I'm back to working on my brake project and just not getting it done. Still have soft pedal and it's takes way too much distance to stop. It's far worse from where is started with 2 Disc and 4 Drums that were not working good.

Here is rehash of what steps I have taken and maybe someone can help get me back on track. I'm still amazed I can't find a mechanic/shop in the Dallas area that could help me with my projects.

First I installed the Manny rear disc brake kit. Install was straight forward.
Bleed the system with the standard 2 man pump and release fluid method. Never felt right and the vehicle was not even remotely drivable.
Replaced proportion valve with Disc/Disc model.
Removed OEM MC and replaced MC with new one from O'rilly. Used the P30 (PN NMC1668).
Did not bench bleed. Bleed with 2 man pump and release fluid. Still pedal too soft and not drivable. Removed MC and put on bench and found front chamber not pushing fluid.
Replaced with another new MC from O'rilly same part number. Pedal pumped up tighter but it leaked between the fluid reservoir and cast metal piston. Still not drivable.
Replaced MC with new one from Autozone (PN NM1641 ). Purchased the Hupy bleeder. Bleed according to his directions which is RR moving to LF. Removed lots of air and pumped about 1/2 gallon of fluid through the system. Still not drivable, pedal too soft and vehicle does not stop. From 30 to zero takes about 1/4 mile.

So how do I go about troubleshooting the individual components? How do I test hydraulic pressure?

I'm hoping for someone to give me a systematic approach to resolve this and get this working.

Yes, I have spoke with Manny and I really don't think any of the calipers are defective.

Thanks Neil Fonville
1975 GMC II




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