Short answer? NO...
If the system is properly adjusted, and there are no leaks, the manual brake system should be fine, and stop the car ok. Takes a bit more footie pressure than power fer sher, but it should still stop with no drama.

We're not trying tuh talk ya out of installing a PB system, Terry...just givin ya info about how it is....it is not a simple 30 minute deal. The booster will fit the pedal brace, but you will need to poke the two holes for the lower studs in the firewall...not really a big job. It's just time consuming...not overly complicated.

  Plan on removeing the Gauges and doing most of the Work threw the Hole. Mine is a Late C3 so its not that hard to remove the Speedo tach but I'm not sure about the early Cars. Having the Seat out is a Good Idea to. If there is any Dash Work or Replacement I'd have the Parts ready so You can do it all at once.

Good idea to replace all the light bulbs when out.

Hey guys? I just did the right side of my '82 with calipers and I'm pretty sure I have to do the other side. I've done pads all around and replaced the front flexible lines. After all that, I've got worse brakes than when I started.

All this talk of it being a tough job and cursing and throwing and breaking things out of anger is exactly why I do this as a hobby and not a job.  When I run into a frustrating situation on any car project, that's when I call it a day and go do something else.  Mabe the yard needs mowed or the gutters need cleaned out, something that requires no brain power.  Get back to the car project the next day or the next weekend. 

A few years ago I made the mistake of setting a goal for myself of finishing a custom engine swap at least a month ahead of a big national show in Las Vegas.  I worked furiously for months and finally started the engine for the first time only two weeks before the show and there were of course "bugs".  There was no way I was going to be confident enough to drive the car on a 2,600 mile round trip right outta the box.  I'd lost a brand new high-performance fuel pump in the middle of the Arizona desert on an earlier project and sat out a few days awaiting Fed Ex with the replacement.  I wasn't going to risk that again.  I decided at that point, no more goals or artificial deadlines.  This is just a hobby.  Instead, I flew to Vegas and enjoyed the show without my car that year.  I worked out the bugs over time and drove it later to another big show in Toronto just to get that road trip that I'd been so looking forward to.

This car hobby is just so much more fun when you can set it aside when you get frustrated and not worry about deadlines and such.

Phil

[QUOTE=pdupler]This car hobby is just so much more fun when you can set it aside when you get frustrated and not worry about deadlines and such.

Phil
[/QUOTE]

Hello, Gale Banks 80 - regarding the reference to a late model GM brake booster - is there is swap?  What year GM are you talking about?  Is this a bolt on?