Wheel Lock Up

[Diamondpilot]

If you do not have one already I would invest in a (back-up lock-out solenoid). I put them on all my boat trailers. You can get them for $35 at any marina or online. Its simply a solenoid that mounts somewhere between the master cylinder and the first brake in the circuit. 9 times out of 10 they are threaded right into the outlet port of the master cylinder and the brake line. It has a single wire that hooks up to a 7 pin round plug, center pin, and blocks the flow of pressure when backing up via a signal from the reverse lights, center pin.

Kodiak Solenoid Valve for Reverse Lockout - Normally Open Kodiak Accessories and Parts KBASV-O

Chris

 

[Mace Canute]

He didn't explain why that wheel locked up solid.

It could be that the inner lining on the flex line to the wheel brake cylinder has come loose and folded over on itself. Pressure will pass fluid one way but then it acts as a one way check valve and prevent the fluid from flowing backwards when you release the brakes. Sometimes it's an intermittent thing, sometimes it happens every time. I've seen it do just the opposite too where it prevents a brake from actuating.

 

[Diamondpilot]

I had just this very thing happen on a boat trailer in 2008 Pain to track down.

Chris

 

[oldballs]

It could be that the inner lining on the flex line to the wheel brake cylinder has come loose and folded over on itself. Pressure will pass fluid one way but then it acts as a one way check valve and prevent the fluid from flowing backwards when you release the brakes. Sometimes it's an intermittent thing, sometimes it happens every time. I've seen it do just the opposite too where it prevents a brake from actuating.

Thanks, Mace. That senario sounds "far out"! But the next time this comes up, I going to replace all those rubber(?) lines. I should have done it the last time I was under there doing maintenance. Cheers.

 

[Diamondpilot]

Thanks, Mace. That senario sounds "far out"! But the next time this comes up, I going to replace all those rubber(?) lines. I should have done it the last time I was under there doing maintenance. Cheers.

Its not as far out as you may think. I have seen it a few times and like I said it drove me nuts 2-3 years ago on a boat trailer. I had replaced every possible part and had it apart numerous times before I figured it out.

I have also seen it on fuel lines. Ethanol and Bio-Diesel can break down lines internally and it will look like a new fuel line on the outside. I have a Craftsman riding mower with a Kohler Engine this happened to and I have seen it on a few older Diesel tractors running as little a 5% blend of bio-diesel.

Chris

 

[Mace Canute]

Not only that Diamondpilot, it can also happen on your tractors' hydraulic lines. I wonder how many people have trouble with their loader and everything they check says it's just fine but they have a problem raising or lowering or curling the bucket. Remote cylinders can suffer the same problem. Heck, it applies to anything that uses hoses and fluids. It's not common but it's not exactly rare either!