Powermaster Issues

[RezVek]

Got my vacuum system in and working! I didn’t bleed the brakes and the pedal is a bit soft so I was planning a gravity bleed this weekend. My question is, do people pull the PM fuse now that it is out? I figure that would be a good idea and I believe it is the 30a on the bottom right. Any confirmation on fuse location or further thoughts on this?

 

[GNONYX]

Thanks for the replies. I checked RCG but couldn’t see any kit there and that manual will come in handy. I had seen that flowchart before but my issue does not have a brake light so according to the chart, system OK. But system not Ok lol…. it is so odd that the brakes work, but accumulator will not release a proper fluid amount back to the reservoir.

Who is RCG?
Thanks

 

[RezVek]

Who is RCG?
Thanks

Home

 

[RezVek]

This

 

[RezVek]

Not sure what I did in the 2 posts above, but both are links to Richard Clark’s

 

[LANDAU LIMITED]

Got my vacuum system in and working! I didn’t bleed the brakes and the pedal is a bit soft so I was planning a gravity bleed this weekend. My question is, do people pull the PM fuse now that it is out? I figure that would be a good idea and I believe it is the 30a on the bottom right. Any confirmation on fuse location or further thoughts on this?

I never pulled mine, never even thought about it.

 

[GNONYX]

Not sure what I did in the 2 posts above, but both are links to Richard Clark’s

Thanks for the info

 

[RezVek]

I bled the brakes but still had a soft pedal. I ended up removing the MC and bench bled it again. Bled RR-LR-RF-LF, did a slight adjustment on the rear shoes to tighten them up a bit, still have a soft pedal.

I had a mechanic friend come by (I trust him with any of my cars) and he noted the following:

“Seems there is good flow out the fronts when bleeding, but less out the rear.

Brake pedal won’t pump up after many applications.

There is a squeak coming from the MC that feels like it is possibly high pressure fluid being bypassed in the MC.”

I was advised that I needed to spare the lines compared to the PM system, but I couldn’t. The new MC had the connection sizes in the same location as the PM, big connection and big line in front port, smaller line and smaller port closer to firewall. would it help if I DID swap the lines? Getting fittings to make it possible to swap them? This does not seem right but im
out of ideas at this end.

Brakes do work, but are low and soft. I don’t think I want to just leave it like this, wondering if there are any thoughts on it. Bleed MC again? New MC, again?

 

[RezVek]

“spare the lines” should read “swap the lines”…. they each only fit in their respective ports. Swapping is not an option unless I redo the ends with proper fittings to move them, or buy/make adapter fittings.

 

[LANDAU LIMITED]

They fit only one way. If you can't lock them up and have a nice solid pedal you have something else going on.

 

[RezVek]

They fit only one way. If you can't lock them up and have a nice solid pedal you have something else going on.

Yea I will see if I can get out for a test drive tonight and see how they actually work.

 

[Anthony P]

“Seems there is good flow out the fronts when bleeding, but less out the rear.

did you use the PV-2 bleed tool? install it in place of the brake warning light sending unit on prop valve. tool keeps the prop valve centered so that volume of fluid can be drawn thru rear lines for flushing and/or bleeding. if not using tool, valve moves off-center reacting as if a line broke, limiting fluid flow.

link to tool => proportioning valve bleeding tool PV2 tool new | eBay


some sellers include to tool with a purchase of a brass prop valve... this seller shows cut-away how valve and tool work.

link => Buick Regal Grand National Disc Drum Proportioning Valve 1978-88 G-Body | eBay

 

[Anthony P]

adding to above....this thread linked below covers it without retyping...

Proportioning valve

Maybe someone can tell me if this statement is true or not A board member claimed that there's a little pin on the proportioning valve that should be depressed while bleeding, is this true or false?

www.turbobuick.com

 

[RezVek]

adding to above....this thread linked below covers it without retyping...

Proportioning valve

Maybe someone can tell me if this statement is true or not A board member claimed that there's a little pin on the proportioning valve that should be depressed while bleeding, is this true or false?

www.turbobuick.com

Thanks Anthony…… I’ve heard of this tool but have not looked into it as much as I should have. I will see if I can track one down locally. If not, I will get one on order!

 

[RezVek]

did you use the PV-2 bleed tool? install it in place of the brake warning light sending unit on prop valve. tool keeps the prop valve centered so that volume of fluid can be drawn thru rear lines for flushing and/or bleeding. if not using tool, valve moves off-center reacting as if a line broke, limiting fluid flow.

link to tool => proportioning valve bleeding tool PV2 tool new | eBay


some sellers include to tool with a purchase of a brass prop valve... this seller shows cut-away how valve and tool work.

link => Buick Regal Grand National Disc Drum Proportioning Valve 1978-88 G-Body | eBay

Just wonder if my prop valve is in an off center state, will this tool still go in and then recenter the valve?