brake line to mastercylinder question.

[madbiker4]

I just got done running new lines and installing my new booster and mastercylinder. I routed the new lines just like the old ones, the front line going to the front (small resivoir) of the master cylinder , and the rear line to the rear ( large resivoir) of the mastercylinder. this didn't realy seem right to me but I went ahead and routed it that way anyway. after I bled the entire system I tested it, and the rear brakes are completely locking up before the front. I have to push the pedal about twice as far for the front to even begin to lock up on gravel. did I route the lines wrong? I'm thinking the front line should be run to the large resivior and the back to the small one. any thoughts on this? thanks in advance

Oh, forgot to mention that I have front disk rear drums.

[Bullitt390]

The big (rear) chamber is for front brakes.

Josh

[fordman]

yes the master is backwards from what you think it might be. the front goes to the back resivor and the back goes to the front resivor.

[kaptnkaos]

Yep... the larger one (rear reservoir) is for the front brakes

I picked up my new master cylinder last week to do the same thing.
It is exactly the same as the one I removed... it has two reservoir that are the same size.
The brake lines that attach to the MC are different different sizes.
Is having the same size reservoir, going to affect the braking ??? or should I order another one.

KaptnKA S

[Bullitt390]

I picked up my new master cylinder last week to do the same thing.
It is exactly the same as the one I removed... it has two reservoir that are the same size.

Usually equal chambers are used for drum/ drum or a disk/disk set-up.

Josh

[kaptnkaos]

Hey Bullitt390.

Yeah, mine's a drum/drum set up. When I ordered the replacement for the '68 CS from NAPA, I was told that they no longer made an MC that had the same size reserviors.
The first one I got had a large rear reservoir and a smaller front one.
The threads for the brakeline fittings were stripped out so the fitting would cross thread.
I didn't want get that one, so I had them send it back and send another one.
The 2nd one they sent, was the kind that they supposedly didn't even make anymore...

KaptnKA S

[madbiker4]

I went ahead and switched the lines around, everything is working tip top now. thanks for your help.

[kaptnkaos]

Right on madbiker4

Glad you got it fixed. I'm right in the middle of doing that myself.
I broke the line that goes to the rear brakes, They are the original lines and it looked like it was corroded from the inside out, so I am gonna replace the lines from the the MC to the proportioning block.
The only problem is that I can't quite get to the lines, and they are twisting I don't want them to break off in the proportioning block...
How did you remove the lines ?
Are there union fittings on the proportioning block, or do the lines thread directly into the block ?

KaptnKA S

[madbiker4]

the lines thread directly into the block. I used a brake line wrench, it looks like a boxed end wrench but with a slot at the end to slide it over the line, kinda like a crowsfoot wrench.I would recommend using these ( you'll need several sizes) as I have never had one slip on the fitting. the lines aren't that hard to get to if you crawl up underneath to get to them, you just have to be careful about getting fluid in your eyes.