floor no brakes at all we have done lots of replacing incl master cly calipers vacume booster wheel cylinders to know avail just woundering if this is a problem that any one has ran into and knows how to fix sure would like some advice on this one thanks

 

Wow, you guys were right. Don't take your truck to a dealer just fix it yourself. The dealerships come here for the answers anyway and then triple the price. Thanks guys!

 

If you've replaced all that, the only thing left is the RWAL dump valve.

 

blackfordd, way to help!

At least he's asking for help! Most dealers wouldn't bother!

 

Good point TonyB. Or maybe lots of dealers use these forums. Just a thought.

 

BTW guys, he didn't say he was a Dodge dealer. My guess is he's a used truck dealer who needs to get this thing fixed so he can make it safe to sell.

 

My bad.

 

we sure luv to here opionions like yours we have been in the used truck business for 15 years we sell 3to 400 trucks per year i thought i might get some good advise to a problem i have never ran into be for thanks for nothing and buy the way i have owned 90 dodge diesels in the past how many have you owned

 

Wait a second here, granted his first response was flip, but you have to admit once he considered you might not be a Dodge dealer he apologized.

Getting back to business, was it the RWAL dump valve?

 

Barclay, I don't know how much you've read on DTR but I know that you are a new member so we welcome you. Whether you are a dealer or not isn't the issue.

Assuming that you aren't familiar with the history of this case, Blackfordd is also a new member who just recently got a 1st gen Dodge and was planning to take it to his local dealership for service work. We were able to encourage him to do much of the work himself and that, in part, was the basis for his original comment.

All history aside, what you describe is not a common issue with 1st gen Dodges as far as I know. The only other part that comes to mind is the brake hoses themselves. If they are weak and bulge, it can affect brakes although I'd doubt that it would put the pedal to the floor. Master cylinder or booster would have been my first guesses. Since you've already replaced those and since it's low-speed related, it makes me wonder about the vacuum pump although I would have expected hard pedal instead of pedal to the floor. Have you checked it's operation?

Please let us know when you find out what it was so that we can better help the next person.

 

I had similar problem with older truck. Found to be front wheel bearings were bad with excessive play. This would cause caliper to collapse at slow speeds while turning. Then it would take several brake pedal applications to get brake pedal back.