Sometimes you have a workday where everything seems to fall in place and work correctly, and sometimes you finish the day where it feels like nothing was accomplished. This weekend was mostly the latter. I spent just about the entire weekend on the brake situation in the Travelall, and as of right now I still don’t have anything to show for it.
I started by doing a short test run to get the truck warm, and then brought it back to the driveway to check the drums. The driver’s front was the hottest, so I put the entire truck up on stands and pulled all four wheels. Each drum was warm to the touch and didn’t spin freely, which told me they weren’t releasing properly. So I bled them starting at the far corner with my daughter’s help, put the wheels back on, dropped it onto the ground, and did another test run.
After the second run the drums were still hot, which pointed to a possible problem with the master cylinder. When I originally replaced it, I bled it on the truck instead of the bench (rookie mistake), so I figured maybe there was air still trapped in the cylinder. I rigged up a bleed tube, disconnected the brake system, and bled it out again. I did get some air out of it before it went clear, so I figured maybe I was home free. After dropping it back on the ground, I bled it at the wheels again and prepped it for a test run.
Sunday morning I took it back out for a drive, and back in the driveway I found that the driver’s front drum was still hot to the touch. This was frustrating, but I kept my cool. I figured I would replace the only two elements that still exist from the original brake system: a long hardline going from the prop valve to the rear axle and another going across the front of the frame to the passenger front wheel. As I’ve bled the system the fluid has been coming out dirty, so there’s a good chance there’s some crud in those lines that isn’t letting the pressure release.
I tackled the long line first, and was lucky to have just enough left to reach— it’s 9 feet in total—so I ordered another length of 1/4″ line from Prime and got to work heating and cooling and heating and cooling the fittings. The rear fitting came out relatively easily but it took an hour of patiently working on the front fitting before I felt brave enough to put a wrench on it. While that was happening I pulled the old line off and used the needle-scaler to remove surface rust on the inside of the frame rail behind the mounting points, and hit it with Rust Encapsulator. Then I put the new line in place, double-flaring the ends, and tidied up the wiring on that side.
Up at the prop valve, I decided to split the line and slide a box-head wrench up to the nut so that I was getting all the contact area possible, and then with one mighty heave, it came loose. After that it was relatively easy to double-flare the other end and tighten it on the valve.
By this time it was getting dark, but I worked until about 8PM heating and loosening the nut on the other side of the valve and pulling all of the retaining clips off of the frame. While I was under the truck I tidied up the wiring on the passenger side and found that when I’d re-connected the gas tank sender wire I never covered it with anything (there was an unused section of heat shrink tube on the wire, so I had all the best intentions) so I cleaned those connections for testing later.
The front line is going to take hours, I suspect. It’s in a difficult location to get to. The end of the line is mounted up on the frame behind the tire, right next to the starter, so there’s little room to move. I suspect I’ll have to remove the starter and spend a lot of time heating and juicing that line as well.
If this isn’t the issue, the way I see it there are only two things left that could be the problem: the short soft line going from the master cylinder to the prop valve, or the master cylinder itself. I’m thinking I’m going to order the soft line just to rule it out (it’s pretty cheap in any case) before spending $80 on another master cylinder, just to make sure I’m not firing the parts cannon prematurely.