Need some advice or suggestions for which brake booster I should focus work on.
I presently have a Midland C3388 (AKA: C462, 518026, RV46201x, B7034) it appears to be the only booster ever installed on the truck, can't guarantee it though. It needs rebuilt - mostly due to a tear in the main power diaphragm, second there are internal fluid leaks.
I also have what should be the factory correct Bendix 374000 (AKA: 518028, B7027, 2208488) at least has a problem with the control valve leaking/admitting atmosphere to the rear of the can or not admitting vacuum, when installed and hooked up brakes are on hard.
Finding a complete unit on the shelf isn't happening. I'd prefer to rebuild one of them, or second, send one in for rebuild.
First, which one is more powerful (my guess is the Midland)?
Second, which one will I have highest chance of success in rebuilding (I'm leaning towards the Midland again)?
So my plan is to try getting the Midland fixed for the two reasons above. However, if I can easily figure out the problem in the Bendix, I'll use it, because documentation says its what should be on there anyways and I can be back on the road sooner, maybe cheaper.
I've had the Bendix all torn down and inspected and replaced some parts from a similar kit, the interior of the can is a bit rough. The hydraulic brake piston and bore is reasonable. The control valve hydraulic piston and cylinder also seem acceptable. Leads me to think there is a problem with the control diaphragm (not the original, maybe its too long), springs or poppet (not original either) being pushed or held open.
