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Username Post: brakes        (Topic#342763)
Randyd 
Forum Newbie
Posts: 16

Loc: w washington
Reg: 03-23-10
02-19-17 03:03 PM - Post#2677483    

65 Chevy II Nova power brakes from fact. PO put on front disc. brakes and dual master. I have a very hard pedal and it acts like drum brakes, very hard to stop. Went to CPP web site and pulled up trouble shooting for brakes. It passed all the test on power vacuum no leaks and holds vacuum, good vacuum from motor 20 inches. Installed new wheel cyl. on back, new calp. on front. I bleed brakes, good flow from all and no leaks. need HELP Randy



 
Ecklers AutoMotive
Shepherd 
Frequent Contributor
Posts: 1848

Loc: Lake George, NY
Reg: 11-11-15
02-19-17 03:29 PM - Post#2677488    
    In response to Randyd

Ok, so this was a complete conversion kit from Cpp? New booster, mc matched to the kit?



 
Randyd 
Forum Newbie
Posts: 16

Loc: w washington
Reg: 03-23-10
02-19-17 04:47 PM - Post#2677498    
    In response to Shepherd

No, just the MC and proportional value, which sits just under the MC. The booster is from original power brake set-up from GM. The MC is 1 inch. Randy



 
Shepherd 
Frequent Contributor
Posts: 1848

Loc: Lake George, NY
Reg: 11-11-15
02-19-17 06:15 PM - Post#2677515    
    In response to Randyd

Engine off, if you step down hwrd on the brake pedal, then start the engine, does the pedal drop some?



 
Randyd 
Forum Newbie
Posts: 16

Loc: w washington
Reg: 03-23-10
02-20-17 12:29 PM - Post#2677636    
    In response to Shepherd

Yes, it drops about 1/4 inch. That part of the check from CPP, which it passed. Randy



 
Shepherd 
Frequent Contributor
Posts: 1848

Loc: Lake George, NY
Reg: 11-11-15
02-20-17 05:47 PM - Post#2677690    
    In response to Randyd

Are you sure the mc is properly sized for disc/ drum and power? Same for the combo valve. Usually if all else is right, the mc bore size can be wrong, a!ong with the pedal ratio..my 51 disc/ drum conversion, 7"dual diaphragm booster using a disc/disc, 70's Vette mc and matching combo valve, with a 10# rear residual valve, stops great with normal pedal pressure. Btw, mc has 1and1/8 bore size.



 
Rick_L 
Honored Member
Posts: 27651
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
02-20-17 06:57 PM - Post#2677708    
    In response to Shepherd

My 67SS had factory power drum brakes, 9" single diaphragm booster, and a 1" bore master cylinder.

When I changed to discs using factory parts, I retained the 1" bore master cylinder. Works great, lots of boost.

You might consider a 1" master cylinder if you have 1-1/8", but I doubt it would solve your whole problem.

Just as a cross check, go to mpbrakes site and look at their power brake troubleshooting guide. I'm sure very similar to the CPP troubleshooter, but maybe they say something or recommend something that's not said at CPP.



 
Randyd 
Forum Newbie
Posts: 16

Loc: w washington
Reg: 03-23-10
02-20-17 08:47 PM - Post#2677739    
    In response to Rick_L

Checked with msbrakes troubleshooting, CPP is more complete. My system has a metering value with the porportion value. Every brake site says 1 inch should be right with disc/drum. Guess I'll keep looking. Thanks for the impute. Randy



 
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