Projects 1963 Buick LeSabre

im keeping the drum/drum system for now! as its a budget build and my first ever build lol

i drove it for 2-3 months with no issues and now the booster went bad

replaced shoes all around , got my self this new dual master cylinder and booster

https://ebayvehicle.com/app/31PS

i bench bled the master cylinder and bled the entire brake system about 2 times lol

i tried to connect everything like the original system

so i blocked the two left sides with plugs and connected the one brake line onto the new master and connected my original sensor

my vehicle has one brake line connected to the master and goes down connected to a Tee line

and well i thought i was good but im still getting spongy brakes ! pedal feels nice and firm as it should but as soon as i turn the engine on it goes completely flat!

not sure if i forgot to add something ? not sure if that proportion valve i believe it’s called was supposed to go on ?

 

Before the moderators kick you off the board we don't do frigging LS anything on this board. Read the rules.

 

sorry thanks for that you’re right! i’ve gone through them now ! just trying to get these brakes resolved by the new year lol

 

post a picture of this...if means what I think it does, I would not expect your brakes to work.

(hint: you have to connect one of the master cylinder connections to the front brakes, and the other to the rear brakes. Yes, it takes work to redo the brake lines, and if you can't do it yourself, you might need to get some help)

 

yeah, that's what I thought.

Either keep a single master cylinder, or change the lines so one goes to the front, the other to the back. And make sure there's enough travel with the brake pedal, to make the master cylinder get it's full travel. This can be tricky, and you can test it by opening a bleeder and see if the brake still work. If you dont' do this, you're probably better off with a single M/C.


and when you get the hydraulics working, you'll find that the little 8" booster doesn't work for your large car, either.

 

thankyou for that info !!
even tho i just street cruise the car? never go above 60mph? i should be fine or i shouldn’t even risk it ?

 

Uh...you need to be able to stop the car.

 

Listen to the guys. Fix it right and be safe. There is a Off Topic Hot Rod and Custom forum - perfect for your LS -
Welcome to HAMB
You might ask for info on what booster to use etc.
Dan

 

thankyou for that !!