1969 K5 - little to no brakes

[fear_nothing]

1969 K5 - Disc brakes in the front / drum in the rear.

Been fighting a problem w/ my brakes for a while. Used the opportunity to replace the calipers and brakes up front. (OEM AC Delco) Ordered new hoses but they were too short. They probabaly need to be replaced, but aren’t cracked and don't appear to be leaking. I'm using a brake bleeder/vacuum pump to bleed the brakes.
* Passenger front doesn't want to bleed - I can build pressure w/ the pump but no more than 15-20 lbs. It leaks down moderate to fairly quick. Just enough time to open / close the bleeder screw
* Drivers side seems to bleed fine. It builds 20+ lbs and slowly leaks down. More than enough time to open / close the bleeder as needed

4 month ago I also replaced my carb. For reasons I can't remember I also replaced the vacuum hard line. This would be the screw in hardline that goes from the back of the carb over to the master cylinder booster.

There is a very small hint of brakes if you stand on the pedal. The pedal feels normal & not spongy. Drove it around today in my pasture, and based on the tire marks - the driver’s side front is working based on the skid marks.

What do I need to be looking at?

 

[Wes Harden]

It seems there is a restriction some where. I would wait till the hoses are done. Old brake hoses are always suspect, imho.

 

[fear_nothing]

Try removing the master cylinder cover and cracking all the bleeders. Mine will self bleed without pumping the pedal.

Good idea, just tried it...nothing out of either side

I don't have a massive lift, about 4". Most of the brake hoses I'm seeing seem too short. I'm looking for a 24" braided hose I guess

 

[Wes Harden]

I used the ORD set. I'm a little confused about the id of 16mm you mentioned in previous post.
I don't recall seeing anything other than 7/16" and 10mm.
A hydraulic shop in near you should be able to make longer copies of your hoses, remove them for samples

 

[fear_nothing]

I used the ORD set. I'm a little confused about the id of 16mm you mentioned in previous post.
I don't recall seeing anything other than 7/16" and 10mm.
A hydraulic shop in near you should be able to make longer copies of your hoses, remove them for samples

I went with this set as they deliver tomorrow. After reading it again, I have my doubts on wheather or not it will be long enough.

16 mm was in ref to the bolt that fits in the area denoted w/ the arrows.

 

[fear_nothing]

Finally some progress. Got the drivers side hose replaced (braided line) Finally have fluid flowing out to the caliper.
-As someone mentioned it was started to "self bleed" out the bleeder screw after everything was connected
-Ran out of daylight, energy & had my fill of humidity for the day.
-Tomorrow we will see what challenges are in store for the passenger side

 

[Wes Harden]

Ahh I got ya now fyi 16mm and 5/8" are the same. Finding size for the frame mount is pretty much standard. Glad you are making progress. cut open the old line and look inside.

 

[fear_nothing]

Drivers side is working. Don't have the hardware to fix the passenger side. Is there a standard thread size on the brake hard line? I need an apapter to connect the braided line to the hard line.

 

[fear_nothing]

Since pictures help, this is what a guy is trying to connect.

 

[bp71k5]

Since pictures help, this is what a guy is trying to connect. View attachment 418584

There should be a fitting that goes through the frame that joins those.