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Dodge W250 brakes

J

JimS

Member
I have a 1990 Dodge diesel W250. As most know the brakes were never great on these trucks. I had a sudden loss of braking ability. It still stops but with greater effort. Its either the booster or splitter. There isnt really a diagnostic method to determine if that odd splitter/balancer valve is bad.

I got to thinking, it would be nice to replace everything, booster, master, splitter, etc. Is there anyone that makes a complete rebuild kit, performance or otherwise? How would I search for one?
 
To see if there is an imbalance in the applied braking, you could put the truck in a field or grass, and pull it while holding the brakes hard enough to slide tires. If front of rear tires do not lock up, the proportioning valve could be at fault. If both ends are working the vacuum pump (as mentioned) or diaphragm, or control valving in the booster are possible faults.
The following is a sample of the potential for improving the action of your truck's brakes, I have experience with Wilwood, and Summit. Jim

Complete Big-Brake Conversion Kits for your Truck - Wilwoodhttps://www.wilwood.com Trucks Index

Bigger Brakes for Bigger Tires and Wheels - RealTruck.comhttps://realtruck.com blog bigger-brakes-for-bigger-...

Disc Brake Conversion Kits at Summit Racinghttps://www.summitracing.com search part-type di...
 
Got into that on a Dodge about that vintage.

Started out intermittent, ever so often hit the brakes and just get a hard pedal, non assisted.

Rigged up a vacuum gauge I could see when driving, finally caught it, good vacuum, but no assist.

A rebuilt booster/master cylinder assy fixed it.
 
It could be frozen calipers, or even the slider pins too. I would take it and try to make it skid all 4 wheels. I would think it more likely than the booster. Mark.
 
Check that you're getting vacuum to the booster. Stick your head in the footwell and listen for a hiss when you shut the engine off.

I'm going to say it's the booster or vacuum pump. When the ABS valve goes bad, the pedal goes soft.

The 7.3 powerchoke used the same vacuum pump diaphragm, or you can swap in the rotary pump off a second gen.

Those brake systems are weird, guys have replaced a stuck caliper, and had the brake light go out with no other work done. And they're really not that bad when they're working right.
 
i have a 99 power stroke. i don't have a vacuum booster. if i remember right the brake system uses power steering oil pressure as a brake booster. my 98 diesel uses a booster and vacuum pump however.
 
To see if the vacuum booster is not working pump the pedal about 4-5 times engine off, let off and step on the pedal and hold it. Start the truck. The pedal should fall 1-2 inches. To see if it holds vacuum shut the truck off. You should have at least 2 soft pedal applications before it gets hard. If it fails either test more tests are needed but you have narrowed it down to either vacuum supply or a check valve respectively.
 
(quoted from post at 07:15:10 08/27/21) There were no 98 powerstrokes.
I think the 99-02 still had vacuum for climate controls.
Dodge didn't step up to hydroboost til 03, i think.
Click to expand...

Yeah, there were. Ford brought the Powerstroke out in 1994.5
 
The last OBS f250/f350 were 97s. All
super duties were model year 99-up.
There's early and late 99s, I think it
was March of 99 they made some changes
and moved the powerstroke emblem from the
fender to the door.
 
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