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I have a Troy Bilt Bronco 13yx78ks011 and the brake rod doesnt have enough throw to engage the brakes. It's almost like the brake rod that connects to the spring on the caliper is too long. I did notice that its hanging down below the frame. Theres nowhere to adjust it and nothing is bent. Its like the spring needs to be about half its length, but it doesn't look stretched out.

Any ideas?

If you set the parking brake, is the spring tight? If not the spring has stretched. Not uncommon on an eleven year old unit. If it is tight your brake pads are probably worn out. You might try tightening the nut on the brake assembly. Here is a parts breakdown showing where the assembly is located. https://www.jackssmallengines.com/j...odels/13aj771g231-2009/transmission-918-04566

The spring seems tight no matter the position of the brake pedal. The problem is that the rod is too loose amd theres no apparent way of adjusting it.

I’m sorry, but I can’t understand how the rod can be loose if the spring iis stretched tight. The rod puts the tension on the spring. Push brake pedal down, rod is pulled forward tightening the spring, pulling the brake arm.

Yeah, my fault. I mean that the spring is tight wound to itself. An extension spring thats not extended.

If that picture is with the parking brake engaged then I am thinking the problem isn't the spring or so much the rod as the rod isn't connected to the pedal rod. Item 53 connected to its slot in item 4

Yes. It's connected correctly. Sitting in the slot like it should. It just seems like the rod is too long. When the parking brake is engaged, there's not enough throw to move the rod. But there is also nothing to adjust it.

You will have to find an assistant and do what the techs have to do when they get into this position. With the unit jacked up like you have it, you will have to crawl under the unit and watch what happens while your assistant applies and releases the brake pedal. What you are looking for is why the brake rod is not being pulled fully forward. One thing I have found in the past is the bracket which the rod is installed will crack and bend back, not allowing the rod to move fully forward.

Here's a video.

Only conclusion is that either the spring or the rod is too long.

Unless someone has replaced the rod or spring I doubt either are too long. Did you check to see if that slotted bracket is properly welded to the shaft? The rod should be fully back in the slot when the brake is off.

What you see in the video is the system at rest, brake off. Then I press the brake.

I don't see any broken welds on the shaft. Everything on that side of things is secure it moves with the brake pedal as it should. The rod is just not sitting where it's supposed to and I don't know why.

Check the area where the brake pedal is attached to that cross shaft. I’m betting something is wrong somewhere along that shaft. Bent rod, cracked weld, twisted shaft, etc.

Is it an optical illusion or is the front of that transaxle tipped down in your first picture. Just looks tilted forward like the front support bracket has either broken or came loose.

Rivets said:

Check the area where the brake pedal is attached to that cross shaft. I’m betting something is wrong somewhere along that shaft. Bent rod, cracked weld, twisted shaft, etc.

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I just don't see anything unusual. All the stops are interfacing with their counterparts where they should. The pedal is where it should be at rest. Parking brake lever works and holds the shaft. It's all one piece. No welds are broken.

I guess maybe the rod has bent at the 90 somehow, but even that looks fine.

ILENGINE said:

Is it an optical illusion or is the front of that transaxle tipped down in your first picture. Just looks tilted forward like the front support bracket has either broken or came loose.

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illusion. transaxle is securely bolted in place.

I suppose my next option is to completely remove the brake/drive pedal assembly. I don't know what else to do.