Still tinkering around with the rear end/disc brake swap for my truck. Finished up the emergency brakes recently and bled the brakes but I have no pedal pressure. I bled them twice now with no success. Any ideas on the cause?
Make sure the bleeder valves are at the top of your calipers or you will get air pockets trapped in side. If they are at the bottom then you probably have the calipers backwards, (left on the right Ect.) If the bleeder valves aren't strait up but you think the calipers are on the right way you can remove them from the mounts and put a block of wood between the pads then hold the caliper so that the bleeder valve is strait up and bleed them that way. Also I hope you used a proportioning valve, if not you will probably have a problem with the rear brakes wanting to lock up. I used a adjustable valve on mine to get the right pressure combination. I hope this helps.....Big Tim
I believe it's the mc. I'd used a vaccuum pump to bleed the lines. Had my son the pump the pedal last night while I checked the bleeder and got nothing. I had changed master cylinders right before I started the rear end swap. It's the same type I had before (corvette style) that I swapped ou because I came across this one that had a proportioning valve already attached. It's a new unit that I got from someone who had purchased, then went another route. Can't swap the proportioning valve to the old mc because they use different size lines.
No Fluid Transfer Remember to re-adjust the M/C push rod so it has a bit of freplay when the pedal is released ~ the brake pedal *must* return to the toe board with a thump and the clevis pin should rattle if you shake it .
Found the problem! I disconnected the MC from the booster and compared it to the other one I'd removed. The pin on the booster was too small and not making contact with the plunger when the pedal was depressed. I changed the screwand added a washer that was large enough to make contact to the plunger and the problem was solved.
Did you bench bleed the MC first before you installed it? I'm not sure what you have done and I don't want to insult you but let's start at the beginning. #1 fill the MC with brake fluid then disconnect the lines at the MC and wait until fluid starts to run out, you don't have to pump the pedal just wait. After it starts to run out reconnect the lines. #2 Now have someone pump up the pedal then crack the lines at the MC and bleed them. #3 Now go to the farthest wheel away from the MC which would be the right rear and bleed the caliper then the left rear, right front and left front. you might have to crack the lines at the MC again and check for air. Make sure you check the fluid in the MC and it stays full. I'm assuming the MC is still located under the floor board, if so bleeding the brakes can be difficult. Something to watch out for if the MC is located under the floor board is it will be installed backwards and your brake lines have to be installed accordingly. What I'm saying is your brake line for the front brakes will be installed at the rear of the MC and the rear brake line will be installed at the front of the MC. This will keep your line configuration the same as it would be if the MC was turned around and installed on the firewall. If it's not done this way your rear brakes will engage before your front brakes. I hope this info. helps, keep at it you'll get it.....Big Tim
LOL! Yeah, I took it out for awhile Saturday. The ride was rough due to timing and carb issues but it was still a blast! Gotta adjust the trans, adjust the timing & carb and front end alignment and I should be good. Couldn't work on it too much because it was my wife's birthday and I didn't want to sleep in the truck that night!!!
Well... They both have curves~ Glad you've been out and about in it! It must be a great feeling to know you are rolling along in something you pretty much built by hand, huh? Way to go, Robert! Good luck with the loose ends!
