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| | | | Joined: May 2005 Posts: 82 Wrench Fetcher | | Wrench Fetcher Joined: May 2005 Posts: 82 | So here's the story:
I have a'49 3100 that I am trying to convert to power brakes. I installed a braket kit from CPP with the recomended Mustang master cylinder & booster. I also installed the 1/2 " extension to the pedal linkage. I am using the stock pedal with the under cab mounting along with the stock 11" drums front & rear. I did install a 10 # check valve in the m/c since the m/c is for a disc / drum combo.
Now the problem. The pedal goes down about 4" before the brakes engage. Ive got the brakes adjusted to a slight drag, the system has been vaccume bled etc.
I'm at a loss to solve this problem. Any ideas ????
Thanks.
1949 chev 3100 3 window. 350hp/327/m21 4 spd, 12 bolt rear, power brakes, 3" dropped axle from Sid's. Disc brakes next.
| | | | | Joined: May 2005 Posts: 1,624 Shop Shark | | Shop Shark Joined: May 2005 Posts: 1,624 | Did you adjust the length of the rod that exits the booster and pushes the piston on the M/C? Too short and you have your problem. Too long and your brakes wiil drag. I believe the correct gap is around 1/8". There is a handy tool to set the gap. It looks like a "H" with a rod running thru the crossbar.
You didn't say, but did you install 2lb. valve in the front brake line?
Edit, Apache Fiend: I missed the drum/drum combo. If so, forget the 2lb. valve.
Last edited by beltfed; 08/12/2012 8:52 AM.
Six volt guy living in a twelve volt world
| | | | | Joined: Apr 2005 Posts: 177 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 177 | adjust the rod from the pedal to the power booster. i had to turn mine out about 1/2" to get a good pedal off the floor | | | | | Joined: May 2005 Posts: 487 'Bolter | | 'Bolter Joined: May 2005 Posts: 487 | What Mustang MC and booster did CPP recommend?
regards,
Leon | | | | | Joined: Dec 2005 Posts: 547 'Bolter | | 'Bolter Joined: Dec 2005 Posts: 547 | If I understood your post correctly, you are using a disc/drum MC with a vehicle that has drums front and rear.
If I'm not mistaken that isn't going to work. You need a drum/drum MC.
58' 3200 235 3-speed/OD
| | | | | Joined: May 2005 Posts: 487 'Bolter | | 'Bolter Joined: May 2005 Posts: 487 | I'm working on a 57 3100 and have a similar problem. I'm using the CPP 5559MCA bracket and a 69 C10 drum/drum M/C (#1329). Mine is a non-boosted setup. It seems like the pushrod that CPP supplied isn't long enough. I haven't done a trial fit in the truck yet, but it looks like about 4" of slack, same as the OP.
regards,
Leon | | |
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