Vacuum pump for Unified Tow Brake
I have been using the US Gear Unified Tow Brake in my last two tow vehicles, and now want to install it in a third. Unfortunately, it seems as if the vacuum pump has failed: testing the system befor...
Forum Discussion
Hello,
Your post is a little old but nobody has posted any replies and maybe you still are looking for input on this so here goes. I just installed a used UTB-1000 brake on my toad and did a little testing. I think you could find a stock automotive brake booster pump. I checked the vacuum on my pump and got about 15" of vacuum. It took about 3-4 seconds to pull it to the max (would vary on the size of your toad brake booster and capacity of the pump you found)and it held it after the pump shut off with no leakage. The pump inside the black plastic case acording to the label is a Geman made electric motor and a small plastic piston pump on the end. The label was hard to read but it looks like 12vdc and 2.1amps. There is no electrical control in the pump itself. If it gets 12v it runs. The power module supplies 12v to the pump and the solenoid at the same time on a single circuit. The reason the solenoid turns off before the pump is that it is controlled by the power module through the ground wire fron the solenoid back to the power module. The pump ground just goes direct to the frame of the toad. Over load of the power module shouldn't be a problem if the new pump draws somewhere in the neighborhood of 2amps. Judging by the size of the wires the solenoid draws way more current than the pump. There was some troubleshooting information on the Unified Gear web site that would help you tell if there may be a problem with your solenoid or power module. If you find a suitable replacement I would me interested to hear in case mine goes bad.
Your post is a little old but nobody has posted any replies and maybe you still are looking for input on this so here goes. I just installed a used UTB-1000 brake on my toad and did a little testing. I think you could find a stock automotive brake booster pump. I checked the vacuum on my pump and got about 15" of vacuum. It took about 3-4 seconds to pull it to the max (would vary on the size of your toad brake booster and capacity of the pump you found)and it held it after the pump shut off with no leakage. The pump inside the black plastic case acording to the label is a Geman made electric motor and a small plastic piston pump on the end. The label was hard to read but it looks like 12vdc and 2.1amps. There is no electrical control in the pump itself. If it gets 12v it runs. The power module supplies 12v to the pump and the solenoid at the same time on a single circuit. The reason the solenoid turns off before the pump is that it is controlled by the power module through the ground wire fron the solenoid back to the power module. The pump ground just goes direct to the frame of the toad. Over load of the power module shouldn't be a problem if the new pump draws somewhere in the neighborhood of 2amps. Judging by the size of the wires the solenoid draws way more current than the pump. There was some troubleshooting information on the Unified Gear web site that would help you tell if there may be a problem with your solenoid or power module. If you find a suitable replacement I would me interested to hear in case mine goes bad.
