So here is my issue. 03 Ram 2500 5.9L quad cab 4x4. My power steering seems fine but my brake pedal is stiff. Almost the same if the truck is running or not. I found a hydro boost with master cylinder for an 06. Will that fit my 03? Also anyone think the problem may be different than what I think? Thanks all!

 

It should. Autozone parts catalog show the same part from 2003 to 09.

 

Thank you. I read if the pedal feels the same whether running or not it was the nitrogen cylinder on the hydroboost lost its charge. Any one able to verify that?

 

Nitrogen cylinder? There is an accumulator on the side...... I wasn't aware of a nitrogen cylinder.

 

yes the little can. It's typically blue. Nitrogen accumulator I guess. Holds a nitrogen charge.

 

Erm, no. That's the accumulator for P/S fluid. It holds a bit of pressure so if the engine stalls, you still get power brakes for one or two pumps. No nitrogen involved.

 

Given that the box for a hydroboost unit says there's an inert gas under pressure, I would wager that there is indeed an inert gas under pressure within the hydroboost unit.

I've replaced a couple on 2012 F450s this summer, but those were from fluid leaks.

 

Ah. Ok, after doing a bit of research..... seems there are two types of accumulators... the spring type (which is what I am used to) and the inert gas fellers, that use nitrogen instead of a spring. Interesting.